I posted recently about a minimum idle adjustment that just ain't happening, so I'd like to be able to verify the wiring to the IACV, since the IACV itself is fairly new. I know there's 4 pins on it - anyone know what is THE way to read it out? Voltage, etc., depending on what mode... Help if ya can - thanks...

KAM

 

Is the reply to your "how to adjust for minimum idle" post not happening, or is your engine still idling too high?

Tim

 

Tim - yea, I got a reply there, but after checking TPS and making sure it was good, I still can't adjust idle down. I'd like to check the wiring to verify that it (IACV) is getting the proper signal, but I don't know which wires to read out and what voltage, etc. I'm looking for. This is just to check the wiring. Again, I don't really suspect the IACV itself, since it's fairly new, but doesn't mean it can't happen. In trying to set minimum idle, once the IACV is disconnected, the idle will not come down below 1300 rpm or so. The adjust screw will keep going, but the idle stop stops moving, leaving a dead gap between the stop and screw. Thanks for any help you can give...

KAM

 

I believe the IAC is a stepper motor, so there are pulses sent to it from the ECM to rotate the threaded "nut" that moves the plunger toward and away from the idle air port in the lower TB cover. Have you checked the output of the TPS @ idle? If it is greater than about 0.5 to 0.6 volts, that may be causing the high idle. Also, a vacuum leak could cause a high idle.

Tim

 

Yea, I'll have to get back in there and check. The other day I made sure the TPS was set properly... Wasn't really paying attention before, but see you live in Az. I lived there for 14 years... Huachuca City (still have an aunt there), Benson, Kingman...