Question about 1998 Chevrolet Cavalier

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Recently did a tune up and fuel filter and the car is still running really bad

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ASE Mechanic:
did you replace spark plug wires? If so I would tend to think that may the wires got mixed up, common thing for a doityourselfer to do. I have done it too!!!!!!! But a IAC cleaning is only good for a small rough idle. To me it sounds like something else is still wrong. Check fuel pressure and volume, if that was the first fuel filter since the car was new you might looking at a fuel pump, and fuel pressure regulator. Sometimes too that coil pack has issues with the ignition module. make friends with local parts guy, sometimes he takes returns.

Posted on Jan 27, 2009

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Check the IAC Idle control valve. See if cleaning the valve will make a difference. Buy some carburator cleaner or brake cleaner.Take off the air cleaner duct work that goes to the fuel system. Look inside the hole going to the fuel sytem. You will see some holes on the cylinder sides. Two of these holes are the IAC Valve. With the car running at about 1200 rpms spray the cleaner aiming straight into the the holes on the side. Give it a good ten seconds of spray. next, turn your engine off and let the cleaner soak for a while. Repeat the process a few times. This should clean the valve. It can also be removed from the side and cleaned. If cleaning does not do the job, replace the IAC. Hope this helps you.

Posted on Jan 22, 2009

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