I have a 2002 Pontiac Grand Prix. Have had trouble with the can being jerky while accelerating. Fuel pump ready 59 psi - Good / Fuel filter new-good / Plugs & wires new-good / ignistion coils-good / air filter -good .. The car idols fine. When you give it gas under a load thats when I have trouble?Adding details will get you a faster solution from experts
Fuel pump.
SOURCE: no acceleration
I had the same problem with one exception. It would rev higher than 3500 but the higher it revved the more it bogged. I had the catalytic converter replaced. I thought I bought a new car. Acceleration is just like new. It was easy enough to test. My mechanic cut a hole in the exhaust pipe in front of the catalytic converter. It sounded like a truck but the acceleration difference was immediate. Easy diagnosis.
The car is hard to shift because the more you press on the accelerator the more the computer for the transmission won't let it shift. Which in turn causes the car to bog more sending more unburned fuel into the catalytic converter. Which in turn causes more carbon build up and more back pressure. Vicious cycle. It will only get worse.
My thermostat caused the entire problem. Thermostat was stuck open, engine never got to operating temp most days. Car burned rich. Bad gas mileage. A lot of unspent fuel being dumped into the converter. Probably have some underlying cause that needs to be addressed. Bad plugs, wires, coil, fuel filter.
SOURCE: car idles rough and stalls
Have you ever changed the fuel filter? If it's not that, and it's not a vacuum leak, it is probably your idle air control valve.
SOURCE: 2002 pontiac grand prix gtp running really rough and puttin
get your catalytic converter checked, i have a 2002 gt model and GM just replaced the old with a new one free of charge. They have been having problems with them clogging up so they extended the warranty to 190000kms or 10 years. had the same issues as you and when it was replaced all was good, even sounded better. hope this helps and I hope you get the same deal as I did. it is not a recall so you have to bring it up to them. Good luck.
SOURCE: 1992 Pontiac Grand PrixPower loss,erratic idle
spark plug gaps are very critical on computerised cars!! [some wont even start!]
distributor module may be breeaking down as temp rises they fail!
otherwise do compression check as it may have valve problems
also check plug leads & injectors aswell as the fuel pump pressure [ could bestarving for fuel]
SOURCE: 1990 Pontiac grand prix bogs down, and wants to
Have you checked the ignition module? More info such as eng size would be helpful to help you.
The fuel filter is located under the car on the driver side, between the front and back door.
Your fuel pressure should be 53-59 p.s.i. Change your fuel filter first and see if it goes up. But like you suspect it is likely your pump. The pump is an assembly with the gage sender included is around $485 retail.
Joe
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