Car Idling Problems

another posible problem and solution It could also be a faulty brake booster. Well-Written Complaints » Complaints from very good story-tellers. We have over 2908 of the best Idle games for you! Play online for free at Kongregate, including NGU IDLE, Clicker Heroes, and Trimps. TrueDelta's car reliability survey only collects data on car problems and repairs that occur after people join the panel. A car might stall when shifting from park to reverse if the idle is set too low. To understand what the actual problem is, you must understand the signs to look out for. Since I've done my 3. Ran fine out running errands. My car ('02 Mitsubishi Lancer) has been pretty much overheating while I have the AC on & idling. Bad Idle Air Control Valve Symptoms. By adjusting this valve, thie idle timing will change on your vehicle. If your air is blowing cool but not cold, the problem could be a clogged filter, cooling fan problem, radiator trouble, or it could simply be that you need to recharge your AC. 6sx of 5 years and 4 months old, 77Kkm mileage. Porsche 997: Why Does My Car Have a Rough Idle? While many owners report the 997 may ride a little rough, don't assume everything is normal. Blipping the throttle raise the idle and put the light out, but after a few minutes it would return. Sometimes it's so bad the car will lurch like the engine has a misfire, or the transmission is trying to grip or something. Rough Idle. Loose or broken vacuum hose/vacuum leak. 6 litre when it comes to a stop, with the engine running like you do at intersections and traffic lights. Hopefully, the idle will be at about 750rpm. I am about to buy one and i tried the car for a little while, first of all tell me when it shows ECO IDLE in orange color in the meter what does that mean ? And when does it go green ? When i push the Eco idle off button the ECO IDLE FROM THE METER GOES AWAY and when i drove on that the car gave me 15km per litre with AC. 3, I can't get it to idle right. Car Trouble Symptoms Can Indicate Minor or Major Car Problems. Problems Carburetor doesn't adjust properly Carburetor floods Fuel leaks at shaft Internal fuel leak Misses or surges Stumbles or loads up Engine won't idle Rough idle Backfires Bogs Hard starting Lack of power Pinging at moderate cruise just off idle Engine stalls on hard braking Low fuel economy Possible Solutions. idling when the car is stopped. If the idle stays constant, your idle is set correctly. Some of you folk probably know about the problems I've been having with my Evo the rough idle problem that no-one could solve. This covers year models 1986-1993, and 1994-1995. I have a 2012 equinox , when i am idling. Sometimes the problem can be in the transmission if you have an automatic. now when im. What causes a rough idle? A rough idle can be caused by many different car faults. ) Jiggle the connectors to the slide valve and the controller box. While observing the valve with a flashlight, turn the key to the "ON" position, (DO NOT START ENGINE. Now I am having a problem when idling. I discovered that the intermittent idling was down to the throttle body position sensor. 6sx of 5 years and 4 months old, 77Kkm mileage. The car exhaust port is important as it neutralizes many of the harmful fumes that come out of the engine. It is also possible that the engine stalls because it is not fully warmed up before shifting from park to reverse. It will idle perfectly fine if I have the throttle stopper opening up the carb a bit to a good idle speed. Shop our large selection of parts based on brand, price, description, and location. Sometimes RPMs go down to 400 and car is OK (but battery light comes on for a second) and sometimes RPMs go straight down to zero. I have plenty of coolant in the system so it's not that. A common issue associated with the carburetor is air problems. MORGAN 4/4: The Zetec Bad Idle Guide The Zetec is a pretty reliable engine and can last well in excess of 150,000 miles. Car sometimes has rough idle and lurching motion. The idle control valve then ups the engine's idle speed by allowing air to bypass the throttle plate. There is also a light rattle when i step on the gas. Because of this, the crank spends a LOT of time in rotation before the next power stroke. If this problem happens while the engine is cold, it may be part of the engine's design. so im hoping someone out there can shed some light on this. I was reading some reviews and seem several comments were in that area and I seem to have that problem also. Re: Idling problems, sputtering at idle and low rpm's Try inspecting/changing the spark plugs, if youre lucky one (or two) is defect and causes sputtering and reduced power. Let's go over each of these causes in more detail and learn how they can be remedied. sorry to bump and old thread but my car had the exact same problem and it as fixed today by Ian Collins Automotive in Preston. Reducing idling in a number of community vehicles, such as school buses, taxis, police cruisers, and ambulances, can bring even bigger. Components in the fuel, ignition, emission and other systems should work correctly. It's more likely to happen if I stop while going up a hill, presumably due to