In order for the automatic IAC to function properly [it does alot more than just set idle] like setting the fall off rate of rpm when you suddenly lift throttle at 60 mph to prevent engine stalling. the problem goes away eventually though. White smoke and/or coolant odor may come from the exhaust for an extended period of time at cold start as well. My 2002 325i seems to idle rough and hesitates especially when it is hot outside. Rough Idle. So anyone got those specs, or is that a blind alley as the engine might have hydraulic lifters. When leaving work, I went to start the car. However, the shaking goes away after driving. Idling and driveability problems can be caused by a variety of issues. It ran a few seconds, very rough, and died. Because it is! Personally I'd check to see if the alternator is providing the right amount of voltage. it also seems the longer i sit the worst it gets. 2008-2014 BMW Vehicles Engine Issue. Q: I had a low oil level without any warning lights that I didn't know about, I drove the car at around 70MPH on a mountain road for 20 minutes and when I parked the car was all shaking on low RPM when idling. 0-liter turbocharged four-cylinder engine, which is paired with an. But diesels are also known for their idle clatter, black smoke and cold-weather starting woes. but i still feel a bit of stuttering until the temp reaches mid-way (normal hot temp), after then everything goes back to normal. I will post up a video after work today. No CEL at this point. what would be the reason if the car runs rough after changing the battery on 2001 BMW X5. The brake pedal is low and spongy. Drive to work is smooth on freeway other than the first couple of gears. How to Tell if Your Car's Thermostat Is Stuck Closed. Mine is doing it too, rough idle at start. No loss of power or any issues while driving. left bank does not seem to be burning all the fuel took out the injector it seems to be fueling fine coils seem to spark fine start bike pull off injector wire off, the bikes idle stays the same pull off right bank and bike dies left bank. They seem to occur for no apparent reason. 0 - Hard start, rough idle Home. First I will show you a video of such a rough idle and then list the possible problems that may cause that. Checking the Idle Air Control Motor. Hi I have a BMW 3series e91 with N52B25 with the following issue. No faults ever set when the skip was felt but at times the vehicle would almost stall. Categories: American Classic Cars | Muscle & Pony Cars. April 13, 2015. It's not all the time but when it happens it feels like something switches and it starts vibrating. Your BMW X5 is a premium sport sedan that is a blend of performance and luxury. This is a good example of how basic engine diagnostic tests can work to pinpoint the root cause of the cars problem. Categories: American Classic Cars | Muscle & Pony Cars. My car runs rough (like it is missing) on cold starts, and the secondary air pump sounds loud. Skip to content. Solex 30 PICT/2 Carburetor Adjustment Procedures. Just a couple of days ago, my 91 Sierra 5. It would catch, fire a big, chug, then die. 8 it tends to have a bit of a rough idle as the warming up process moves through its stages. Rough Idle & Stall While Stopped. Rough idle / jumpy after cold start 328i x drive Does anyone experience sort of a rough idle and the transmission being jumpy after a cold start on their 328? I notice that the car shifts overly hard and feels jumpy but it goes away after like a minute of driving and never comes back unless you leave the car off for several hours. Mine is idling ~500 rpm and seems to idle roughly when sitting in gear with my foot on the brake. I have a 95 Suzuki Sidekick JX 4x4 16 v 1. An open thermostat or the wrong thermostat may be preventing the coolant from reaching its normal operating temperature. IP: Logged Message: My Dakota is a 1993 4X4 Club Cab 3. I have an old shape 520i (6 cylinder). Even when hot, sitting in drive, it runs rough, although not bad enough to effect acceleration. Average failure mileage is 76,150 miles. my mechanic BMW specialist chap tested a few things and replaced a few perished hoses. On later model vehicles, a check engine light may accompany the issue. This is characterized by a ticking sound (at idle) or the sound of marbles (under throttle) on the passenger side of the engine bay, most noticeable just after startup. When its warm outside and the engine is cold, the car starts and runs fine. So I was thinking maybe the guy had the timing set way advance (like 16) because valves were off. Hidden cause. April 9, 2010. '88 735i, very rough idle in warm weather, better in cool weather, great in cold weather. The battery could still be bad and if you don't have a totally good battery in the car it won't run right. When left to idle in Park or Neutral the roughness would usually lead to the engine stalling after a few minutes. It does not miss at anything above idle and will do this one day then not the next. As its idleing however, the