88 cadillac sedan deville, 4.5 L v8, fwd, cruise. On board diagnostic say idle speed control motor rpm out of range (E30), do i need to replace, can i adjust, or is something else the problem, please help

yes, you can adjust. find the TB and on the back there's a little black box with some screws in it. loosen those and go into diagnostics with your isc reading and adjust until you have it to 13.....

wait, or it that for the tps?? dang...somebody else?

Before you replace or adjust anything, make sure that the ISC motor is working properly.
THis could be a motor failure or binding or possibly an electrical issue.

I don' know the specifics on your car. On my 85 Eldo with 4.1 engine I can go into a solenoid cycling mode. That extends and retracts the ISC plunger. If that works, then it might just need an adjustment. If that fails, you have to do some more troubleshooting.

You should really get the original Factory Service Manual. It guides you step-by-step on what to do for those codes in order to pinpoint the problem.

No Chiltons manuals ! :)

If you work on your car you must have the Manuals ! Cars are way too complex nowadays to just fix them by tweaking stuff here-and-there...

Maybe someone here with the same engine as yours can offer additional hints.
Peteski

Probably replacing the idle speed control motor will fix the problem.


Use the search feature in the forum tool bar...type "idle speed control" or "idle speed control motor" into the subject drop down box and read my posts. Lots and lots of ISC info previously posted.

thanks for the help everyone