a combination of the extra load on the engine and that I can stop more quickly on an. You may have a misfire, a vacuum leak, or a clogged/faulty idle air control valve. Any other warning lights turned on the dash when you try and drive the car? Misfire can be caused by worn spark plugs,a bad ignition coil, a bad injector, and a few other things. This can't be avoided when drivers are stuck in traffic, but idling releases pollutants that can contribute to global warming. Let's go over each of these causes in more detail and learn how they can be remedied. Diagnose Made Easy Don't know what's wrong with your car? Then use AutoMD's intuitive "question tree" car diagnostic feature. Motor mounts keep the engine attached to the car. What happens is dirt, excess air filter oil, and most notably carbon gunks up the IAC valve and doesn't allow it to either open or close properly. Our other car, '00 Mitsubishi Montero Sport is not keeping a proper idle RPM's and turns off. However, letting your car idle is actually detrimental to the modern automotive engine, wastes gasoline, and causes environmental damage. [Fixes Attempted:] Several months back (per list advice), I replaced the fuel relay, which up until the last week seems to have cured the problem. This problem has been getting worse over the last 2 years. I have cleaned the oil pressure sensor connector with no change, then replaced the oil pressure sensor itself with no change. Steam Idle Master. Well-Written Complaints » Complaints from very good story-tellers. Within a short period of time the car will return to rough idle as the underlying problem has not been fixed. my problem sounds a little like this… the only difference is the way my car idles… And all this happens sporadically… and sometimes even if the air is off… my 2007 Camry will idle at about 450-500. I drive a 2005 Dodge Neon SRT-4, my problem is when I first start the car whether it is early morning(6 or 7) or later morning (about 11). I'm unsure what it could be. Rough Idle. Idling is when a driver leaves the engine running and the vehicle parked. com, where you’ll find great service and even better prices. I have cleaned the oil pressure sensor connector with no change, then replaced the oil pressure sensor itself with no change. Have a rough idling problem with engine on and trans in park with the AC running. This covers year models 1986-1993, and 1994-1995. The car had about 50,000 miles put on it over 13 years, an elderly couple had owned it prior. All engines need fuel, air and properly functioning electrics to run smoothly. Because of this, the crank spends a LOT of time in rotation before the next power stroke. Stalling problem, idle problem, loss of power going up hills, completely powering down sometimes, heater blanking out sometimes and fuel smell coming insid × We use cookies to help our site to work, to help us understand how it is used, and to tailor advertising on this and other sites. Hi Austin, my car is a 2002 Pontiac Sunfire. 0 anyway it used to idle fine, now when i sit at idle the rpms often dip and rise. Every now and then at a stop, the car will get a jumpy rough idle. Idle speed wrong adjust, throttle housing dirty, check throttle position sensor. The troubleshooting procedure for high and low idle conditions are similar, which are included in the following: Difficulty Scale: 4 of 10. Idle and Stalling Problem Solved! For at least 4 years I've had idle and stalling issues that everyone who knows me knows about and has probably seen at least once. Rough idle problems are really common on BMW E36 cars and there are a lot of problems that may cause this to appear. Having your car’s air conditioning go out suddenly can ruin your day fast. This could result in an abundance of air mixing with the gasoline, which would result in a misfire. While there are a variety of reasons your Hyundai Elantra has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil. I've already changed 3 TPS's and 4 IACV's all of them original Ford parts and although the problem WAS fixed, it always came back after 2-3 weeks. All vacuum lines double checked. It is interesting that the shop "Replaced The Fuel Filter, Coil Pack, And Oxygen Sensor" These are not items I would suspect with an idling problem such as you described. Then, it would lose RPM's entirely. Connect Tech2. For you, TrueDelta developed the Car Repair History Survey. This information is from various sources, like my experience, AFM, the Ford Fuel Injection Book, other site members experiences. I threw some A/C Pro in the system. Idling can cause damage to your engine, including the cylinders, spark plugs and exhaust systems. I was convinced there was nothing wrong with the sensor. Idling your car is a waste of gas when the engine is in its operation temperature. I have a 2016 Chevy Malibu 4 cylinder Turbo having rough idle problems. High Engine Idle So, What can cause abnormally high engine idle speeds. While there are a variety of reasons your Hyundai Elantra has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil. Every year, hundreds of New Jerseyans die prematurely from exposure to diesel exhaust. Causes of a rough idle. good luck. I did immediately