rpms fluctuate up and down erratically and then it'll smooth out for a few min and then it will begin again. Once the auto choke begins to come open it smooths out. It even quickly revs itself to about 2k occasionally when stationary too. BMW E39 E46 E53 Rough Cold Start Misfire Common Causes For M52 M54 Engines - Duration: 10:15. -Engine ticking can occur, particularly with older E36’s. Voluntary Emissions Recall Campaign No. April 9, 2010 When I first start the car the engine will shake a little until it warms up. This issue does not happen when starting the car with a warm engine. When it's slow to do so, the idle is often low. BMW E30 uneven idle especially when cold won't know the car is cold and will not activate the cold start fuel map. It ran well for approximately 4 months but now the issue is back again. Dirty Fuel Injector Modern vehicles are fitted with fuel injection systems, which inject fuel into the cylinders to create a mix of air and fuel to burn. It is nothing to cry about in my book, so I am not going to do anything about it. Hi guys - hopefully (I'm sure it is) a very minor fix/garage visit to fix. Rough Engine Idle: One of the most common symptoms of faulty fuel injectors is an extremely violent or rough engine idle. BMW sensor faults and problems. The bike went into BMW recently to have a software update and have the alternator drive belt replaced. At first my wife thought it was the gas we were using and we since switched. Unplug the VANOS actuator solenoid electrical connector. left bank does not seem to be burning all the fuel took out the injector it seems to be fueling fine coils seem to spark fine start bike pull off injector wire off, the bikes idle stays the same pull off right bank and bike dies left bank. Discussion in 'E39 which translates into a rough cold idle and other fun. It has right at 78,000 miles on it and is bone stock. However, the shaking goes away after driving. Normally, a. An open thermostat or the wrong thermostat may be preventing the coolant from reaching its normal operating temperature. It may also Run rough when warm, slight knock, no codes setting. What to Look For. Is my engine really that sensitive?. I replaced the spark-plug cables with "newer" cables. Hi For the past couple of weeks when the temperatures have been at or below around 4 degrees I'll start the car from cold, it will fire up, make a feeble attempt at idling then just die. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328. While there are a variety of reasons your BMW 328i 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. BMW did not treat the injectors as a wear and tear item when they. In an attempt to restart, the motor turned over easily but won't start. If you are the owner of a 2007-2009 Mini Cooper S model you need to be aware of the problems Mini & BMW are having with their High Pressure Fuel Pumps (HPFP). 5 turns out on one side. The best course of action is to take your vehicle to an Omaha auto service professional, but here are a few things it could be…. Seems to run fine otherwise. I spent a lot of time reading the archives and following every M103 thread for the last 3 months. Idle jumps up to 1500 and down to 1000. Plugs are fine. But you have to give it fuel to keep it running period. Rough idle / jumpy after cold start 328i x drive Does anyone experience sort of a rough idle and the transmission being jumpy after a cold start on their 328? I notice that the car shifts overly hard and feels jumpy but it goes away after like a minute of driving and never comes back unless you leave the car off for several hours. This answer is applicable for many BMWs in addition to the one listed below. You might think it is normal, but that is the engine misfiring and pushing raw fuel out. Dirty or faulty throttle valve, idle air control valve, bad temperature sensor, and more. Idling and driveability problems can be caused by a variety of issues. It happens when I start my warm engine, it runs rough for 30 seconds and I even feel a 2 seconds delayed accelerator response like if I had low fuel pressure. The check engine light came on and giving a little gas it began to run properly. A BMW E60 rough idle repair is an easy procedure that is usually caused by a bad DISA or idle control valve on the intake manifold of the car. my truck does something similar. I have also read that rough idle on start up is common on these cars. Probably as simple as a battery. Original review: Oct. but i still feel a bit of stuttering until the temp reaches mid-way (normal hot temp), after then everything goes back to normal. 