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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Replaced VCG today, now rough idle



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      01-31-2014, 10:16 PM   #1
Hankdoll
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Replaced VCG today, now rough idle

Indy replaced my valve cover gasket today and also the eccentric sensor because he said it was dirty. By the time we got home (10 miles) from picking it up, the car started idling very rough and threw the CES light. Car has 92k and has been trouble free. No symptoms before today besides the leaking gasket. I plan to pull the codes tomorrow if I can get my BT software working again. Indy is closed on the weekends, so I'm on my own. Any idea which part or sensor the mechanic could've forgot to fasten properly that would cause this?
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      01-31-2014, 10:27 PM   #2
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Rough idle only or drives rough too? Power loss?
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      01-31-2014, 11:26 PM   #3
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Did the Indy re-program the valvetronic motor limits?
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      02-01-2014, 12:53 AM   #4
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Quote:
Originally Posted by PINeely View Post
Rough idle only or drives rough too? Power loss?
More like running rough, like it's missing.


Quote:
Originally Posted by Sagerfly View Post
Did the Indy re-program the valvetronic motor limits?
Not sure, I'll see if its on the invoice. The car drove okay for about 8 miles.
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      02-01-2014, 01:19 AM   #5
PINeely
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My guess is a loosely-seated coil or one of the coil plugs came undone perhaps. All of that has to come out to do the VCG and would definitely cause a misfire if one shook itself loose.

Hopefully the gasket isn't unseated and leaking oil into the plug wells. If that were the case one of the coils could get drowned and start missing as well. Pull your coils and take a look at them.
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      02-01-2014, 10:38 AM   #6
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Maybe he messed up the valve cover gasket on the way back in and now you have a huge vacuum leak. Get the codes read if you want more information. Or better, you could hold the indy that did the work responsible.
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      02-01-2014, 02:28 PM   #7
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Thanks for the responses.

Car started up fine this morning. Pulled the code and had a misfire on cyl 4. Swapped the coil to cyl. 3 and drove the car for ten minutes, still ran fine. Restarted after 5 minutes and back to rough running. Check codes again, and the misfire moved to cyl 3. Assuming its the coil, but the bad coil threads seem to mention happening on cold starts, not warm restarts. We picked the car up from the mechanic and stopped at the store on the way home, so last night's issue was also a warm restart. I guess I'll replace to coil today and see how it goes.
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      02-01-2014, 03:13 PM   #8
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As others have said, the only ignition part that is removed for this job are the coils.
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      02-01-2014, 04:11 PM   #9
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If you moved the coil to a different cylinder and the misfire followed it then that is your culprit. Worry no more, mystery solved
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