start it back up, but coming to complete stops, were getting the same result. Problems Carburetor doesn't adjust properly Carburetor floods Fuel leaks at shaft Internal fuel leak Misses or surges Stumbles or loads up Engine won't idle Rough idle Backfires Bogs Hard starting Lack of power Pinging at moderate cruise just off idle Engine stalls on hard braking Low fuel economy Possible Solutions. However, as a more practical guideline, balancing factors such as fuel savings, overall emissions and potential component wear on the starter and battery, 60 seconds is the recommended interval. Rough idling can be cause by a couple of things, vacuum leak somewhere in the intake, a dirty throttle body. Is the idling. The spark plugs are worn out. To see if this is really the problem, shift the car into neutral. If you idle your car, then the radio can still play. What happens is dirt, excess air filter oil, and most notably carbon gunks up the IAC valve and doesn't allow it to either open or close properly. I think that's the car shutting off the charging system while it tries to bring the engine back up to normal idle. Good day guys! My name is Carl Li and I just joined this group and I have a 2005 SLK 350. For winter warm-ups, consider a block-heater timer. What to Look For. 4i, ive been having problems with high and low idling, i have replaced both my idle valve switches, the problem was still there so i took the car for diagnostic, the diagnostic showed that the sensors where are faulty, they replaced sensors with original parts, the car was fine for about 20mins then the problem came back. (Read 7323 times) (Read 7323 times) 0 Members and 1 Guest are viewing this topic. Idle problems may originate in a worn out component, a failed part, or a blown gasket. A misfire may occur when your engine is idling, causing a rough or uneven idle. It's the EGR valve. Problem started when car was idling at stop sign. HI all, intersting thread here as my pals car is a 2001 1,6s AZD engine code car and this has been displaying the same issues, wher ethe car would rev fine when throttle pressed but idling was very rough and erratic and it hunts on the verge of stalling. Leaving car running at idle for long periods of time Hello I've read a bit stating that leaving your car idling for long periods of time is bad, but I'd like to explore this in a little more detail. A common complaint, especially when temperature start to drop is, “My car runs poorly cold, or my car is hard to start cold”. Broken engine and motor mounts will also cause rough idle issues. Or maybe something with the fuelfilter or something linked to the fuel, but because of the sputter while idle i guess the first option. Broken motor mounts can cause your car to shake violently when it is idling. When I was driving it, when I changed gear the engine speed increased. iv got a 94 mazda 626 2. The hose could be damaged, loose, or worn out, creating a leak. Idle speed wrong adjust, throttle housing dirty, check throttle position sensor. When a car’s distributor cap becomes faulty, the sequence of the functions of the engine will become out of order and will begin to fail. 4i, ive been having problems with high and low idling, i have replaced both my idle valve switches, the problem was still there so i took the car for diagnostic, the diagnostic showed that the sensors where are faulty, they replaced sensors with original parts, the car was fine for about 20mins then the problem came back. Does the idle respond to hitting the brakes even if the car is idling in neutral? And it seems likely that the problem is. To solve this problem, the engineers introduced the ISCV or IACV. so im hoping someone out there can shed some light on this. If all looks fine, use the cable adjuster to loosen the tight cable until the throttle will close fully, on its own. What's wrong with YOUR car? Find out common car problems directly from owners like yourself. What Problems Does a Bad EGR Valve Cause? Idling and stalling problems can really add stress to your daily commute. The answer to that question depends on the cause of the high idle. In this article, we will show you some possible and common signs of a faulty idle air control valve. My Car Idle Is Jumping Up And Down When Im At A Stop When im at a stop it idles up and down fast, about every 1/2 of a second for a while, and sometimes it would steady it self out, and sometimes not. What to Look For. I have a Pontiac Grand Prix. When you have a bad idle air control valve in your car, there are several problems and symptoms that will present themselves. Ok here it is: I have a 2005 rs. After much research of various books/internet threads, it seemed to me that a bad ECT would be causing my cold engine problems, even though I had just installed a new one in February. Hey guys, Mk6 fiesta with 1. Or maybe something with the fuelfilter or something linked to the fuel, but because of the sputter while idle i guess the first option. Spark Plugs. On the other hand, you shouldn't stop and start your car too much either. It appears to do so intermittently now. A rough engine idle or stalling is a common complaint, but in some cases can be difficult to resolve. Problems