repairs not working correctly

Asked by Jan 08, 2016 at 09:00 PM about the 1994 Chevrolet C/K 1500 WT LB 4WD

Question type: Maintenance & Repair

I was doing some maintenance  to my 1994 chevy cheyenne c
1500 truck and was cleaning the harness plug on IAC valve and
it fell apart. I bought a replacement, installed it and the motor is
idling high. I replaced the IAC valve and PCV valve and it
continues to idle really high and fast. Cannot figure out the
problem. Is it a vacuum line I'm missing or is the computer brain
not sending the right command?

2 Answers

80,325

I believe on an OBD I vehicle you have to set the pintle length on the IAC to match the old one before installation. But since it was idling high after the plug replacement but before the IAC replacement I'd say the wires at the new IAC connection are mixed up. Unplug the IAC and start the engine. If it then idles low, there's the problem. HTH. -Jim

22,285

Do not mess with the iac, you cannot set anything on it prior to installation. I agree, sounds like the wires went spliced together right

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