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2002 Buick Century, when stopped car idle really speeds up. Have had this looked at and they can't seem to fix the problem. The last mechanic said there must be a leak somewhere. Any suggestions?
Re: 2002 Buick Century, when stopped car idle really...
It could be a computer control problem, or maybe a vacuum leak. If there are no vacuum leaks you may want to try cleaning the throttle body and maybe replacing the idle control motor.
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It's the "someone is trying to steal me" sensor that plagues us all with GM cars during that time frame. They can program the computer to ignore it, but they charge about $200 for it. It actually occurs as the ignition gets worn, and starts to feel the key a little less, and thinks that someone it trying to pick it.
These are not rebuild-able, they must be replaced if they leak. One that leaks will hiss while the engine is running. The hiss is vacuum leaking, not pressure leaking out. To possibly check it under the hood, be very suspicious of a leaking vacuum line at or near the booster, not the booster itself. It might be bad, but that is pretty rare. The last one I changed I thought was defective because it hissed when I applied the brakes, but a new one did the same thing! :-( If you decide to replace it, you will be unbolting the master cylinder from the unit under the hood, and also unbolting the unit under the dashboard. Of you are really careful, you might not need to disconnect the master cylinder 's brake lines at all, just gently pull/push it out of the way to change the booster. Be really careful not to kink the brake lines. The unit is bolted to the car with usually 2 bolts through the firewall behind the brake pedal.
I have a 2002 Buick Century. The ABS light came on intermittantly. At first it was only around some turns, then eventually it was on most of the time. In addition the actual ABS brakes pumped which was annoying.
I jacked up my car, took off the front wheel, and found an exposed wire on the hire harness. The wire was encased in a black piece of plastic which was supposed to protect it. You can peel back the plastic to look at the wires inside. The exposed wire was interferring with the signal being sent from the speed sensor.
Wrapping the wire and the entire wire harness in black electrical tape solved the problem. Not sure if my fix is going to last too long, but it definately solved the problem.
I posted two pictures on Flickr ... the URLs follow (if they don't get edited out) http://www.flickr.com/photos/36273146@N02/4747740576 http://www.flickr.com/photos/36273146@N02/4747740658
Possibly the EGR valve or TPS sensor if you have CEL codes. Check fuel pressure and if low change fuel filter if it is still low replace the fuel pump I beleive it is suppossed to be 41 to 47 psi. Pretty easy to replace fuel filter the Buick Century has a cover you remove in the trunk to access the fuel pump making the change very easy, if you can fit in the cramped space of the trunk.
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