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Old 12-18-2012, 01:15 PM
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ahull ahull is offline
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Location: Carolina
Join Date: Apr 2006
Posts: 4,278
Mein Auto: ist schnell! (03 330i SC)
If you are sure you have no error codes, I would suggest having your ICV Idle Control Valve Cleaned. Otherwise, it could be a camshaft position sensor (usually throws a code though), or a dirty Mass Air Flow MAF sensor.

At the age of your car, a number of small items can fail or need attention. Cam/Crank sensors can fail, fuel pumps last 8-12 years (usually long start cycle or no start or dies shortly after starting - make sure it gets a fresh fuel filter every 60k miles and don't run on low tank much as the fuel cools the pump too). A clogged CCV crankcase vent/oil separator can cause problems too - many replace at 80-100k as preventive maintenance. Upgraded VANOS seals too if the car's more than a couple years old.

Here's some reading (the wiki has a lot of links on common problems besides just this section):

Last edited by ahull; 12-18-2012 at 01:17 PM.
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