[Shotimes] IAC voltage questions

[Leigh Smith]

Had the same issue with mine and also could not make sense of voltage 
signals. Wondering if there is a wire that chafs? or a connector that's 
loose? This wire goes thru a connector or two on the back valve cover. I 
Traced it there. Let me know if you find a solution.

Lee


Rbade12@aol.com wrote:
> Fall's here and so is my annual battle with bouncing, surging, erratic idle. 
> Since the problem rears it's ugly head as temps drop one would think it's a 
> temp sensor. I've checked all out per Probst manual directions and all are 
> OK. I get no error codes [unless it stalls and I get that fuel pump error 
> code, which I ignore]. The one device that doesn't check out properly is the 
> IAC [or IAB or ISC]. The valve itself checks out fine but the signal from the 
> EEC-IV module doesn't read as the Probst manual says it should. The manual 
> states backprobing the wire from the module with engine running, the voltage 
> should vary from 3-11.5 DCV as you slowly increase/decrease engine RPM. I get 
> 10 volts at idle and it decreases to 8.5 as I increase RPM. This has been 
> done with engine at operating temp. If I don't get those #'s the manual says 
> the EEC-IV module or wiring may be faulty. Has anyone anything related to 
> this test or my #'s or anything that may clear up my problem. It is a clean, 
> new IAC valve and, as I said, all other sensors check out properly. I'm 
> leaning toward a funky computer, thoughts???   Thanks!!       Bob 93 MTX
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