Re: HIGH Idle
"camaroken" has not returned to the site in 6 years, so not likely he will reply.
To me, it sounds like a defective coolant temp sensor. If the ECM thinks the engine is very cold, it raises the idle RPM and richens the A/F mixture. |
Re: HIGH Idle
Originally Posted by Injuneer
(Post 6982713)
"camaroken" has not returned to the site in 6 years, so not likely he will reply.
To me, it sounds like a defective coolant temp sensor. If the ECM thinks the engine is very cold, it raises the idle RPM and richens the A/F mixture. |
Re: HIGH Idle
Actually, I think you would be better off starting your own thread.... there is a lot of bad info in the posts above.
You indicated the check engine light came on. What is the code? Have you checked the coolant temp sensor resistance vs. temperature to verify it's accuracy? Have you checked for the correct voltage on the black and yellow wires to the coolant temp sensor (sensor unplugged)? Have you checked the resistance of the coils in the idle air controller for continuity? Contrary to what is posted above, the IAC does not set a code if it is faulty, and there is no feedback to the ECM indicating whether it is working correctly or not. Unplugging the IAC won't change anything. It is a pintle, controlled by a "stepper" motor. Pulses from the ECM open or close it in steps. If you unplug it, the pintle will not move, just stay where it was last positioned by the ECM. This is 4th Gen/LT1 stuff, but the principles are similar: 4th Gen LT1 F-body Tech Articles http://shbox.com/1/iac2.jpg Finally, have you verified that the throttle stop screw is not extended out too far, holding the blades open to the point where the IAC can no longer control the idle? Have you verified that the cable or the throttle quadrant is not hanging up, leaving the blades open? |
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