0-liter turbocharged four-cylinder engine, which is paired with an. Additionally, the engine may run. A rough engine idle or stalling is a common complaint, but in some cases can be difficult to resolve. When I first start it in the morning it seems to have a rough idle. So Mini says the issue is carbon build up and cleans it all out and installs new plugs. I cannot comment on why 6 cylinders do not do it - but I suspect they idle well above 500 rpm, as I recall from my old 335i. '88 735i, very rough idle in warm weather, better in cool weather, great in cold weather. Is this normal, or should I have it looked at during my next service?. The 1993 Buick Century has 1 problems reported for rough idle at start. BMW E30 M20 Idle Control Valve. As the first wave of BMW 5-series E60s reaches an automotive geriatric age of 15 years old, parts begin to wear out and our beloved bimmers start to lose their once silky sweet engine performance. Is there a common cause for this type of thing, the bike was fine when I last used it and I have not altered anything since last riding it. If the PCM receives an inaccurate engine temperature signal at cold start-up, a rough idle may be created from. A BMW E46 rough idle repair is a fairly simple job that requires replacing your DISA and idle control valves. 3L GDI ENGINE. That sometimes get removed accidentally and will cause the fault you have and rough running at idle. My car has been declared SORN and been off road for about a year. driving down the road it does fine, never sputters or struggles, but once i stop at a light it starts the rough idle. A new code that I haven't seen also popped up, P0444. 4L 2008 Chevy Equinox that runs rough on initial start up. The symptom is repeatable everyday. Worn or damaged intake boots on your BMW can cause a number of drivability and running issues: stalling, rough idle, and throttle stumbling are a few. Finding the problem can be daunting, especially with so many sensors and switching valves involved. Its not so rough of an idle like its misfiring, so no worries in at the moment. Hi Fellow members, My car has rough idle only on cold starts until the engine warms up (lasts only 30 secs until the critical warmup). 9 Z3 had a rough idle (sounds like a lumpy v8!). driving down the road it does fine, never sputters or struggles, but once i stop at a light it starts the rough idle. Start by removing the oil cap and checking for a center cone that goes through the filter. Over the last two years or so the van had developed a rough idle issue. M54 Idle Control Valve Removal and Cleaning E39 E46 E53 E85 - Duration: 7:22. Once the auto choke begins to come open it smooths out. After about 3 minutes of running the engine, if I turn it off and then on again, it will run and idle very smoothly and problem free. My car runs rough (like it is missing) on cold starts, and the secondary air pump sounds loud. If the idle air control valve is dirty, no matter how much it opens, it may not allow enough air to pass by in order to raise the idle enough to keep the engine running while cold. Now if i give the car a little gas for about 30 secs and let it warm up a bit its fine and drives great. When trying to start, it's as though it doesn't want to idle. 2015 Cruze, 45K miles 1. 6 HDI erratic idling - YouTube. Diesel engines are real misers when it comes to sipping fuel. I suggest having a certified technician, like one from YourMechanic, perform a few tests to be able to diagnose the exact cause of your stalling issue. Engine rough idle can be caused by a series of problems, or just one faulty component or adjustment. my truck does something similar. Mine does this every once in a blue moon, all I do is rev it a few times or hold it at 2-3k RPMs for a few seconds and it clears up right away. Im not sure a BMW dealer will diagnose this any better than an indy- they tend to be the 'whats the code, we'll do what the computer tells us' variety. It did this on the previous tank I gas too, so it's not likely bad fuel. The car has a really rough idle and wants to stall when the MAF is plugged in. 5 turns out. What are some of the symptoms of the code? Symptoms of a P050D engine code may include:. Louis BMW Club • View topic - X3 3. Already scanned the vehicle with PA Soft and Torque , but couldn't find any lean codes or whatever. I was experiencing a really rough idle/vibration and a little hesitation. When I first start it in the morning it seems to have a rough idle. First check the terminals to make sure the connection is not loose or. That from a month ago there is misfire in cylinder 8,7,5,2. Used BMW 3 Series. Seems to run fine otherwise. Condition: A vehicle may have a concern of DTC P050D setting along with a P0300 after a cold startup. Hence, after knowing the ways to troubleshoot rough idle when warm problem, anyone. BMW Sensors Problems and Faults. 