Unstable Idle On Cold Starts - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 06-10-2005, 11:27 AM
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hi! i am having a weird problem with unstable idle on cold starts. it's weird.. here goes:

when i start my car cold... the idle freaks out a bit and jumps around between 500rpm and 1200... this only goes on for about 10 seconds (if that) and it eventually goes to around 800 or so.

however, if i spray WD40 on the throttle body... it starts up perfectly... well, it starts at about 1000 or so, and slowly (within 5 seconds) drops to 800 and stays stable there.

So... my solution so far is to spary wd40 every weekend or start the car and hold on the gas for a second and slowly manually drop the idle.

Any suggestions? Anyone with a better idea for a lubricant? I hear WD40 attracts dust so that's probably not the greatest lubricant for the throttle body.

Any help would be greatly appreciated. Thanks a million.
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#2 (permalink) Old 06-11-2005, 12:15 PM
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Have you cleaned the throttle body yet? Take it off and spray a solvent such as carb cleaner into it, both sides, with the body in the opened and closed position. Allow the solvent to evaporate or otherwise dry then replace.

The other possibility is that you have a vaccum leak near where the throttle body is. However, here is my question to confirm this. Is the idle only settled the first time that you spary the throttle body? Or is it calm for the next start or next day as well. If not I would check for vaccum leaks as well as cleaning the throttle body.
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#3 (permalink) Old 06-12-2005, 07:17 PM
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maybe it is reving higher so that the motor warms up quicker and disperses the oil throughout the engine.

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