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Trying to determine if IAC has failed.
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Posted by iveand [Email] (#3155) [Profile/Gallery] (more from iveand) on Mon, 2 Feb 2004 07:06:10 Share Post by Email
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I have been having significant starting issues in the cold lately (-20F to +30F ... every day same issues). I only have problems with the first start of the day, after that, it runs fine. Here is a summary of what is done already.

-IAC cleaned 2 times (second to re-lubricate)
-new spark plugs
-2 bottles of techron 20oz.
-new air filter
-all vacuum hoses checked (replaced crankcase-TB one)
-flushed engine 2 times, now running synthetic to battle sludge (unrelated?)

Along the way I have done quite a few other things in the past few months ... previous posts attest to the "sludge" battle going in in my 2.3, as others are battling as well. I hope to win.

Anyway, now to my question. With the key in the "on" position, but the engine off, the IAC "hums" fairly noticibly. Loud enough that I can hear it just by having the hood up. Everything seems to point to a bad IAC (it only has problems at idle when starting ... starts, dies, starts, dies; after "warming up" it runs fine ... idle is a bit sporadic, but something "frees up" after starting it and holding the rpms at 2500 for a few minutes to warm things up). Fuel filter and pump were replaced less than a year ago. I simply have a "mixture" problem from all diagnosis that I have done. Has the IAC failed? Can I check with a 9v battery over a few of the pins to see if it responds? Any advice on how to troubleshoot this?

iveand
96 900s 2.3 5-speed 127K

posted by 24.123.11... 
_______________________________________
2006 9-3 Aero SC 2.8T 6-speed (current)
1990 900 SPG 2.0T 5-speed (current)
1985 900 2.0T 5-speed ("DOA" donor car)
1985 900 2.0T 4-door 5-speed (gifted to friend, RIP)
1996 900S 2.3L 5-speed (gifted to friend, RIP?)
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