0L OHV Vulcan engine, I had the "Hot soak start rough idle" intermittent issue. Some symptoms of a bad Idle air control motor wiring harness are engine will not stay idling, idle will be too high or to low. Most often an input sensor has failed or the throttle body has a problem. as you can see in the video and after about 10 seconds of starting the car and while the engine is trying to idle, the rpm will start to stumble and I can feel the rough vibrations of the engine. It even quickly revs itself to about 2k occasionally when stationary too. Recalls and faults: BMW E64 6-Series Convertible (2004-10). Well, you tell us nothing about the car, sostart at the basics. Engine drivability strategy is much different under cold start conditions. Start by removing the oil cap and checking for a center cone that goes through the filter. When I went out to start the car the next day it would not start. From the description you have provided, for the P0301 rough idle and heavy misfire and P0456 evaporative small leak detected, the problems are unrelated. White smoke and/or coolant odor may come from exhaust for an extended period of time at cold start as well. Some older cars use a carburetor to process fuel, rather than a fuel injection system. Perfectly performing N53 in few hours! Rough run. Because it is! Personally I'd check to see if the alternator is providing the right amount of voltage. BMW 328i Idle Control Valves are required to guarantee safe motor idling speed. 265 new on web, not the end of the world. It will get down to about 45 at idle. 2009 N54 335i - Rough Idle and misfiring when cold. only happens when its first started in the morning. Towed to dealer. Some symptoms of a bad Idle air control motor wiring harness are engine will not stay idling, idle will be too high or to low. Few times later I fell a change on the engine let it to idle and for my surprise the rough idling was gone At this time it was still smoking, but fading out a few more revs and the smoke was gone. My car is running extremely rich and has a terribly rough idle with extreme hesitation when applying throttle. I am aware of a valve cover leak but it is because one stud is stripped. One of the most common glitches on the BMW E30 3 Series is an erratic engine idle. Lately, my 2006 (40k miles) has had somewhat rough idle when starting after sitting for a day or more. Immediately upon getting it back, began having starting problem. White smoke and/or coolant odor may come from the exhaust for an extended period of time at cold start as well. Try again, it starts and is rough like three cylinders are firing. Hey guys, As the title states, there's something weird going on with my M2 (~850km). 0L OHV Vulcan engine, I had the "Hot soak start rough idle" intermittent issue. I have replaced the AFM, O2 sensor, tested the ICV,replaced the TPS, replaced the engine temperature sensor, and replaced the intake manifold gasket. After work (8 hrs) small amount of rough idle, stops in about 10 seconds. When it's slow to do so, the idle is often low. 0litre N43) which is currently suffering from a rough idle on a cold engine start up. Use our SEARCH BY MODEL feature to filter these items for your BMW. I am aware of a valve cover leak but it is because one stud is stripped. 2009 BMW 320i Petrol M-Sport 34000 miles manual When I leave my car for a while, get back in & start it, the idle is a bit rough - the gearstick is more shaky (orange engine management warning light sometimes flashes) and if I drive it for a couple of miles, stop & turn the engine off & restart it, it is "back to normal. only happens when its first started in the morning. E36 M3 Evo rough idle problem SOLVED. BMW Motronic Fuel Injection Problem Solving. If the rough idle occurs only under cold start conditions, a malfunctioning engine coolant temperature (ECT) sensor may be at the root of your problem. A handful of times, it's actually stalled. it's. Sprayed out with carb cleaner. Now it is occuring. left bank does not seem to be burning all the fuel took out the injector it seems to be fueling fine coils seem to spark fine start bike pull off injector wire off, the bikes idle stays the same pull off right bank and bike dies left bank. But, for example, if the SFT is running high positive numbers at idle and returns to zero as the engine speeds up, you’re probably looking at a vacuum leak. If the rough idle occurs only under cold start conditions, a malfunctioning engine coolant temperature (ECT) sensor may be at the root of your problem. Plugs are fine. This issue does not happen when starting the car with a warm engine. The BMW 328i Idle Control Valve has to be equipped to open up and close because if an idle control valve becomes plugged with dust and grease then the vehicle will experience lower horsepower and can stall at stop signs. If the idle is not correct with 2. Bought my first BMW last month'06 330i, 36,000 miles CPOhave been noticing that it idles kind of rough and has a somewhat rough start up when it sits for a little bit (several hours), didn't think much of it until yesterday when I started it up after work and it really acted up. Starting at that temp was bad. Was told it is not covered unless repaired by a certified BMW dealer. Rough Idle? Knowledge Base. 4L Poor Idle Quality, Hesitation, Stall … 1999 BMW 540i 4. 1 On September 29th, 2008, Vidma said:. If your vehicle is experiencing rough idling, you’ll probably know it immediately. The rpms do drop on the cold mornings and spike back up but again it doesn't stall but I'm pretty sure thats the vanos seals. An open thermostat or the wrong thermostat may be preventing the coolant from reaching its normal operating temperature. 