I'm not sure if a bad battery could cause a bad idle, but it CAN cause a car to quit running. After it was replaced, I noticed the car was shaking in idle and on gear, very little on gear 1. A bad plug will also cause it to run rough and have a bad exhaust smell and cause the noise you are hearing at the tail pipe. A sticky/dirty IACV will cause rough idling. Ihave a 92 sc400 without about 130k miles. It is possible that old gas can cause a problem, your engine has no points either solid state ignition, a partially sheared flywheel key can cause a rough running engine too. Could This Be the Root Cause of Rough Idle? EricSilver: Tech Help: 14: 10-16-2003 07:51 PM: 240D rough idle - Do I or don't I have rack damper bolt? JohnnyJ: Diesel Discussion: 8: 10-08-2002 08:44 PM: Rough start, rough idle: jchip: Tech Help: 1: 10-06-2002 09:12 PM: 400E rough idle problem finally solved: carman850: Tech Help: 1: 04-19-2002 07. if it is not making a steady tick or no tick that inj. Have a 2013 XC. I changed out a leaking water pump and put on a new timing belt in the process and now I'm trying to troubleshoot a slow rough engine idle and a bog/hesitation when accelerating during a test drive. The idle may still be higher and the mixture enriched, but the ECM is using the O2 sensor. Loose alternator belts also cause automotive components to work harder in order to compensate for voltage fluctuations. The most common cause of rough idling would be a bad or clogged fuel injector. It can be caused by: Worn serpentine belt (a frayed belt is about to fail completely) Worn pulley causing the belt to slip; Pulleys are loose and need to be tightened; A quick stop to the mechanic should easily clarify the cause of the problem. 8L engine that has an extremely rough idle. The engine seems to pull fine above 1400 rpm and is smooth to redline but it idles very rough and somewhat erratically. Whether a car has a timing belt or chain, neither is the cause of a rough idle. A misaligned cap can cause a rough idle and affect driveabiity. If the timing belt or chain has jumped a tooth, the camshaft(s) and crank will no longer be lined up properly. Rough lumpy idle on 1987 NA I'm trying to chase down the cause of a rough and lumpy idle on my 1987 NA. Many times these. Bike started having a problem where it will randomly start idling and bouncing back and forth upwards of 400RPMs difference. The engine light is on and the idle is rough. Ihave a 92 sc400 without about 130k miles. especially after a swap. 16) Conduct a 'leak down test' on all exhaust valves. 1) Bad Spark Plugs. Also I can get it up to speed okay, but the car will. The idle may still be higher and the mixture enriched, but the ECM is using the O2 sensor. 05 Impala LS intermittent low/rough idle. Your Jetta's engine creates vacuum when running. These items are all important parts of what keeps a vehicle running. We wrote about something similar on the Prius, being a common cause of the MIL. In other words, take note of when your vehicle shakes during idle, as well as any sounds. If the hose comes off the engine will. Two Reasons for Rough Idling on a Ford Focus Vacuum leaks or a faulty DFBE sensor might be to blame. Many people probably have something out there for his but I'm just seeing what advice I can get. On those Lexus cars that actually have a timing belt, up to 2006 at least, the replacement interval was 90,000 miles or 6 years. If you have a 3mzfe, check / clean the MAF sensor as well. No it is not your serpentine belt. Below are the top 5 causes that a mechanic would look for. It can be caused by: Worn serpentine belt (a frayed belt is about to fail completely) Worn pulley causing the belt to slip; Pulleys are loose and need to be tightened; A quick stop to the mechanic should easily clarify the cause of the problem. If the vacuum system gets a leak, it will cause a shake when idle. some people seem to think that they are the first honda owners to have this problem. Ihave a 92 sc400 without about 130k miles. It's the crank fluctuation sensor that is located near the crank gear behind the lower timing belt cover. I changed out a leaking water pump and put on a new timing belt in the process and now I'm trying to troubleshoot a slow rough engine idle and a bog/hesitation when accelerating during a test drive. What process are you using to try to pull the codes up. Could also be IAC vavle malfunctioning. As I said the list is long. Like a piece of paper or anything with a straight flat edge. If the tachometer is rock steady, and the shaking seems worse in gear than out of gear, that's a pretty good indication of a bad motor mount. The serpentine belt is a critical part of this system, and once the engine is running, it continues to operate. I also only run Top-Tier gas. That makes diagnosing the root cause a challenge, especially if you aren’t sure where to look. It is also good practice to replace the water pump and tensioner pulley at the same time as they ride in the belt path and can wear. A bad fuel injector will either deliver more fuel or less fuel to the engine, or fails to operate at the right time. Its also easy to install. Bike started having a problem where it will randomly start idling and bouncing back and forth upwards of 400RPMs difference. How to Fix a Rough Idle or Stalling Car. An Auto Zone diagnostic test determined that there is misfiring in cyclinders 1,3 and 5. In September of 2011 it began to have the condition where it would sputter or stutter under acceleration and even. Even though your injectors are "spraying" they may be leaking and causing a VERY rich mixture at idle. If the tension is too high, this will cause excessive wear to the belt-driven accessories. 