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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > N52 Low Idle?



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      11-20-2012, 01:32 PM   #1
index1489
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N52 Low Idle?

When I'm driving and come to a stop the idle goes to 750-700 for a second (normal smooth) then drops to 500 after which it gets really rough then goes back up and settles at 550-600.

24 Second Video

Please mute had the radio turned up.


Vacuum Leak?

Car has all new plugs/coils.
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      11-21-2012, 08:47 PM   #2
mlifxs
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I have around 102k miles on my N52 328i. My car does something like that when all three below are occurring:
a. Car is in D, P or R and car is not moving.
b. Foot on the brake.
c. AC is off.

If I change any of the above, the idle increases slightly and the vibration is gone.
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      11-22-2012, 10:32 AM   #3
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Quote:
Originally Posted by mlifxs View Post
I have around 102k miles on my N52 328i. My car does something like that when all three below are occurring:
a. Car is in D, P or R and car is not moving.
b. Foot on the brake.
c. AC is off.

If I change any of the above, the idle increases slightly and the vibration is gone.
Similar issue on my N52 128i. RPMs would dip below 6000 intermittently while stopped at a stop light, having the AC on would solve this issue somewhat. Brought it in to dealer, they found no faults but "adjusted idle values" which increased the idle RPM to around 7250-7500 about 2 months ago. No issues since, engine is smooth as silk.
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      11-22-2012, 11:03 AM   #4
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Quote:
Originally Posted by youngdoc1
Similar issue on my N52 128i. RPMs would dip below 6000 intermittently while stopped at a stop light, having the AC on would solve this issue somewhat. Brought it in to dealer, they found no faults but "adjusted idle values" which increased the idle RPM to around 7250-7500 about 2 months ago. No issues since, engine is smooth as silk.
Lol, you added to many zero's there buddy because if your car idles at 7000+ RPM that would be crazy loud and your car would be out of gas in no time.

To the OP, mines never went below 600 RPM and I have a 328i. But just make sure your new spark plugs are tightened/torqued properly and see if there is any difference. Also about the vibration try to see if your motor mounts are leaking any fluids.
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      12-02-2012, 10:56 PM   #5
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I would check the vanos solenoids. See this DIY for more info:
http://www.e90post.com/forums/showth...ighlight=Vanos

He is physically replacing the solenoid but all you need to do it pull them out, clean them with some MAF cleaner and then hit them with some compressed air. I would switch the exhaust and the intake also to help extend the life of them. They commonly get clogged which can give you the symptoms you see above.
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      12-07-2012, 01:38 AM   #6
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I've done the solenoid cleaning and actually swapped them places a while back I was getting a code that they were sticking.

I put a bottle of seafoam in the gas tank for a small improvement.

Anyone have any other suggestions?

Thanks
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      01-02-2013, 01:27 PM   #7
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My car normally idles around 650-700 RPM and it is smooth. I was having a long crank while starting and it would run rough for a minute and then I scanned it and saw I had an intake camshaft position sensor code (2A9A) and so far after 2 weeks no issues. It was almost guaranteed I would have the issue more than twice a week.
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