Question about 2002 Pontiac Grand Prix

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Acceleration problme I have a 2002 Pontiac Grand Prix and it has a very tough time accelerating. I will step on the gas but and the RPM's will go to about 4,000 but will not shift and will not accelerate. It will shift once I let off the gas pedal, and once it has gone through all the gears it cruises fine. The RPM's will waver when trying to accelerate, especially between 2,000 and 3,000 RPM's. I have taken it to my cousin who is a deisel mechanic and he has narrowed it down to not being a transmission problem and it is not the fuel filter. He ran a diagnostic and it has said that the engine is misfiring, but it doesn't seem like a spark plug issue. Does anyone have any ideas?

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  • Anonymous Dec 18, 2008

    I have the same problem with my 02 grand prix. I took it to the shop and had my catalytic converter replace and it is still doing the same thing.

  • kahai kepa Dec 14, 2011

    im having the same prob
    , i have a obd2 code reader and it aint pulling up any codes, but when i pull out the maf sensor the obd2 reads it? , im thinking its a air fuel sensor burned out, but wouldint the codes come up? changed plugs,wires,cleaned maf,cattalytic good,fuel pressure good ,vacuume test good, changed fuel filter, fuel pump, heeeelp!!!im tired of going back to orileys over and over again, im looseing my mind!!

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Driving it like this cause exhaust to push back through the EGR Valve, and it will cause the air sensors to all burn up and eventually burn through the intake plenum. I had to put $500 in parts MAF, MAP, EGR, Fuel Pressure Regulator, Intake Plenum, and the other air sensor that is not held on with tamper proof torques, and the converter, now it is running great!

Posted on Jan 31, 2009

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I have the same car and i had the same problems
I did the same stuffs you did to try and figure it out
The answer, my friend is
REPLACE THE CATALYTIC CONVERTER
My mechanic replaced the catalytic converter and WOW, it runs like a brand new car
The car was getting dangerous to drive and now you touch the gas pedal and it goes
good luck

Posted on Dec 18, 2008

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