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      10-18-2012, 09:30 PM   #23
Mike Benvo
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These problems really concern me.

Other than the idle control valve and fuel pressure sensor taking 4.5 years to go bad on my 12/07 build - I have not a single engine issue to report.

I've seen more issues on 2011/2012 cars than the earlier ones.

Even the dealer says that certain things are normal when I think it's anything but!

An example is the idle fluctuating on start (bumping up and down). My car doesn't do it, but a couple of friends have this issue the dealer claims to be normal...
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      10-18-2012, 09:39 PM   #24
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Quality of the M3 sucks. RANT.
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      10-18-2012, 10:39 PM   #25
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Is this a DCT only problem ?
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      10-22-2012, 11:18 AM   #26
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One other thing I just tried... In gear at a complete stop with brake engaged, if you turn the steering wheeling at least a 1/4 turn, the idle goes up and stays up just like if the brake is released. Turn the wheel to on center again and the idle goes back down. Anyone else?
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      10-22-2012, 09:12 PM   #27
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Quote:
Originally Posted by ecalcagnino View Post
One other thing I just tried... In gear at a complete stop with brake engaged, if you turn the steering wheeling at least a 1/4 turn, the idle goes up and stays up just like if the brake is released. Turn the wheel to on center again and the idle goes back down. Anyone else?

Tried this today and I was able to duplicate this exactly as you wrote it. Clearly we have the exact same problem, which I am hoping amounts to a problem with our brake vacuum booster. Let's be sure to keep ourselves (and everyone) updated on a resolution. I will probably try to take my car in around 4-5 weeks from now so if you bring yours in sooner please let us know what they found - thanks.
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      10-23-2012, 10:40 AM   #28
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Quote:
Originally Posted by Mike Benvo View Post
These problems really concern me.

Other than the idle control valve and fuel pressure sensor taking 4.5 years to go bad on my 12/07 build - I have not a single engine issue to report.

I've seen more issues on 2011/2012 cars than the earlier ones.

Even the dealer says that certain things are normal when I think it's anything but!

An example is the idle fluctuating on start (bumping up and down). My car doesn't do it, but a couple of friends have this issue the dealer claims to be normal...
I've never had the fluctuating idle on cold start until this fall. During the past few weeks, anytime the temp is around 50 or colder in the morning I'll get 2-3 seconds of fluctuating idle (700-1200) on cold start. No codes are being thrown and the car is still driving great. No loss of power, etc.

Just out of curiosity I got ESS to send me another copy of my tune with cold start disabled. I flashed it on about a week and a half ago and haven't run into anymore issues. Everything starts up smoothly in the morning no matter the temp. Mike, do you think this fluctuating idle problem has something to do with an aftermarket x pipe/tune combo?
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      10-23-2012, 01:19 PM   #29
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Originally Posted by RBB View Post
I've never had the fluctuating idle on cold start until this fall. During the past few weeks, anytime the temp is around 50 or colder in the morning I'll get 2-3 seconds of fluctuating idle (700-1200) on cold start. No codes are being thrown and the car is still driving great. No loss of power, etc.

Just out of curiosity I got ESS to send me another copy of my tune with cold start disabled. I flashed it on about a week and a half ago and haven't run into anymore issues. Everything starts up smoothly in the morning no matter the temp. Mike, do you think this fluctuating idle problem has something to do with an aftermarket x pipe/tune combo?
Not sure if it's relevant or helpful but I owned 3 E46 M3 Convertibles, all of which had the fluctuating idle on cold start. Dealer always told me it wasn't normal but frankly I didn't bother to get it fixed, as by the time I realized it wasn't normal I was on to my 2nd M3 and I never had any problems with the 1st! Anyhow, if it makes you feel any better it consistently happened on all 3 of my E46 M3s and it never caused any issues. And we're talking about 11 years of ownership.