0 Lit The ODB read a alarm code miss fire. A strong possibility of rough idle at startup is a bad CHT. No it is not your serpentine belt. But then today, as I was driving down the road, my truck felt like it was bogging, so to speak. Coolant leak and rough idle. 5 years ago, and the cars had idle problems practically since I got it. The issue will eventually worsen as the pulley continues to wear. If the hose comes off the engine will. Verify that the timing belt is in alignment, (This will also cause a rough idle and sometimes stall at idle,and will run good off idle) Inspect the EGR valve for possibly being stuck open a little. A serpentine belt is the most common belt in today’s cars—it controls the functionality of most every system for your car. I also only run Top-Tier gas. Share When the DPFE sensor is failing or goes bad, it causes rough idling, a reduce in power, and it may cause the "check engine" light to come on. The Z airflow meters are very susceptible to turbulence and that can cause the idle to dip abnormally low and can even cause stalling. Drops in electrical output from a failing alternator can cause these systems to malfunction, leading to a poorly running engine. This article takes a closer look at three common causes of rough idle. A Bad EGR, the EGR is leaking and causes horrible idle speed misfire/stalling and flooding or spark plug fouling. I was wondering if anyone else has had this problem. The only things I have tried so far to fix the problem is change air filter, spark plugs and clean throttle body but none of these things have solved problem. and drive belt quickly. Also I can get it up to speed okay, but the car will. I have checked cleaned and rechecked everything and still the car has a rough idle and when accelerating out of 1st gear and every gear after the motor cutss out boggs down and has ZERO power but car doesnt stall when i take foot off pedal power comes back. The remainder is so you can remove the rocker cover. Depending how bad the gap was on the plugs, that may have been part of the issue also. But when I put it in neutral or park, it lessens. My car has been idling very rough. A headgasket will cause a rough idle until the car is warmed up because the heads are moving on the block. lack of power, rough idle. Anyways, I went and replaced the timing belt, water pump and oil pump. So I was getting a vibration at idle when in gear sometimes, usually when the engine was cold. Tap end of plastic cap on flat wooden surface to seat cap properly at base. Causes of Car Vibrations When in Idle Mode. if it is not making a steady tick or no tick that inj. Avoiding a drive belt repair can cause much bigger problems. 17) Check for Oxygen (O2) sensor function tests. Had a hard time starting and threw a cel. Nothing worse, nothing better. This will result in squeaking sounds and idle vibrations. The change is not super apparent. The issue will eventually worsen as the pulley continues to wear. The last time I had it done was while one of the tensinoners on the alternator belt was being replaced about 15K miles ago this past summer. If the cause of the rough idle is an engine misfire, a mechanic may start by replacing the spark plugs or fixing a vacuum leak. Already searched existing threads and, though people had rough idle problems, none helped me out. Plugs are new, leads are new. The effect of a vacuum leak is more noticeable at idle, when the air flow is lower. It needed head gaskets, timing belt etc. However, if the engine is running rough and then throwing the code, it is typically not the fan belt(s). These can include the alternator, air conditioning compressor, power steering pump, and power brakes. If too much air gets mixed in with the fuel, it will cause your engine to misfire. In more serious cases, the bearing, or pulley itself may wear out to the point of breaking or cracking, and coming apart, or seizing. Nobody does this, even at the audi dealers. I dont see it as much on the 2. They might offer to fix it then and there, but you can save yourself money by fixing it yourself. but if I keep the car above 1k rpm it idles fine (IE: running the AC) Any help with this would be helpful. The first thing I would do would be to clean every contact you can find between the alternator and the battery & then all the ground connections from the. Anyways, I went and replaced the timing belt, water pump and oil pump. The idle is rough enough to feel the car shake. 7 I5 with 120,000 miles on it. If it's broken or leaking, it can cause an imbalance and create high idle. Or your timimg belt. The cam sensors can indeed cause rough running, hard starting and stalling. The N*'s have a problem with headgaskets because the engine is aluminum, the head bolts have a tendency to back out or crack, my engine block had to have all 20 headbolts retapped. A common concern DIY Toyota and Lexus owners call CARspec for is a rough idle, starting and dying, or a hard start just after replacing or disconnecting the 12 volt starting battery. I have checked cleaned and rechecked everything and still the car has a rough idle and when accelerating out of 1st gear and every gear after the motor cutss out boggs down and has ZERO power but car doesnt stall when i take foot off pedal power comes back. It runs very rough at idel and at take off it kinda shutters at first untill it gets going. Back in the summer of 2011, the idling had gotten so bad that my car would stall in traffic, at stop signs, stop lights, drive thru. you should be able to pick up on which one is bad. 5 is better. Engine Misfires; Perhaps the single most common cause of rough idle comes in the form of a misfiring engine. Rough idle under cold start conditions could be a symptom of a more serious problem. This had solved the rough idle issue for me when the A/C is on. Last time I ran a code reader it gave me a random misfire code, I did an oil chance full symthetic and the oil smelled of gas so I am guessing that the fuel pump is bad but I'm not sure that would be causing the rough idle and Dieseling. So that problem is fixed. In addition to a warning light, a bad coil or spark plug can make the engine have a rough idle, misfire or surge. Vacuum leak symptoms. 2L) engine (30,000 miles) has a mildly rough idle (like little surges), that comes and goes from hour to hour of operation. Sorry for the late reply, hopefully someone else may be able to help with the rough idle. Replaced spark plugs, didn't find any vacuum leaks (going to pressure test today) Tried replacing coil packs No change. 15) Check all Vacuum lines. The more cylinders you have, the smoother your idle. I recently purchased a 2008 canyon with the 3. From the sound of things you likely have a miss-fire (yes if the valves are out of adjustment they can cause it), miss-fire will cause the blinking of the CEL and will cause the vehicle to drive with a lack of power. After it was replaced, I noticed the car was shaking in idle and on gear, very little on gear 1. Call to schedule an appointment today! As with many car issues, the root cause of a rough idle can either be a quick, easy, inexpensive fix, or it can be something more serious and costly. Many different problems could result in a rough idle for your car or truck, including: dirty fuel injectors, clogged air filters, bad spark plugs, and a variety of exhaust system issues. I bought it from my sister roughly 2. Jump to BUT it could also be the car is overheating from a bad water pump. No it is not your serpentine belt. Fortunately, a mechanic can often alleviate rough idling without much trouble. 