My 87 Cougar is having a little difficulty. When I start it up and after it warms up for a little while the car will idle at a very low speed. Then often times it will go ahead and just die. Would this indicate a bad speed sensor? Also as a side not when this happens the voltage goes down as well.
Voltage drooping is simply because of low engine RPM. Not uncommon.
Knowing what engine/injection system you have would probably help diagnose the problem. If it's the 3.8 with CFI, yes, the ICM is quite possibly dead, but I'd check connections to it first before replacing it. That ain't gonna be cheap, IF you can find it.
Does it idle ok with the IAC unplugged?
Yup that was it, changed the ICM and it is running very well now.
Ok so can a person have the same problem with a 2.3 ltr. I have the same issue after replacing the TPS I am still having problems with it idiling after worm up?
Can any body help
88 T/C 2.3ltr
gillis boost valve