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  #1  
Old 03-07-2017, 05:43 PM
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Default BMW 330i E92 strange rough Idle

Hi All,
I've got this rough idle when my engine is cold. When i'm on the road no problem. When i stop, it starts to do this. As soon as the engine is warm it goes away...
It smells gasoline and some white smoke is pouring out of the exhaust.
I've replaced all my spark plugs and my ccv valve recently. And i noticed 2 of my injectors were leaking a little. Nothing creazy is shown on inpa in rough running test.
Any ideas ?
Here is a video that shows the issue:
[Only for registered users... ]

Last edited by cybergogo; 03-07-2017 at 06:06 PM. Reason: video


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Old 03-09-2017, 11:22 AM
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FYI, I just ordered 2 new injectors so i can replace the two that are leaking.
What i'll do is when i'll replace those, i'll check the vanos and clean them. I'll also check the ignintion coils resistance to see if there isn't a bad one messing with my idle.
I'll let you know if it solves my issue.
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Old 03-10-2017, 05:57 PM
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Default just got the 2 new injectors

OK, so. BMW has been quick on this one, got the 2 injectors today.
I just replaced them and coded the car.
The corresponding spark plugs were wet, the 4 others were perfect. I've also checked the 6 coils resistance, all OK (below 5ohms which is the recommanded value).
I've also checked the vanos, you'll tell me what you think but i find they're quite clean...
Here are the Vanos before cleaning :



And after :



The result is a smoother acceleration, global behavior seems improved.
Still a bit of white smoke when engine is cold but much less.
I've checked the coolant, was above maximum, so no water leak, same for oil.
BUT, my idle is still going up and down.
To be specific, it's quite good when i'm standing still, not touching a pedal. As soon as I touch the clutch pedal, the idle becomes unstable.
Here is a video of my INPA vanos and lambda readings when the problem happens, you'll tell me what you think :
[flash=400,300]https://youtu.be/D2ukX8W9EOg[/flash]

Last edited by cybergogo; 03-10-2017 at 06:09 PM.
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Old 03-12-2017, 07:00 AM
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Vanos cause the same issue on an m6 only cold and on idle and no CEL light

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Old 03-30-2017, 05:28 PM
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Just a quick update.
I've replaced the water temperature sensor. The old one had a bit of oxydation on it but it didn't change the engine behavior.
I've also tried to unplug the MAF sensor, and it solves most part of the issue.
When plugged, the rpm goes up and down between 500 and 1400rpm. When unplugged, the rpm varies between 600 and 800.
So it's much better unplugged, not perfect yet.
Still, the strange thing is, this problem only happens when the engine is cold. Don't see the link between MAF and engine temperature...
What do you think about this? bad news is this sensor cost nearly 200€.
I'm still planning a complete admission cleaning this month, it will not arm...
Please let me know what you'd do if you were in my situation. :-)
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Old 03-31-2017, 02:27 PM
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Well, just did the smoke test, no leak visible...
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Old 12-12-2017, 07:13 PM
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Hi,
just a quick update since the last post.
I've performed a complete intake and valve cleanup + seals replacement.
It took roughly 7 hours, everything went well! after that, the car has smoother acceleration, idle is now at 620rpm instead of 740, with a little bit of vibrations at cold, but the cold idle yoyoing issue was still here.
Then my ECU decided not to work anymore, fortunately it was just a transistor that went bad and i've replaced it myself for 20€ (1500€ saved!).
It seems it burns a coil, so i replaced the entire pack. Still have the bad cold idle.
Last thing, i've had nox sensor errors. But don't know if it's because of the failing sensor or because of bad mixture due to bad injectors.
Will wait to see if the error comes back.
What do you think about all that?
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Old 12-12-2017, 07:38 PM
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HTML Code:
https://youtu.be/r9fSFeWBVcI
Ah and she's smoking white. Not losing any oil or coolant...
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Old 12-20-2017, 11:00 AM
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Quote:
Originally Posted by cybergogo View Post
HTML Code:
https://youtu.be/r9fSFeWBVcI
Ah and she's smoking white. Not losing any oil or coolant...
Check the idle control valve ?

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  #10  
Old 01-31-2018, 03:48 PM
n53 n53 is offline
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Hello,

I have the same problem, and I have done some of what you did already aswell as other checks :

- Fixed leaking injectors
- Clean Vanos with brake cleaner
- Restart adaptations (flywheel included)
- Increase idle RPM with INPA
- Verify if DISA is working properly
- 6 new coils
- 6 new spark plugs
- Cleaned MAF with contact spray (heavily)
- Verify low and high pressure fuel during coldstart / and when stopped via INPA
- Verify/clean throttle body

Nothing I have done solved the problem. Idle is rough and everything gets worst when I press the clutch, but when warm, everything is fine again.

But, I have a 2AEC code (NOx sensor) sometimes.

I will do a verification as bimmerprofs.com says to do, to check if everything is fine with catalytic converter system.

Did you find the problem?

Has N53 an Idle control valve as djrynyc is suggesting?

Last edited by n53; 01-31-2018 at 05:01 PM.
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