16) Conduct a 'leak down test' on all exhaust valves. Sticking injector more than likely. 1993 Chevy Truck Belt Noise and Rough Idle. A car running rough can be tricky to diagnose. The N*'s have a problem with headgaskets because the engine is aluminum, the head bolts have a tendency to back out or crack, my engine block had to have all 20 headbolts retapped. Drain the fuel tank and fill it with fresh gasoline if the fuel is over 6 months old. Look on page 01-02B-72 for a long list of possible misfire causes. A bad throttle position sensor, on your 1991 Saturn, will cause the engine to run rough when it is idling. If none of those are your issue, the alternator is off your list. It may unstick itself after a while, or it may need to be looked at. I've had the wiring break before and would cause the car to idle super rough and have no power. Ok, the squeaking and rough idle can be one and the same, could also be two different things. I have a 2000 Accord with a 2. I like the manual timing belt tensioner theory. Other than that the car runs fine, there`s no check engine light no excessive fuel consumption, starts quick, drives smooth. First, however, they must determine the precise cause. In some cases with these functions, you can expect problems at higher RPM's also with a bad idle control valve. Open hood at night in very dark location, and see if you can detect a small, static like, snap anywhere. Did that mostly just so it was done as a. What could cause this rough idle scenario, is the compressor going bad? Or belt? Thank you in advance. So now it starts, rough idle when cold, stops when warm. He suspected it was a PCM going bad but and all it ended up being was a bad ground. The symptoms are as follows: severe vibration whenever the car comes to a stop (it seems to be related to the suddenness of drop in RPM) at idle with the gear engaged in 'D' (~600 RPM). Im at the point where Im going to drive it until I can figure out a way to fix it or it blows up, whichever comes first. If your timing belt is not properly tensioned it will not keep the valves timed properly to the lower end and this will cause misfires, loss of power, bucking, and could even cause a no start condition. When this happens, the engine's valves, which are powered indirectly by the timing chain, will no longer run correctly. Ihave a 92 sc400 without about 130k miles. The truck now has 105k on it. Posting my results in hopes it will help someone else down the road. The engine light is on and the idle is rough. A mild engine cylinder misfire may cause a rough idle. It can be so bad it can stall the car or cause the revs to hang at a bad moment for that. If none of those are your issue, the alternator is off your list. Bought new idle control valve which made it drop back to idle a lot quicker but still same rough idle. It may unstick itself after a while, or it may need to be looked at. While granted the valve clearance can have a minute affect on valve timing, the valve timing is generally affected by the timing belt and cam & crank alignment. Personally if I can figure out where that bad boy is, I'd like to reseat it first see if its jsut a bad connection, before I drop 70 bucks on a new one. The remainder is so you can remove the rocker cover. You may have to register before you can post: click the register link above to proceed. 85 I know some members have had cats go bad because faulty IPDM loaded them up with fuel. If this happens it can cause the idle characteristics to change. Yes, a bad belt or tensioner can be related to a rough idle. I had a guy tell me one time his truck was acting weird. So I was getting a vibration at idle when in gear sometimes, usually when the engine was cold. When this happens, the engine's valves, which are powered indirectly by the timing chain, will no longer run correctly. I can’t find any vacuum leaks. WOW what a difference. The car has 57,000 miles. 5 years ago, and the cars had idle problems practically since I got it. The symptoms are as follows: severe vibration whenever the car comes to a stop (it seems to be related to the suddenness of drop in RPM) at idle with the gear engaged in 'D' (~600 RPM). when in R and D with brake pressed idle is rough and vibrates bad. Replaced spark plugs, didn't find any vacuum leaks (going to pressure test today) Tried replacing coil packs No change. 8 Gas engine refuses to idle below 1500rpm. My car has been idling very rough. Back in the summer of 2011, the idling had gotten so bad that my car would stall in traffic, at stop signs, stop lights, drive thru. It controls your idle speed. So I got to thinking and wondering if a bad alternator could cause idle surge problems?? Anyone ever had that be the cause?? Also in the logs I've done I've been getting a few numbers that seem to be off. It happens whenever the car is stopped in any gear. That wouldn't cause clicking and a rough idle. Mass Air Flow (MAF) sensor is the cause of rough Idle/Acceleration 80% to 90% of the time. But when I put it in neutral or park, it lessens. The most problems I've only heard about the mounts have been vibrations within the drivetrain that you can feel at idle. If your timing belt completely breaks, it can result in major damage to your engine. As I said the list is long. Re: 1991 Rough Idle/Misfire Bring the bill to the Acura dealer and ask them to pay for the service. A high pitched noise from the timing belt usually means the belt is too tight. It's important that you positively rule out the ignition coils. i lost #6 cylinder compression recently on my procharged 98 and it idles the same way and shakes like a paint mixer. If it is not tight enough, or worn it is not able to run as smoothly as needed to keep the engine running smooth. Faster and Rough Idle after Timing Belt Change 09-14-2011 02:32 PM #1. A bad idle-speed control unit can cause the problem; it may need to be replaced. The only code I get is P0175 – fuel system too rich. When the valves begin to run off-sync, the engine will function poorly and cause the vehicle to have a rough idle. It will go to up a little over 1000 RPM's, and then go down, to the point it almost seems like it is going to die, and then go back up to. I have an 2001 gmc jimmy 4. But then today, as I was driving down the road, my truck felt like it was bogging, so to speak. It's not that old, and there are no adjustments on this carburetor skytronic, so don't look for any. i have had the same code take a big screw driver put the tip on the injector while the truck is running and the handle side on your teeth or ear and listen or feel the ticking should be at a fast steady pace tick tick tick, at idle. Its also easy to install. If any of these are bad, they would cause the engine to run rough. 