Carburetor doesn't adjust properly Carburetor floods Fuel leaks at shaft Internal fuel leak Misses or surges Stumbles or loads up Engine won't idle Rough idle Backfires Bogs Hard starting Lack of power Pinging at moderate cruise just off idle Engine stalls on hard braking Low fuel economy Possible Solutions. Sometimes this stalls the car, which is loads of fun in traffic. However the car still stalls a bit when it is finally warmed up but not as frequent nor as hard. This could result in an abundance of air mixing with the gasoline, which would result in a misfire. At idle (with the car sitting still) there is no way of moving the heat away so a fuel line located near by gets hot. If you're hearing "wheezing" that would be my thought. The idle air control valve — also known as the "idle speed control valve" — regulates the idle speed of your engine. The hose could be damaged, loose, or worn out, creating a leak. iv got a 94 mazda 626 2. Details, not numbers. All engines need fuel, air and properly functioning electrics to run smoothly. Ted's House e30 BMW Car Pages: e30 Vacuum Leak. If one of the cables is tight, check for problems or interference with the throttle pedal, cable routing, cable sheathing and the exposed section of the cable itself. Below are the four most common. If your Porsche 993 is having some rough idling issues, don't ignore them or. This problem has been getting worse over the last 2 years. Have spent a lot of money and time trying t get it the bottom of the Problem. Idling is not a problem restricted to personal vehicles. Idle reduction describes technologies and practices that minimize the amount of time drivers idle their engines. What you describe is normal. That is a given. When it does this you can see the cluster lighting dimming as the same time the idle hits the lower RPM of the erratic idling. In the evening when I started the car at the office parking, it began to idle at 2000 RPM. That adjustment will make the idle motor run in a different position to hold the preset 775 RPM. Car is a 2005 Outback with 2. And idling problems are really hard to pinpoint. When either of these problems occurs, your car can begin to stall when idle. When it happened the first time the check engine light came on. The car surges. Is a 4 hour drive. Only needed to warm up about 5-6 minutes. I needed to find a more permanent fix. Establish whether the car has idling speed vibration problems or shifts abruptly. Our(gas & diesel) plow trucks idle all the time. This information is from various sources, like my experience, AFM, the Ford Fuel Injection Book, other site members experiences. On the way to work, there was a lot of stop and go traffic due to potholes, and I was on 1st/2nd gear for about 15 minutes. Driving home, noticed the idle was all screwed up. This is the final calibration point in the system other than the idle mixture screws themselves. Hot Off The Press » The most recently reported car problems. Step 4 take your car to a trusted mechanic and play the noise back to the mechanic. Loose or broken vacuum hose/vacuum leak. One of the most common symptoms commonly associated with a problematic idle air control valve is irregular idle speed. Problem: After driving about 2 miles, on traffic lights RPMs go down and car stalls on idle. the Idle control actuator is not active at this time. Car Air Conditioner is Not Cold at Stops or Idle. Step 1 - If the check engine or service engine light soon has illuminated retrieving the diagnostic trouble codes could lead you in the right direction of what the problem is, or is related too. 4 duratec engine and only 15k miles. Running Problems. Broken engine and motor mounts will also cause rough idle issues. Let's go over each of these causes in more detail and learn how they can be remedied. In the evening when I started the car at the office parking, it began to idle at 2000 RPM. Went to a different station and filled up with premium. For Dummies: The Podcast Check out the brand new podcast series that makes learning easy with host Eric Martsolf. The exceptions apply to the following. Sometimes it's so bad the car will lurch like the engine has a misfire, or the transmission is trying to grip or something. First I will show you a video of such a rough idle and then list the possible problems that may cause that. BMW High Engine Idle RPM. I know the car is suppose to re-learns its operating settings after experiencing a dead battery but its been two weeks now and is showing no sign of improving. When i start the car, the rpm shoots to 2K(which is normal) but when it is returning to the idle state (700), it shoots past it and goes well below 400 before returning to 700. Idle fuel consumption from a range of model year trucks Average idle CO, HC and PM decreased and NOx increased for post-1990 vehicles. Engine Idle Is Too Low Or Stalls Dirty Throttle Body. Ever had problems with your car air conditioner not blowing cold air when idling? This happens in most cars when the AC system of your car does not have properly maintenance and it definitely makes you irritated to stay in the car on a hot day with no cool AC. I have a 2012 equinox , when i am idling. This article covers the