3-Series (E46, E90)Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.
I've a few items to tend to on my wifes '01 325CiC 5 speed. One of which is the brakes (see separate post) and another is a slightly irritating idle issue.
I'll try to describe the symptoms. With the engine at operating temp, coming to a stop the idle drops well below its normal idle speed - to the point that it almost stalls, but then recovers immedately. The majority of the time it drops and recovers to normal idle right away but occasionally it will "cycle" 2 or 3 times before settling at it's normal idle. The computer is not lighting the SES light.
I've read a number of posts with symptoms that sound similar but those have concerned fluctuating idles with a cold engine.
First thing to do is contact dealer and check out, if your car has latest DME software updates.
Other thing to do would be, to ask them (if not update is avilable) to set engine idle rev speed from 750 rpm to 875 rpm-problem will be solved !
Once and awhile my car does the same thing, and I've pinpointed to the A/C compressor. It will only do it if the air is on, and when the compressor kicks on and off. There is an electronic idle control valve (not sure what BMW's technical name for it is), that I believe is just sticky. It didn't do it when I replaced everything under the hood, now it does.
If you normally run the A/C, try turning it off and see if it still does it. If you're not running the A/C, I don't know what else to go for, other than what others have already posted.
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