Crossfire TBI IAC to 7.4L TBI IAC Conversion
Crossfire TBI IAC to 7.4L TBI IAC Conversion
I have been struggling this this for a year. I have a 1984 Crossfire Vette. I believe the wiring to IAC is identical to CF F body. I presume?
I was give a couple of wiring suggestions from crossfire forum but did not work. What is happening is the 7.4 IAC is functional but not correctly. Some wiring combo will retract the pindle opposite of what it should be. IOW as coolant temp rises it adds steps/retracts. Or it allows a fast idle on cool coolant and then continues to retract as temp rises. The EBL-ECU is sending signals to the IAC based upon coolant temp. That i have determined. Key on I dont recall it cycling? The IAC(new) and does OHM out correctly.
This is the pinout from ECU per Haynes manual:
green white pos 12 stepper coil B high
blue black 18 A low
blue white 17 A high
green black 13 B low
I think I need the same from a 1995-1996 7.4L TBI truck. But the ECU may vary?
Thanks for your help!
I was give a couple of wiring suggestions from crossfire forum but did not work. What is happening is the 7.4 IAC is functional but not correctly. Some wiring combo will retract the pindle opposite of what it should be. IOW as coolant temp rises it adds steps/retracts. Or it allows a fast idle on cool coolant and then continues to retract as temp rises. The EBL-ECU is sending signals to the IAC based upon coolant temp. That i have determined. Key on I dont recall it cycling? The IAC(new) and does OHM out correctly.
This is the pinout from ECU per Haynes manual:
green white pos 12 stepper coil B high
blue black 18 A low
blue white 17 A high
green black 13 B low
I think I need the same from a 1995-1996 7.4L TBI truck. But the ECU may vary?
Thanks for your help!
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