9 m42 motor. Timing is correct. If it is, then I don't know what to say. Sometimes, the internals of this component can become dirty, affecting the closing and opening capabilities of the valve. Bought new idle control valve which made it drop back to idle a lot quicker but still same rough idle. ON the bugeye 2. If none of those are your issue, the alternator is off your list. Really, your Jetta will be running rougher at any RPM, but a misfire will be most pronounced at idle. The issue will eventually worsen as the pulley continues to wear. If a new CHT didn't solve the problem, check your fuel pump and fuel. As I said the list is long. 17) Check for Oxygen (O2) sensor function tests. especially after a swap. I do right now. 85 I know some members have had cats go bad because faulty IPDM loaded them up with fuel. A vacuum leak can be caused by a bad vacuum hose, intake manifold gasket, and other vacuum powered. the object to this thread is to make a some what of a check list of everything that can / has caused a idle issues/ surge and a mis fire i dont need the entire story, just what fixed the issue i have noticed latly there is a asssss load of threads about mis/rough idle. Even though your injectors are "spraying" they may be leaking and causing a VERY rich mixture at idle. ? All explain are approximative value. Bad timing can also cause. Damaged Motor Mounts Any damage to the motor mounts can cause the engine to vibrate and shake during idle or when stopped. The ECU now has default numbers in its trim memory - it has to adjust them to match the tune of your engine and its sensors and actuators. Driving with a bad belt tensioner (luxury, idle, best, Audi) User Name: Remember Me: Password the risk is that the tensioner will somehow cause the belt to dislodge, probably by seizing. Switched to 89 midgrade, and she's a totally different truck. The car runs significantly better and has no idle issue. I do right now. My dealer changed the fuel filter and then told me that my problem was a leaking valve cover gasket that had allowed oil to foul the plugs, ruin the plug wiring, and ruin the serpentine belt. Waiting for a code reader to be delivered tomorrow. 1990 mighty max 2. If the sensor is bad, it could cause too much fuel to be delivered, causing incomplete combustion which can lead to clogged injectors and carbon build up, which would definitely contribute to a rough idle. 05-07 is the problem years with chain guide issues. A misaligned cap can cause a rough idle and affect driveabiity. Intermittently, it will begin to stumble/shutter at low RPMS/Idle. Either of these conditions can lower the engine's efficiency and cause the "Check Engine" light to glow. Sometimes the EGR Valve, if you have one (in the area between alternator and valve pan cover and fastened to the block), can act up a bit and allow exhaust gases into the intake manifold at idle, resulting in a rough idle. When in idle it feels like the compressor is engaging and then the car shakes a bit and can hear the fan blowing real loud like a get engine for a few seconds. Yes, a bad belt or tensioner can be related to a rough idle. The Indy that did the belt is adamant that the timing is spot on, he showed me all the locking pins etc he uses. Ihave a 92 sc400 without about 130k miles. The car has had an issue with vibration for some time now. The grinding sound could be a tensioner pulley for the serpentine belt. Anyway, sounds like a problem with the idle air control (or whatever Subaru calls it). the rpms drop from a steady 7500 to about. Earlier symptoms include parts that are simply not working, from engine parts to belts and hoses. The rough idle is more uniform and reliable with a mechanical imbalance, such a bent pulley or bad harmonic balancer. The car runs significantly better and has no idle issue. The truck now has 105k on it. Replaced Camshaft position sensor, no change. In case of a timing belt, it's a warning sign of a soon-to-be timing belt failure which you should appreciate. Many different problems could result in a rough idle for your car or truck, including: dirty fuel injectors, clogged air filters, bad spark plugs, and a variety of exhaust system issues. Rough idle when cold also has many OTHER possible causes, too numerous to discuss here. At my rough idlewhich seems a little too low. Did that mostly just so it was done as a. temp sensor is used by the computer to regulate fuel/air mixture during start up. 5 volts, either the battery is weak or the alternator is not charging it properly. Another cause of high idle could be the air intake boot which delivers air into the intake system. What causes a car to sputter and idle rough? Car's engine that sputters and runs rough while idling is an indication of misfiring of one or more cylinders if the cylinders misfire the vehicle's engine balance will be disrupted. The bad cylinder wouldn't be as noticeable at a higher rpm as the other cylinders almost compensate for it. This will result in squeaking sounds and idle vibrations. If the issue stems from a clogged fuel injector, the mechanic may need to clean or replace the fuel injector, depending on the extent of the damage. Removing this slack on one side of the chain also causes the cam sprocket (3) to rotate and change camshaft timing on that bank. If it’s too loose, then the belt will slip, and you won’t have alternator power, likely the cause of your problem. The engine light is on and the idle is rough. This may also cause a bad effect on the sensor itself. In many high-mileage cars, oil leaking into a combustion chamber from worn valve seals and oil rings can foul spark plugs causing misfire; often an engine misfires at idle, but runs better after revving up. 8L engine that has an extremely rough idle. 0 engine this was very common. Really, your Jetta will be running rougher at any RPM, but a misfire will be most pronounced at idle. Timing Belt. A bad plug will also cause it to run rough and have a bad exhaust smell and cause the noise you are hearing at the tail pipe. Even though your injectors are "spraying" they may be leaking and causing a VERY rich mixture at idle. that's the hill billy way to check injectors. I have a 2002 Legacy 2. A failing O2 sensor is sending oxygen to the fuel at the wrong time, causing the misfire. If the timing belt or chain has jumped a tooth, the camshaft(s) and crank will no longer be lined up properly. 