Resetting the ECU

[Capri306]

Calm down, guys.

Touching the stop screw was probably the first mistake, IMO. But since it's already been screwed with (haha, I made a funny), it's going to need 'resetting' to the factory position. Jeff's method is correct IIRC, straight from the service manual, for doing this. You need to be at the factory setting before tweaking anything else; this is because the throttle blade must be open enough to not bind and yet not diminish the efficacy of the IABV/IAC.

Now that it's in the proper position, the TPS voltage should be measured. I find the easiest way is to use hat pins to pierce the insulation, but hey, to each his own.

As for 'learning idle'? Please, it's a preprogrammed microcontroller there in the EEC-IV guys! It's not 'learning' anything! It's programmed with a value for the engine idle speed, and uses a series of maps and logic to carry out instructions; if the computer can't achieve that idle speed through manipulation of its outputs (actuators in this case), there is SOMETHING else causing it. My money is on a faulty IABV/IAC. I've had them go bad so many times it's not even funny. Too bad you can't just buy that stepper motor on the end of the assembly, but that's the way it goes.