common reasons that cause a Porsche 928 to rough idle. I have to hold the gas down for a while until the car warms up and then its fine. Car is a 2005 Outback with 2. All engines need fuel, air and properly functioning electrics to run smoothly. Idling laws tend to differ greatly across the United States, and can be a little tricky to remember (especially in states with larger, harshly regulated cities)! Check out this quick reference map to find idling laws fast!. Stalling problem, idle problem, loss of power going up hills, completely powering down sometimes, heater blanking out sometimes and fuel smell coming insid × We use cookies to help our site to work, to help us understand how it is used, and to tailor advertising on this and other sites. For awhile, it seemed if I put the car in neutral when stopped, the A/C would kick in. Probably the most common problem that causes idle problems in multiport fuel injected engines is a carboned-up throttle body. Idling Your Car Prolonged idling is also one of the worst things the owner can do to an engine. Pull the connector off the idle switch. If your car seems to be revved up to a higher-than-normal RPM while idling, it's not necessarily a problem. As long as the carburator or the throttle body wasn´t changed, the idle shouldn´t change. Did NOT stall at all. If you idle your car, then the radio can still play. If i put the car in neutral, idle it or even park the car the temp immediately starts cooling down. Why in the world is "excessive idling" defined as "severe duty" in all owner's manuals? I read in one column that idling is harder on the valve train than running at red-line is!. A car might stall when shifting from park to reverse if the idle is set too low. Sometimes it's so bad the car will lurch like the engine has a misfire, or the transmission is trying to grip or something. I've been told that something called an IAC valve might be the problem but Im unsure what im looking for and how to test/clean it. This can't be avoided when drivers are stuck in traffic, but idling releases pollutants that can contribute to global warming. • • • • • • • If the car exhibits vibration problems during cold starting for example, then the speed should be increased at a minimum (10 - 30 rpm). Dealing with high engine idle issues can be quite frustrating until you identify the cause of the problem. The Problem I have noticed idle dip on my wife’s NA 1. If I shift it into reverse, the idle goes back to normal (600 rpm). Ran fine out running errands. Idling is when a driver leaves the engine running and the vehicle parked. The idle was set before to a proper rpm. Spark Plugs. Details, not numbers. Find cheap used car and van parts. Low idle with an occasional stall. Usually a bad or failing idle control valve will produce a few symptoms that can alert the driver of a potential issue. If your car seems to be revved up to a higher-than-normal RPM while idling, it's not necessarily a problem. Did NOT stall at all. Because the problem always occurred in the transition from idle to higher RPM, I thought it must be air flow or fuel/air related- so started examining all the devices that control this. The most recently reported issues are listed below. He picked it up on VCDS as the KW power units were down slightly. Over the past few weeks I believe these problems have finally been solved. The PCV valve is a known problem with this car. Reducing idling in a number of community vehicles, such as school buses, taxis, police cruisers, and ambulances, can bring even bigger. kia forte 1. What to Look For. Somehow I have a problem with that because I use to start the car like 15 times in a short drive due to the idle problem and the battery never gave me a problem. Just last week the battery died and was replaced. Have a rough idling problem with engine on and trans in park with the AC running. School districts, fleet owners and operators, bus drivers, parents and students all have a role in helping to reduce diesel emissions from school buses. This is the final calibration point in the system other than the idle mixture screws themselves. I have a 2016 Chevy Malibu 4 cylinder Turbo having rough idle problems. The customer brinks the car cause it is rattling badly on the idle only. If there was, pushing the wire connector wouldn't have lead to a significant improvement in the idling RPM stability. Problem: After driving about 2 miles, on traffic lights RPMs go down and car stalls on idle. It appears to do so intermittently now. Depending on what make and model of car you have depends what you can do. The most recently reported issues are listed below. Continue reading to diagnose why your Accord's engine is revving while it is parked. Through this article, I also hope to give you simple ideas on how to fix this vibration problem. I think that's the car shutting off the charging system while it tries to bring the engine back up to normal idle. Prior to this, the car was running fine and I had no idle problems. Vacuum Leak. It didn't work but the very next day my car started to overheat. BUT A diesel can run into problems with extended idling. There is also a light rattle when i step on the gas. While there