2005 pt cruiser 2. I would be looking for things like bad ignition wires, coil pack, vacuum leaks or improper connections. Carry out a fuel pressure check with the engine at idle and then ten minutes after switching the engine off. Yes, a bad belt or tensioner can be related to a rough idle. Other than that the car runs fine, there`s no check engine light no excessive fuel consumption, starts quick, drives smooth. The Z airflow meters are very susceptible to turbulence and that can cause the idle to dip abnormally low and can even cause stalling. Timing Belt/Chain. 5 w/141,000 Timing Belt replaced at around 100,000 Catalytic converter was changed last year. Well I'm pretty sure I already know what's causing my rough idle, just that one injector ring, but just thought I'd ask, everything else seems to be ok, and my idle isn't really that bad, just a little bit rough because it's sitting at about 500-600rpm instead of the usual 750-800rpm. I have checked cleaned and rechecked everything and still the car has a rough idle and when accelerating out of 1st gear and every gear after the motor cutss out boggs down and has ZERO power but car doesnt stall when i take foot off pedal power comes back. I also noticed that during idle sometimes not always turning on the A/C will cause a very similar rough idle. The vibration is quite noticeable in the steering wheel. Left the service and got same problem just after 1/2 mile. Just bought a 04 Commodore SS. Step 3 – Bad intake air control valve (IACV) The IACV is a common point of failure for the 1992 to 2000 era of Honda Civic. A loose alternator belt will affect the alternator's performance and will lead to automotive electrical failures, such as dead or weak batteries, dimmed headlights and engine stalling. Just wondering what the cause of a rough idle only when the Outback is in gear and at a stop. So here's whats up: I have a 2001 Chrysler T&C 3. If the coolant sensor reads warmer than normal, or reads hot all the time; the (PCM) will lean out the fuel mixture too much, causing the engine to stall when it is cold. See if your idle is actaully increasing when u turn on the a/c. We decided with the mileage to do a timing belt. NOTE: Mazda has an updated EGR valve for this vehicle, Part # BP4W20300A9U, (although it list for $291. A low or rough idle on a Air Flow Meter style engine can be cause by any vacuum leaks in the intake. No more rough idle. When I start the car it is idling good. At my rough idlewhich seems a little too low. One good missed shift or over rev and it can cause it to jump. The belt tensioner spring or "idler" pulley going bad could give you issues like this. It controls your idle speed. It will go to up a little over 1000 RPM's, and then go down, to the point it almost seems like it is going to die, and then go back up to. These mixed signals will cause the rough idle that you talk about. LS1 Belt Tensioner Chatter. The source of a vacuum leak can be one of many things. The van had no misfires or check engine lights prior to new timing belt installation and ran well. Below are the top 5 causes that a mechanic would look for. After a change you must reset the fuelling with the engine warm and consumers on via the diagnostics. A burnt exhaust valve can be $3K worth of damage. Below are the four most common. DO you think this is the cause of the rough idle? The idle is kind of weird. Call to schedule an appointment today! As with many car issues, the root cause of a rough idle can either be a quick, easy, inexpensive fix, or it can be something more serious and costly. A mild engine cylinder misfire may cause a rough idle. I'm not sure if a bad battery could cause a bad idle, but it CAN cause a car to quit running. Also ingesting water can cause this. At the top of this forum is a link to the Protege shop manual. The idle is rough enough to feel the car shake. 7 I5 with 120,000 miles on it. Vacuum leak symptoms. The two allen keys in the middle remove the plug cover so you can remove/change the sparkplugs. What Causes Rough Idle In My Car. some people seem to think that they are the first honda owners to have this problem. well i visit G2IC. Its purpose is to meter the air flowing into the intake manifold at idle. An Auto Zone diagnostic test determined that there is misfiring in cyclinders 1,3 and 5. It is a more comprehensive test with it removed. If it is not tight enough, or worn it is not able to run as smoothly as needed to keep the engine running smooth. These can include the alternator, air conditioning compressor, power steering pump, and power brakes. From the sound of things you likely have a miss-fire (yes if the valves are out of adjustment they can cause it), miss-fire will cause the blinking of the CEL and will cause the vehicle to drive with a lack of power. Look on page 01-02B-72 for a long list of possible misfire causes. on most cars, that would include A/C, power steering, the alternator, the. He suspected it was a PCM going bad but and all it ended up being was a bad ground. If you think you have a bad alternator you should either get it checked out for sure or replace it. All these are symptoms of a rough idle. See if your idle is actaully increasing when u turn on the a/c. Could a bad front O2 sensor cause the idle to be this bad without throwing a code? Hi everyone I just did my first timing belt job. Okay, I've been reading since I got my WRX, about the rough idle issues. 