1998 Pontiac Sunfire 4 cyl Front Wheel Drive Automatic 135, 00 miles
My daughter and son-in-law is having trouble with their car. He has replaced the cams, exhaust carrier set, intake carrier set, timing chain, gears, throttle postition sensor, map sensor, cam sensor, iac valve, fule pressure regulator, replaced all the vacuum hoses, new water pump and thermostat.
Replaced top of motor because it had a lifter knocking on intake carrier so they replaced them both.
It runs at 1000 rpms for a few seconds but then drops to 500. When open the throttle just a little it runs fine. He rigged it up with an air flow valve from an air compressor it runs. The IAC valve is doing the opposite of what it should be doing, when started the car the valve closes all the way but when shut off it opens all the way.
The cooling fan turns on when the engine is cold and turns off when the engine is hot. The temperature gauge is fine.
He's tried to reset the valve, tried to get it to relearn idle by shutting off, waiting, accelerating, deccelerating, etc. As someone else told him to do.
He hates to give up on that car, he's put so many hours into trying to get it to work and they can't afford another car. He's 19 and my daughter's 21, they have a 6 month old and are living with me. I'm on disability because of my neuromuscular disease and am bedbound on homecare and oxygen now and can't afford to help them out.
He's really smart and can do about anything on the car if you could help we would greatly appreciate any ideas. He's thinking of replacing the PCM, but since he replaced the top of the motor, and I think it has sensors on it, could that be the problem or would a new one set to the VIN just do the same thing? We don't know what to do.
Thank you & God bless you all and your familes, Lisa
have the same problem?
Monday, April 20th, 2009 AT 9:43 AM