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Problem solved ! High-idle after cleaning IAC, Throttle-Body and Injectors 700 1985

posted by  ndesouza on  Wed Sep 22 16:12 CST 2004
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last visit: Sun Mar 18 15:14 CST 2012
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Hi Art,

1. I've successfully traced the White/Red IAC test probe all the way to Pin 12. I then grounded it and also verified I was getting ground at that point n the ECU connector. Is there a component in the ECU connected to these pins that could blow ? Maybe a past owner tried plugging that pair of leads into something.. In any case - does grounding Pin 12 simply result in the IAC fully closing ? Because if that's the case, I could do it manually too...

2. Ditto with pin 22 going to the White/Green CO Test Point. Traced and tested it. However, will also try connected the LED at the ECU connector end to eliminate wiring as a culprit (must do this with Pin 12 too).

I dont think the wires are reversed though, because I am achieving ground on the CO test point to light up the LED - something that I dont think could be done with the ungrounded idle test-point.

Not sure what you mean by backprobing pin 6 on the AMM. Could you elaborate ?

3. So it must have been the fully-serviced IAC then !

Thanks again,

Noel






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