2002 Launch SSV Noise and Rough idle If this is your first visit, be sure to check out the FAQ by clicking the link above. These are just a few items that could cause a rough idle. All went well and after putting it back together it still has the same surging issue which is not surprising. you should be able to pick up on which one is bad. Ok, the squeaking and rough idle can be one and the same, could also be two different things. The remainder is so you can remove the rocker cover. Use a new cap if damaged. The engine light is on and the idle is rough. Bad spark plugs, bad spark plug wires and a bad distributor cap are other common causes of rough idling. The TPS idle switch bad or calibrated wrong, will only cause out of control idle regulation speeds. Mass Air Flow (MAF) sensor is the cause of rough Idle/Acceleration 80% to 90% of the time. Knock sensor wont affect your idle. Loose alternator belts also cause automotive components to work harder in order to compensate for voltage fluctuations. The 2 on the outside, and the 2 on the inside. Like a piece of paper or anything with a straight flat edge. Turn the engine off and restart and everything's back to normal for 10 mins then same fault again. However, if you know what some of the most frequent caused of engine vibration are, you can not only avoid too much stress and worry, you can know how to explain the problem and symptoms to a car mechanic when the time comes to correct the problem. In some instances a bad pulley may bind or slip and cause the belt to squeal when the engine is first started. well i visit G2IC. Fortunately, a mechanic can often alleviate rough idling without much trouble. Each has its own unique characteristics, causes and solutions. 05-07 is the problem years with chain guide issues. The problem is not noticeable under load; only at idle. Left the service and got same problem just after 1/2 mile. It is also good practice to replace the water pump and tensioner pulley at the same time as they ride in the belt path and can wear. A burnt exhaust valve can be $3K worth of damage. Generally speaking, if a car with a bad fuel pump has been running for a while, it will continue to run until the next time it is shut down, due to capillary pressure in the fuel line. The only code I got was 42, FTS, which is not likely the cause of the problem. At high speeds it runs fine. But currently its not throwing any codes and doesnt seem like there are any glaring issues, so all I can do is wait and see if the rough idle continues or I eventually throw a code. As fit code you can only pull active codes so if light is not on you can't pull any codes. It does not have full power, but does not stall. Since the weather got warmer this week, my wife has been using the AC and noticed a rough idle now all of the sudden. The issue will eventually worsen as the pulley continues to wear. NISSAN Rough Idle Anyone else with a rough idle When my truck is warm and idling at a light the rpms dip slightly and the idle becomes rough enough to feel vibration in the steering wheel and cause a droning low freq type sound in the cab. My car ran a lot better after this video, but Every once in a while I would still get some chugging - I. When this happens, the engine’s valves, which are powered indirectly by the timing chain, will no longer run correctly. - Rough idle is very pronounced, vibration felt on various parts of the interior - AC/Windows/Lights/Stereo do not affect the rough idle - RPMs do not affect the rough idle by too much I'm not irritated by it but slightly annoyed as my previous Civic 2000 had a smoother idle up until around 120K miles. A bad fuel injector will either deliver more fuel or less fuel to the engine, or fails to operate at the right time. My car is a 2002 Outback 2. Common signs of loose alternator belts include a loud squealing sound, improper voltage and flickering gauge lights, according to Pep Boys. A positive crankcase ventilation or PCV valve can cause an engine misfire, especially at idle and worse when the engine is cold. as for the backfire did this until i would make sure to let the motor idle down for 30 seconds or so before i shut it off when gettin off. It also vibrates a lot, but that's probably due to worn motor mounts (which I just ordered replacements for). This will result in squeaking sounds and idle vibrations. that's the hill billy way to check injectors. The idle is rough enough to feel the car shake. After a change you must reset the fuelling with the engine warm and consumers on via the diagnostics. It runs better cold. On those Lexus cars that actually have a timing belt, up to 2006 at least, the replacement interval was 90,000 miles or 6 years. I have have been dealing with this P0171 diagnostic trouble code for many years on many different year make and model vehicles. If you have a bad oil leak on the front of your engine, it's possible that your timing belt jumped a tooth. And keep in mind that the most rough idles issues come from lack of proper maintenance. Replaced Camshaft position sensor, no change. the runs great. In case of a timing belt, it’s a warning sign of a soon-to-be timing belt failure which you should appreciate. The engine has 200K on the bottom end and about 50K on a head gasket/head job. I believe you have two timing belts, one for each head, but even if they have figured out how to use a single belt on a horizontally opposed engine, there are still two (or 4) cams to time and it only takes one to be off a notch to cause a rough idle. A failed coil can cause rough idle. Two Reasons for Rough Idling on a Ford Focus Vacuum leaks or a faulty DFBE sensor might be to blame. Car Information: 97' Dodge Avenger ES 176k miles. If it has been a while since you changed these components, do so. Low cylinder compression causes a rough running engine. The NGK plugs and wires are new. Vacuum is steady at 21 inches Hg. Faster and Rough Idle after Timing Belt Change 09-14-2011 02:32 PM #1. If you suspect the belt causing rough idle, check the idler pulleys. Nobody does this, even at the audi dealers. Finding the cause of engine rough idle problems can be tricky at times, but paying attention to other symptoms besides the rough idle (shaking, noises, power loss) can help you close in on the source of the problem. When you change the timing belt, a good way to check the cam alignment is to lay a straight edge across the gears. 2005 Trucks, Crank/No Start, Hard Start, Runs Runs Rough at Idle: Pickups and vans built before 4-15-05 and Excursions built between 1-10 and 4-15-05 may exhibit hard or no start conditions with a low ICP signal, or a rough idle with a high ICP signal. 