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...maybe that method is in Steve's FAQ? I don't recall seeing it in any form other than a question.
But to answer yours, "If grounding the test point, doesn't induce the ecu to hold the armature closed, is the alternate method of clampig the IAC hose shut to set base idle off base?", I'd have to first verify what flow the base idle setting test point allows. Of course, if it is anything other than nothing, clamping the hose would be a poor alternate.
Yes, I've had a scope on the idle motor (LH2.0 and LH2.4), but I didn't take any serious measurements on the three wire version at the time. (years ago) I've managed to own a number of these cars without yet being able to blame the IAC for any of my troubles. I think your frequency estimate matches my memory - vibrated about like my pager does.
You are right about the source. I'd be interested to see it, though ordinarily I don't want to see any code after work. The black box approach presents more challenge; learn what it does and infer what it is supposed to do. It helps to share what's been learned so we can whittle away at those common mysteries.
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Art Benstein near Baltimore
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