I'm trying to help someone out with his 87GT. There are two wires going to the IAB red for +12v and white/blue which goes to pin #21 on the computer, I tested those and they're okay. HOWEVER there is ANOTHER white/blue wire which also leads to pin #21 (don't know where it's connected at this point - in the engine harness) this white/blue wire which touches the ground circuit to control the IAB is welded to the POSITIVE 12 VOLT red wire but using a diode... I've never seen this. I tested the diode and it's dead.
The car will jump to 3000rpm when started and will stall out once warmed up. I checked the TPS, IAB, MAF, ground, ground to HEGO. I checked everything in the surging idle thread. I even checked the MAF conversion that was done to the car. Oh and when I unplug the IAB the car idles okay. It does have a B303 cam though.
thanks for any ideas you guys may have
The car will jump to 3000rpm when started and will stall out once warmed up. I checked the TPS, IAB, MAF, ground, ground to HEGO. I checked everything in the surging idle thread. I even checked the MAF conversion that was done to the car. Oh and when I unplug the IAB the car idles okay. It does have a B303 cam though.
thanks for any ideas you guys may have