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IAC Valve: Does it operate only at Fully-Open & Fully-Closed modes, or are there different positions ? 700 1985

uid 27's pic
posted by  Art Benstein on  Sat Oct 9 07:36 CST 2004
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last visit: Fri Oct 17 20:10 CST 2014
[RELATED]

John, thanks for the email alerting me to your response. I think the thread has a lot of valuable info, so I'll add to it rather than directly reply.

Abe's explanation of something other than fully closed is called for when the base idle is adjusted meshes perfectly with my concept of how it ought to be designed, i.e., the idle computer would then have the ability to decrease the air as well as increase it from what is supplied by the bypass path.

But, that concept has some disturbing refutation in green manual suggestions I've seen quoted second-hand, where alternatively base idle is set with the hose pinched.

Now, more than ever, I have to go do an experiment on my LH2.0 car, using a dwell meter on the IAC signal, the base idle grounding, and a spare idle motor to view operation (see how much the valve is held open) with that signal supplied.

Abe also addresses the mixup possible with those two 3-pin plugs. I think it might be easy to damage the ECU (IAC driver transistor) if even momentarily run that way.

Thanks for finding that (however did you?) and posting.

--
Art Benstein near Baltimore






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