Not sure if the E9x is any different but I hope that helps...
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      03-17-2013, 02:36 PM   #30
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Quote:
Originally Posted by jeremyr4 View Post
Tried this today and I was able to duplicate this exactly as you wrote it. Clearly we have the exact same problem, which I am hoping amounts to a problem with our brake vacuum booster. Let's be sure to keep ourselves (and everyone) updated on a resolution. I will probably try to take my car in around 4-5 weeks from now so if you bring yours in sooner please let us know what they found - thanks.

Sorry to bring this thread up but recently my 12 month old E92 M3 has started doing this in the last couple of weeks.. took it to the dealer who just said there was nothing wrong with it and just handed it back to me still doing the random rev drop at idle.

I would appreciate anyone's comments as to what it could be or what I can do?

Thank you!
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      11-22-2013, 09:46 AM   #31
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Anyone fixed this problem?
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      11-22-2013, 12:33 PM   #32
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Originally Posted by basara078 View Post
Anyone fixed this problem?
Not me BUT I can tell you that the problem has stopped on my car. I honestly have no idea why. I have a 2013 E93 M3 (Convertible) that had the problem pretty much from when I bought it. Not sure if perhaps my OEM Exhaust Mod helped but I can tell that seemingly randomly the problem stopped on my car about 4500 miles in. I currently have roughly 5000 miles (I've actually had the car since Sep 12 so I'm very low mileage). Anyhow, unfortunately there isn't much insight I can share, aside from the fact that perhaps the computer made some type of adjustment on its own or my OEM Exhaust Mod caused a change. I am honestly not very technically savvy when it comes to these cars so I have no idea whether it's even technically possible that the OEM Exhaust Mod could affect things.

Sorry I couldn't be more helpful but perhaps my experience indicates that the computer might adjust things after a while on its own. It took me about a year before I saw the change.
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      11-22-2013, 05:10 PM   #33
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Quote:
Originally Posted by jeremyr4 View Post
Not me BUT I can tell you that the problem has stopped on my car. I honestly have no idea why. I have a 2013 E93 M3 (Convertible) that had the problem pretty much from when I bought it. Not sure if perhaps my OEM Exhaust Mod helped but I can tell that seemingly randomly the problem stopped on my car about 4500 miles in. I currently have roughly 5000 miles (I've actually had the car since Sep 12 so I'm very low mileage). Anyhow, unfortunately there isn't much insight I can share, aside from the fact that perhaps the computer made some type of adjustment on its own or my OEM Exhaust Mod caused a change. I am honestly not very technically savvy when it comes to these cars so I have no idea whether it's even technically possible that the OEM Exhaust Mod could affect things.

Sorry I couldn't be more helpful but perhaps my experience indicates that the computer might adjust things after a while on its own. It took me about a year before I saw the change.
I got this problem issue after updated 240e, I'm going to try go back to 231e version. I'll tell you result.
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      11-22-2013, 08:24 PM   #34
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I noticed the dct's at the PC during my friends e92 delivery , they all had a rough idle, the only time I have an issue on my e90 manual is after I fill my tank with gas some times the idle drops low and almost stalls, after 2 min of driving it goes back to normal . First time I notice this was around 30k now I have 130k so I guess it's nothing to worry about but as far as everyday idle it's on point at just around 750
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      11-27-2013, 12:12 AM   #35
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I noticed the dct's at the PC during my friends e92 delivery , they all had a rough idle, the only time I have an issue on my e90 manual is after I fill my tank with gas some times the idle drops low and almost stalls, after 2 min of driving it goes back to normal . First time I notice this was around 30k now I have 130k so I guess it's nothing to worry about but as far as everyday idle it's on point at just around 750
I have the same issue just this past couple of month, and I occasionally have a sputtering sound from starting up the car then it goes away after 5 seconds or so and is totally normal.
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      11-27-2013, 10:59 PM   #36
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I have a pretty rough idle as well. 6MT. I'm pretty sure it is when I press the brakes as some people have mentioned. What's the deal?