5 bar for each cylinder so good news but still no closer to finding the cause :S. A broken or loose belt, render fans and other rotating components are not to operate consistently. When alternators go bad it usually ends up with charging issues, if the bearings go bad, you get a grinding/whining noise. The only code I get is P0175 – fuel system too rich. Timing is correct. it still idles rough and the long fuel. Replacing the CHT will usually solve the problem straight away. The car runs significantly better and has no idle issue. Plugs are new, leads are new. In addition, cracked, brittle, torn belt, contaminated belt due to oil or power steering fluid can contribute to decreasing power. WHAT A POOR SET UP ON THIS CAR. A bad pulley can cause fraying on the edges of the belt, and in severe cases can even cause it to break. The grinding sound could be a tensioner pulley for the serpentine belt. Anyway, sounds like a problem with the idle air control (or whatever Subaru calls it). 5 years ago, and the cars had idle problems practically since I got it. As to the misfire, could it be the timing belt is installed a tooth or two off? Other than those 2 things a rough running engine at idle can be caused by a vacuum leak, low compression, faulty injector spray pattern, etc. I was able to keep the car running by revving but when I let it idle it would stall. If the problem started after replacing a timing belt or chain, checking the timing is the first thing to do. Therefore the most likely cause of P0171 and P0174 codes is a vacuum leak. A bad O2 sensor may cause the PCM to believe the cylinders are running lean, and cause it to run the cylinders rich, but usually not misfire unless there is a another problem present. On top of this I have noticed about 2 months ago that my engine rpm's when idle are irregular. Rough low idle, Bad MPG Problem Reports If you have a problem with your Eclipse you need assistance with, this is the forum to post your question and get answers. Fortunately, a mechanic can often alleviate rough idling without much trouble. Slow down and the CEL stopped. However, if the engine is running rough and then throwing the code, it is typically not the fan belt(s). I'm not sure if the mount would cause a rough or faster idle. The engine may run rough or idle poorly right after ECU reset. So if your car shakes when idle , check out if any of these parts are broken or loose. Nothing worse, nothing better. But then today, as I was driving down the road, my truck felt like it was bogging, so to speak. the runs great. A vacuum leak can be caused by a bad vacuum hose, intake manifold gasket, and other vacuum powered. well its a common problem. If the problem started after replacing a timing belt or chain, checking the timing is the first thing to do. Damaged bearing or pulley. 224,000 miles on it. Older Honda 4cyl. Engine idle speed may vary in RPM. Edit: Could be due to the gas going bad, but IIRC it usually takes longer than 3 months for that to happen. An Auto Zone diagnostic test determined that there is misfiring in cyclinders 1,3 and 5. Commonly, problems with an engine's air-fuel mixture cause engine knocking sounds to occur. 17) Check for Oxygen (O2) sensor function tests. The engine light is on and the idle is rough. after that, re-adjust your throttle cable, and your done. Still get a little rough idle every now and then. He did ask if the car's idle was running rough so I'm guessing that is the right sensor. Either of these conditions can lower the engine's efficiency and cause the "Check Engine" light to glow. A broken or loose belt, render fans and other rotating components are not to operate consistently. But when I put it in neutral or park, it lessens. The engine is shaking very hard. If the tension is too high, this will cause excessive wear to the belt-driven accessories. Many people probably have something out there for his but I'm just seeing what advice I can get. Coolant leak and rough idle. The symptoms are as follows: severe vibration whenever the car comes to a stop (it seems to be related to the suddenness of drop in RPM) at idle with the gear engaged in 'D' (~600 RPM). Another symptom, more visible, symptom of an issue with the idler pulley is a damaged bearing or pulley. A faulty alternator can fast idle issues; if so, replace it. It does not have full power, but does not stall. vote up Answer by If any of these are bad, they would cause the engine to run rough. Hi All, I have a 2004 model xc70 with about 107km's on the clock. Last time I ran a code reader it gave me a random misfire code, I did an oil chance full symthetic and the oil smelled of gas so I am guessing that the fuel pump is bad but I'm not sure that would be causing the rough idle and Dieseling. A bad idle-speed control unit can cause the problem; it may need to be replaced. 5k - 2k RPM. I have a 2000 Mazda 626, and it has 186,000 miles on it. We first looked at MAF, which I already changed and then vacuum leaksmy friend wanted to replace the idle air control, but we. If the tachometer is rock steady, and the shaking seems worse in gear than out of gear, that's a pretty good indication of a bad motor mount. If you change the belt (no idea why you changed. Replaced spark plugs, didn't find any vacuum leaks (going to pressure test today) Tried replacing coil packs No change. Not only that, but quite a few things can cause a misfire condition (or misfire trouble codes). It runs super strong 95% of the time, but Ive had an intermittent misfire issue. I cant remember but I am pretty sure its inexpensive. some people seem to think that they are the first honda owners to have this problem. That makes diagnosing the root cause challenge, especially if you aren't sure where. Several possible reasons cause the engine to sputter and run rough hat may result in engine misfiring but the most common are: What causes a car to sputter and idle rough 1) Bad valve 2) Bad coil or spark plug wires check the timing belt. If you are experiencing a rough idle or your RPM is running high, then there are a variety of reasons for why this could be happening. It must be another cause. Vacuum leak symptoms. So that problem is fixed. Back in the summer of 2011, the idling had gotten so bad that my car would stall in traffic, at stop signs, stop lights, drive thru. WOW what a difference. 7 Litre V8. My car is a 2002 Outback 2. Tap end of plastic cap on flat wooden surface to seat cap properly at base. so, i'm not sure if that's a sign that the timing belt/chain is bad or just another symptom of a bad IMG. A bad O2 sensor may cause the PCM to believe the cylinders are running lean, and cause it to run the cylinders rich, but usually not misfire unless there is a another problem present. The number of cars manufactured with power steering grew rapidly. Jumped valve timing can cause rough idle and since this is an interference engine, timing belt maintenance is very important. If it has been a while since you changed these components, do so. My 91 idles a bit rough, but when i turn on the a/c, it idles up and there is no roughness. The car has had an issue with vibration for some time now. Car Shakes When Stopped Or at Idle - Common Causes In Engine by Magnus Sellén 5 June, 2019 2 Comments It is perfectly normal for your car engine to slightly vibrate when in use due to the rotation and movement of essential engine components such as the gears and timing belts. 