8 it tends to have a bit of a rough idle as the warming up process moves through its stages. driving down the road it does fine, never sputters or struggles, but once i stop at a light it starts the rough idle. Service it. You could have several things contributing to the hard start. Voluntary Emissions Recall Campaign No. Once the engine seems to heat up the idle stabilizes. 4L, BMW E38 740iL M62 4. Some vehicles, like many Subarus, have injectors that you can actually hear opening and closing at idle. the most important page on this site!. Idling and driveability problems can be caused by a variety of issues. when the car is accelerating it blows warm air but as soon as u come to a stop and idle say st a light it blows cold air ,even if u free rev it ,it stays cold Any help please! The engine coolant temperature (ECT) sensor test is simple and can help you fix your car faster. Drove home, no problems. When key in the ignition, starts cranking very weakly. Bought my first BMW last month'06 330i, 36,000 miles CPOhave been noticing that it idles kind of rough and has a somewhat rough start up when it sits for a little bit (several hours), didn't think much of it until yesterday when I started it up after work and it really acted up. As the revs start to drop down the engine has a couple of splutters, not stalling though, and then runs as normal. Fuel odors inside and around the car. It happens when I start my warm engine, it runs rough for 30 seconds and I even feel a 2 seconds delayed accelerator response like if I had low fuel pressure. Hello there and welcome to the BMW Car Club of America. It's done about 34,000 miles at the moment. Seemed to be worse when engine was cold. Re: 320i E90 Engine vibration, rough idle and misfire Scan for fault codes for a start There is a reason why the ride has hundreds of sensors. Also, it may run fine most of the time but suddenly misfire or cut out for no apparent reason. If there is an open or short in the idle air control solenoid, wiring or driver circuit, or the idle speed it out of range, it will usually set one or more fault codes and turn on the Check Engine light. Check out the video below for more information. 6 thoughts on “ Running Rough?? Check engine light? No Problem!! ” Brooks December 16, 2014 at 11:11 pm. This is a little odd. Drive to work is smooth on freeway other than the first couple of gears. The car is running rough at idle, going up and down in rpm and shaking. When cold , starts and idle fine but when I try to accelerate misfires and runs sluggish, black smoke from exhaust and poor response. Subject: White smoke and rough idle. I checked everything from plugs, coils, vanos, and even the engine mounts; all in good shape. Hey guys, As the title states, there's something weird going on with my M2 (~850km). When a vehicle begins to idle rough or stall, the idle system requires service. When the engine is started cold, regardless of the outside temperature, the idle is rough and there is a noticable power loss. It happens when I start my warm engine, it runs rough for 30 seconds and I even feel a 2 seconds delayed accelerator response like if I had low fuel pressure. The X1 wins points for its powerful base engine and comfortable, yet sporty, ride. The fix here is to rebuild the VANOS actuators using available rebuild kits or replacing the VANOS actuator units. Filters, oil etc. When a vehicle idles low, the vehicle stalls or shakes excessively when the brakes are activated, and this is an indication of a serious engine problem. as I downshifted at the exit, the Check Engine light came on, which for some reason always comes on when I downshift at this exit. My 02 Trailblazer LTZ with the V6 has recently started idling rough. When cold starting my 2. Curing Rough Idle. What Are the Causes of Rough Idling in Cars? by Richard Rowe When you really think about how an engine works, about all of the tiny events that have to happen inside at just the right time, and to just the right degree, it's kind of amazing that they run at all. Next cold startup it ran perfectly FINE. Introduction. Is my engine really that sensitive?. Immediately upon getting it back, began having starting problem. They're also known for their pulling power and rugged durability. A common shake is a vibration that can be felt mainly through the steering wheel. A misfire may occur when your engine is idling, causing a rough or uneven idle. 4L Poor Idle Quality, Hesitation, Stall … 1999 BMW 540i 4. When leaving work, I went to start the car. Or, it may start and idle fine but then misfire or hesitate when it comes under load. BMW 328i Idle Control Valves are required to guarantee safe motor idling speed. Recalls and faults: BMW E64 6-Series Convertible (2004-10). When it's slow to do so, the idle is often low. Solex 30 PICT/2 Carburetor Adjustment Procedures. Rough Engine Idle: One