are a variety of reasons your Hyundai Elantra has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil. I've been told several things that could be wrong such as needing a motor mount, replacing the catalytic converter, and it being a potential exhaust leak. Idling your car is a waste of gas when the engine is in its operation temperature. Not sure if related. The idle was set before to a proper rpm. every time i maintain my speed on the the high or anywhere. Establish whether the car has idling speed vibration problems or shifts abruptly. and might be sticking open at times. It took quite an effort for the motor to start my car and I had to give gas to properly start my car Few theories on top of my friends after having a little chat with buddies. Every now and then at a stop, the car will get a jumpy rough idle. Irregular idle speed. However, it is easy to recognize the problem, as during rough idling either the engine would run at an irregular rate or it may have varying RPMs without your foot on the gas pedal. The engine is rebuilt with all new seals and the turbo as well. 6sx of 5 years and 4 months old, 77Kkm mileage. millions of cars and trucks idle needlessly, sometimes for hours and an idling car can release as much pollution as a moving car You may not be able to avoid keeping your engine running when you're stopped. the car starts to sound funny and the feeling is like the car is loosing gas or something. It’s particularly reprehensible in foul-aired places like London, where cars helped push the. The Importance of Idle Reduction You may be asking why have we dedicated a blog series on vehicle and fleet idling, the answer is simple – idling is costing you in more ways than you can imagine. Hey guys, Mk6 fiesta with 1. on a bad day, it will continue idling at 450-500 and the air will be hot. A rough idle should be inspected and repaired as quickly as. 2016 Malibu LT 1. The idle problem just popped up yesterday. However, as a more practical guideline, balancing factors such as fuel savings, overall emissions and potential component wear on the starter and battery, 60 seconds is the recommended interval. They cant figure this out. Prior to this, the car was running fine and I had no idle problems. The rpm seems low and there is jerking in the engine noise as the ECU (I thhink) keeps chipping in to prevent stalling. Sometimes, the computer can tell you what is wrong [instructions]. If you are interested in our maintenance tips topics, let's follow us for more and more daily updated articles. Running Problems. I am about to buy one and i tried the car for a little while, first of all tell me when it shows ECO IDLE in orange color in the meter what does that mean ? And when does it go green ? When i push the Eco idle off button the ECO IDLE FROM THE METER GOES AWAY and when i drove on that the car gave me 15km per litre with AC. When the engine seems to rev up on its own while you are at a standstill, you may wonder if it's a sign of trouble that needs the attention of a mechanic. In order for an engine to start and run cold, it requires more fuel than when it is hot. The exceptions apply to the following. Grinding or ringing noises while breaking. A car exhaust smell can be due to many different things. Q: I have a 2009 Volvo S60 and I occasionally get a message "DSCT requires service" or "DSCT temporarily off," usually on hot days and after the car has been idle for a while. We start the car andthe same problem!. The idle problem started after I twice left my lights on and drained the battery until it was dead. Fuel problem injectors malfunction. Most vehicles have a maze of hoses throughout which create a vacuum 2. The dreaded stalling/idling problems have once again returned. However, letting your car idle is actually detrimental to the modern automotive engine, wastes gasoline, and causes environmental damage. and might be sticking open at times. my problem sounds a little like this… the only difference is the way my car idles… And all this happens sporadically… and sometimes even if the air is off… my 2007 Camry will idle at about 450-500. 4 cylinder engines fire every 180º of crank shaft rotation. Today I was at lunch and the car died 4 times in a one hour period. if the car shakes alot it´s most common not a problem of the idle, it´s a hint that you should take a closer look at your engine because there is something wrong with the air-fuel mix, or the ignition. The idle air control valve — also known as the "idle speed control valve" — regulates the idle speed of your engine. Car revving without accelerator - WTF? On reading and asking for advice it looked like the common problem was the idle control unit I jacked the car up and emptied the oil out before. A rough idling engine can be caused by spark plugs or spark plug wires. idling when the car is stopped. com has gone bad already. To see if this is really the problem, shift the car into neutral. That is a given. Hi, I seem to have a idle problem on my Revo 3. If this problem happens while the engine is cold, it may be part of the engine's design. Does your car shake or shutter while stopped or idling? These 5 reasons could be why. Top 10 Causes of a Rough Idle 1.