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cold startup - unsure idle 200 1989

posted by  greg_mustang on  Wed Sep 17 08:22 CST 2003
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last visit: Sat May 10 07:26 CST 2014
[RELATED]

240 DL sedan 1989 B230F 235K kilometers (~140K miles)
original, very well kept, not tampered with

Recently when I start the engine cold, it idles at 450 or so unsure RPM for around 5 seconds, then goes up to the expected 750 or so and idles fine. In addition, the FIRST pressing of the throttle from stop almost stalls the car if anything more than a very gentle foot. After that, it drives fine, and takes off perfect from a stop.

The car has no history of such problems, and has always driven very well.

I'm thinking IACV, but not sure. I replaced the AMM last year, my old one was dead, with a junker, and the replacement worked perfectly. Hoping this is not AMM, rather expensive and limited part up here in Canada.

Does the IACV just open/close to allow air into the intake past throttle? Is there a motor in there? Silanoid? Does the wire contact on it often go bad?

Looking for some advice, thanks!

Greg Mustang
Montreal - Ottawa
Canada





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