8 Gas engine refuses to idle below 1500rpm. Waiting for a code reader to be delivered tomorrow. 01-24-10 05:26 PM - Post# 1848715 I've been reading some of these threads and I need some conformation. What does this code mean anyway? The definition for this this P0171 code is Fuel Trim System Lean (Bank 1). When in park idle is fine like it should be. Had the BB Tune bump the idle up to 600 at 1000 miles and that seemed to eliminate it for the time being. What could cause this rough idle scenario, is the compressor going bad? Or belt? Thank you in advance. But if there is one thing that crops up time and time again it is a poor idle. Bad spark plugs, bad spark plug wires and a bad distributor cap are other common causes of rough idling. This component supports the engine in its compartment and absorbs the engine vibrations and road shocks. Depending how bad the gap was on the plugs, that may have been part of the issue also. Let's go over each of these causes in more detail and learn how they can be remedied. Enlist the help of others with troubleshooting your vehicle. When the engine is at idle, the driver clutch pulley should not engage the sides of the belt. What cause this problem ? Idle move from 600 rpm to 1100 and drop to 400 and back to 1000 non stop. Actually, if you don't. After idling for approximately 1 minute the check engine light flashes on the dash and runs smoother but not to its potential. Check the mounting area for signs of contamination and make sure the unit is properly secure. Possible Reasons Why the Car Is Idling Rough. Tap end of plastic cap on flat wooden surface to seat cap properly at base. Rotating one cam sprocket disturbs valve timing relative to the other side of the engine. Had the BB Tune bump the idle up to 600 at 1000 miles and that seemed to eliminate it for the time being. Generally, a vehicle uses the crankshaft position sensor for gross fuel and spark control, and the camshaft position sensor for fine tuning. when this happens, you will immediately lose all components powered by that belt. A bad TPS sensor can cause misfires upon heavy acceleration, but there will usually be hesitation along with it. Driving with a bad belt tensioner (luxury, idle, best, Audi) User Name: Remember Me: Password the risk is that the tensioner will somehow cause the belt to dislodge, probably by seizing. Rough Acceleration. This won't cause cold stalling but it can make for a rough idle once the engine warms up. My car would idle at stop around 1000, but then suddenly drop to 600-700 and feel like the engine is going to cut out. Yes a bad alternator can cause more resistance, but its highly unlikely. Belt-driven accessories fail. Back to the rough idle after all has been checked and confirmed good you still have the other parts of the emission system to check. As soon as you suspect a failing timing belt, you should have your car towed to a repair shop to avoid the chance of completely breaking the belt (if it hasn't already fallen off its pulley). Or your timimg belt. Avoiding a drive belt repair can cause much bigger problems. Fuel injected engines are very sensitive to fuel pressure as well as fuel volume. What is going on is I was coming home, and the engine started sputtering, and wanting to stall (after heavy rains), and the belts were squealing. If the tachometer is rock steady, and the shaking seems worse in gear than out of gear, that's a pretty good indication of a bad motor mount. In more serious cases, the bearing, or pulley itself may wear out to the point of breaking or cracking, and coming apart, or seizing. If the valve sticks in the open position it will act like a vacuum leak. 2005 pt cruiser 2. 16) Conduct a 'leak down test' on all exhaust valves. I have a 2000 Accord with a 2. Not related to gear or clutching at all. We decided with the mileage to do a timing belt. Ok please i need help i have a 1997 318i bmw convert 5 speed with a 1. Cosworth makes a timing belt guide that resolves that issue. Hi, I have a Fiat Punto 1. and they have a lot of useful information on there that can help these problems. First, however, they must determine the precise cause. What kind of problems can a stuck lifter cause to my auto engine? Can carbon deposits. Since a bad timing belt can put a damper on the firing rate of the engine, it will likely cause the engine to misfire. I taped the primer bulb in a almost vertical position and the engine will not even plane the boat it is running so bad, When i lay it down horizontal in the well it runs fine but will still stall at idle more often than not. How to Fix a Rough Idle or Stalling Car. It's worth a quick look. -After completing a timing belt change on 09 EXL the motor has a misfire and runs horribly at idle. The old plugs weren't fouled or anything so it may not be anything too bad hopefully. Way to many things can cause this to diagnose on internet. TPS on the TBI and MAP on the firewall operated by vacuum. 2002 Launch SSV Noise and Rough idle If this is your first visit, be sure to check out the FAQ by clicking the link above. The car runs significantly better and has no idle issue. Definitely worth it for the extra $3 per fill-up. Have a 2013 XC. The air filter looks fine. Car power steering developed fast After WWII. Burning Smell. When I come to a stop, it kind of spits and has a rough idle, but it hasn't stalled. Another symptom of bad or failing drive belt tensioner is. Cap and rotor, plug wires, sparkplugs, air filter, oil filter, v-belts, timing belt, belt tensioner, waterpump - all as needed. Bike started having a problem where it will randomly start idling and bouncing back and forth upwards of 400RPMs difference. Its also easy to install. 5 years ago, and the cars had idle problems practically since I got it. ON the bugeye 2. If the tachometer is rock steady, and the shaking seems worse in gear than out of gear, that’s a pretty good indication of a bad motor mount. A car running rough can be tricky to diagnose.