Tuning idle speed circuit

["checksix3" <jetjock11@xxxx>]

>>Well, My problem is not the vacuum its the idle speed motor.<<

They do fail, although it's usually a mechanical failure rather than 
electrical. If so they can be repaired if you have the proper tools.
In fact, if your's turns out to be bad I'd be happy to take it off 
your hands.

There is a straighforward procedure for checking the idle speed 
system and wiring, it can be done at the connector to the ECU. This 
assumes you have everything else (throttle linkage, etc) set up 
correctly. To check *only* the idle speed motor/valve, start the car 
and keep it running. (set the idle manually if needed.)

Disconnect the connector at the ECU and jumper terminals 1 and 4. 
Leave them jumpered and then jumper terminals 5 and 2. Rpm should 
increase. If engine rpm remains unchanged your idle speed motor/valve 
or the wiring to it is bad. 5 and 2 will drive it open, 3 and 2 will 
drive it closed. You could also do this with the motor off the car 
and watch it's response. 

Another way is to remove the tach input signal (push out terminal 12) 
to the ECU. This will set the idle motor to it's default position 
assuming its working. Then see if the car will at least run without 
you having to intervene. There are other ways to test the system 
depending on your skills and available equipment. If you want a 
complete procedure to test the entire system on the car (with minimal 
test gear) contact me off list.