Unstable Idle On Cold Starts - BMW Forum - BimmerWerkz.com

3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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post #1 of 1 (permalink) Old 06-10-2005, 11:27 AM Thread Starter
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netdude is an unknown quantity at this point
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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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