of the most common symptoms of faulty fuel injectors is an extremely violent or rough engine idle. If the rough idle occurs only under cold start conditions, a malfunctioning engine coolant temperature (ECT) sensor may be at the root of your problem. our custom remote start module for bmw 745i, bmw 745li, bmw 750i, bmw 750li, bmw 730i, bmw 730d, rolls royce phantom and other bmw e65 e66 e90, e92, e93, e60, e61, e63 and e64 e70, f01, f02, f07 and f25 bmw thermostat problem and solution. This is a little odd. It only happens for a short while after start up. I have read posts from a number of you about the rough idle you are experiencing at cold start. They're also known for their pulling power and rugged durability. When a vehicle idles low, the vehicle stalls or shakes excessively when the brakes are activated, and this is an indication of a serious engine problem. You could have several things contributing to the hard start. A major problem with the Bmw E34 especially the M30 3. Occasional white or very light blue smoke only on start up. More: Violent, one time, shake on cold start is a product of a low idle. my truck does something similar. that is actuatly a BMW repair. Twice now the dash lights for Stability Control, EML, and engine icon have come on with accompanying rough engine and poor acceleration. Poor Idle Quality, Hesitation, Stall, MIL Lamp On: 02 540i cold start/rough Idle help! BMW CCA Forum Nov 09, 2010 · Hello there and welcome to the BMW Car Club of. When cold , starts and idle fine but when I try to accelerate misfires and runs sluggish, black smoke from exhaust and poor response. I have also read that rough idle on start up is common on these cars. I have replaced the AFM, O2 sensor, tested the ICV,replaced the TPS, replaced the engine temperature sensor, and replaced the intake manifold gasket. It started to idle rough and become a liitle hard to start about 35,000 miles. I have a 1998 M3 with about 130K miles that is not my daily driver. So anyone got those specs, or is that a blind alley as the engine might have hydraulic lifters. Condition: A vehicle may have a concern of DTC P050D setting along with a P0300 after a cold start up. Now if i give the car a little gas for about 30 secs and let it warm up a bit its fine and drives great. If your engine is showing symptoms like these, we recommend you get your car checked by a trusted mechanic, as continual driving with a burnt valve will cause more damage to your engine, and will in turn cost more to repair in the long run. my truck does something similar. See this video of a misfiring engine. The vehicle builds up excessive white smoke at idle but then tends to clear on. Types of Smoke From Your Car Tailpipe & What It Indicates. Start by removing the oil cap and checking for a center cone that goes through the filter. The problem was not fixed by replacing the ignition coils and intake air sensor, although that did lessen the severity of the startup engine idle problem” Anonymous, TX (2008 BMW 3 Series 328i 3. A quick test for rough idle on M52 engines (1999-2000 MY). E60 525i N53 Cold Start Rough Idle - Fault Codes bare in mind I never had any rough start-up before so this is only due to clearing adaptations. You might think it is normal, but that is the engine misfiring and pushing raw fuel out. M54 Idle Control Valve Removal and Cleaning E39 E46 E53 E85 - Duration: 7:22. BMW E36 M52 (6 Cylinder) Idle Control Valve and Crankcase Vent DIY Failure modes for the idle control valve and crankcase vent aren't pretty. This page covers fuel-injected cars. Finding the problem can be daunting, especially with so many sensors and switching valves involved. Some symptoms of a bad Idle air control motor wiring harness are engine will not stay idling, idle will be too high or to low. only happens when its first started in the morning. driving down the road it does fine, never sputters or struggles, but once i stop at a light it starts the rough idle. Power doesn't seem abundant lately either. Then you should check all the vacuum hoses — a leaking hose can cause a too-lean mixture and a rough idle. The BMW 328i Idle Control Valve has to be equipped to open up and close because if an idle control valve becomes plugged with dust and grease then the vehicle will experience lower horsepower and can stall at stop signs. So I'm drawing a blank and getting frustrated as I'm off on a 6,000 mile trip in a couple of weeks. Louis BMW Club, a chapter of the BMW Car Club of America St. BMW E61 530i. Previous Previous post: P0508 Chevrolet Idle Air Control Valve Sense Circuit Low Next Next post: P0510 Chevrolet Closed Throttle Position Switch Malfunction Leave a Reply Cancel reply. What happens when throttle body is dirty? It can cause a rough idle. Next day still, no rough idle upon startup. it runs fine when i first start it, but soon idles low/rough, but only in gear. Rough idle. When you start it cold, the engine idles fine but when it warms up a bit, it gets really rough and at times cuts out.