Question about 1988 Chevrolet Cavalier Z24

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My 1988 Chevy cavalier with a 2.8L engine runs great when going down the road but when I approach a stop light it sputters and dies. I am also getting a "MAP sensor circuit" and "Electronic Timing Circuit" trouble codes. I have checked wiring, connectors and vacuum lines and replaced the MAP sensor and crankshaft sensor. Do you have any ideas on what could be causing this problem? It is starting to cost a lot just replacing parts that are good. Thank you

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  • chdetrick Apr 08, 2011

    Great idea, I pulled the IAC off and cleaned it and the port hole as deep as I could. Unfortunately this did not fix the problem. The car runs great at any speed except idle where it will sometimes run and sometimes just sputter and die. Is there a way to test the IAC before I spend the money to replace it? Do you have any other ideas? What about the throttle position sensor?

    Thanks for your help!



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Your problem seems to be the I.A.C. (Idle Air Control) motor. Located on the side of the throttle body assembly, this part is responsible for maintaining proper idle speed when the vehicle is idling. But before you start throwing in a new part, try cleaning the I.A.C. port first. Remove the 2 mounting screws holding the I.A.C. motor. Using intake cleaner spray (not carb cleaner), spray the tip of the I.A.C. motor to remove any deposits, wipe clean. Do the same for the "hole" that the part came out of; use a Q-tip to get in deeper into the port. Get as much of the crud off as possible. Allow excess cleaner to evaporate before starting the engine.

I hope this helps...

Have a great day!!!

Posted on Apr 08, 2011

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  • chdetrick Apr 08, 2011

    Thanks for the idea. I just cleaned the IAC inside and out and it did not work. Is there a way to test the IAC before I go out and spend the money to replace it and find the old one was good. If not I will just replace it? The car seems to run great at any speed but idle where it sometimes idles fine but most of the time it idles very rough and then dies. What about the throttle control sensor?



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Just a thought... Not a mechanic here but my 88 Cav was doing the same thing and I took to shop. I had three fuel injectors that were leaking. It runs like a champ now!! Check your return fuel pressure after you shut it down. Shop said it lost all pressure when turned off and that is how they knew.

Posted on Jul 14, 2011


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