Little rough when I first stop, then it usually goes back to normal. Totally fine when driving.
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      11-28-2013, 04:40 PM   #37
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A problem with the booster - a vacuum leak - would cause a higher idle, not lower.

With the AC compressor on, the engine idles with a bit more power (slight air/fuel adjustments via the ECM) to compensate for the additional load, hence why this behavior doesn't occur with AC on.

I wonder if the DCT is engaging a bit when the brake is depressed, like with a conventional automatic, and this load is causing the idle rpm drop. It is probably normal or at least causing no damage.

I don't have an M3 but I would put it in N to see if the issue goes away. (I hope to get an M3 one day, so I like to read up on the technical issues that pop up)
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      01-17-2014, 06:46 PM   #38
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I have the same problem, in my case, it happens often after I get a full tank of gas (91, mobile, chevron, shell). After the start up, car in neutral (6 speed) not stepping on the brake, but e-brake sometimes or sometimes I will just park on the level ground. But RPM will start to jump up and down then if i don't start the driving, car will stall. I am seeking for this solution also.
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      01-17-2014, 06:58 PM   #39
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I have the same problem, in my case, it happens often after I get a full tank of gas (91, mobile, chevron, shell). After the start up, car in neutral (6 speed) not stepping on the brake, but e-brake sometimes or sometimes I will just park on the level ground. But RPM will start to jump up and down then if i don't start the driving, car will stall. I am seeking for this solution also.
On board for this one as well. My 2011 DCT car has had sporadic idle issues for the past couple of months. On a couple of occasions the car has actually stalled while stopped at a stop light. Once or twice more it has come close enough to the stalling point that the transmission put itself into park...

Thought it was a bad tank of gas at first but I have switched between my local Shell and Chevron with no change though it does seem worse after filling the tank. Definitely worse with the added load of having the AC compressor on. Still see some idle fluctuation without AC on but the stalling is only with AC on. Car is due oil/scheduled service in a couple hundred miles so will have the dealer look it over shortly.
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      01-17-2014, 07:03 PM   #40
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I have a 2011 DCT and I have this problem as well. I always thought the RPMs stayed high at 800 due to A/C being on (after all A/C does use motor power).
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      01-17-2014, 07:25 PM   #41
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With the AC compressor on, the engine idles with a bit more power (slight air/fuel adjustments via the ECM) to compensate for the additional load, hence why this behavior doesn't occur with AC on.
Somebody also mentioned the turning of the steering wheel causes the RPM to go higher. So this would probably be the ECM adjusting for the additional load of the rack and pinion power steering. As the pump sends the hydraulic fluid (steering fluid) to either side of the rack piston.

So many things this can be. Throttle body related issues can cause this symptom. However, it just might be the ECM adjusting and overtime it adjusts itself to the additional loads etc and smoothes out. ??? Good luck!

Last edited by M3-S65; 01-17-2014 at 07:44 PM.
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      01-17-2014, 07:42 PM   #42
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Somebody also mentioned the turning of the steering wheel causes the RPM to go higher. So this would probably be the ECM adjusting for the additional load of the rack and pinion power steering. As the pump sends the hydraulic fluid (steering fluid) to either side of the rack piston.

Yes - this was me. Aside from the idle being ok (750) if the A/C is turned on, if I turned my streering wheel it would temporarily jump higher but then come back to down 500. But, as I mentioned in one of my previous posts, my rough idle issue has disappeared and I honestly have no idea why. Very odd...

Good luck to everyone. Hopefully someone will figure this out...
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      01-21-2014, 01:58 PM   #43
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I have the same exactly problem, same exact symptoms. Similar spec car (2011 DCT).
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      01-21-2014, 02:15 PM   #44
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Same exact problem post-fill up. 2010 6mt here. Took it into the dealer back in September and they gave me the "cannot replicate" argument.
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