Question about 2002 Pontiac Grand Prix

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No acceleration 2002 pontiac grand prix-changed plugs and wires, changed fuel fileter, cleaned throttle body, at idle runs fine but won't rev past 3500 rpms. when driving it can't get out of its own way, bogs down and hard to shift. car doesn't code either.

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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.

Posted on Jan 21, 2009

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Check your Fuel Pressure It could be fuel pump or Fuel Pressure switch.

Posted on Jan 18, 2009

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You want me to pay you to tell me how to fix it, then i believe you should pay me to tell you how I fixed it.

Posted on Jan 12, 2009

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1 Answer

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