Question about 2002 Pontiac Grand Prix

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No passing gear

Transmission will not drop into passing gear. The RPM's will race up to near shut off point and the car acts like it is in neutral. The service engine soon light will also flash then turn off soon after I release the gas peddle. If I drive normal the car will go as fast as I want but as soon as I get aggressive and push the peddel to the floor it will not respond. Starting from a stop and pushing the peddel to the floor the car will respond and go through the gears. I have thought of changing tran fluid but is this a tran rebuild or maybe a sensor. Please help.

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  • us4keos Jan 29, 2009

    Thanks, I will look into the catalytic converter. I recently ruled out a bad transmission, so I was going to try a simple tune up since the car is pushing a 100k.

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My car did (past tense) the same thing. The service engine light is flashing until you let off the gas because raw fuel is being dumped into the catalytic converter. The transmission won't shift because the converter is plugged. When you push the pedal to the floor the transmission computer holds the transmission in gear. Meanwhile the engine computer is raising the rpms. It will seem like a transmission problem but it is more likely a plugged catalytic converter. I had converter changed. The engine has A LOT more power, great acceleration and the transmission shifts perfectly.

Posted on Jan 29, 2009

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lost engine power, or transmission slips????
which is it?
the engine rpm tells you if the engine is weak or transmission slips.
2.0 liter , DOHC I4, J20 engine.
which transmission, my guess A/T box. (sounds like?) sure..
test one
1: in drive. pointed in safe direction, say a field or ?
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1,2,3,4? yes/ .no.
yes, the its not the transmission.
if engine power lacks in any gear, that is the engine. weak.

this post is about the engine power, (my answer)
will you change 100 more parts guessing?
why do that?, any shop can diagnose it for a fraction of your guessing.

if the trans dont slip
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  2. never done a tuneup this decade?> really?
  3. low fuel pressure?
  4. low engine compression.?
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  6. check engine light on running?, why ignore that, scan it.
  7. weak spark , see #2 and 6
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  9. Intake vacuum air leaks>?


both the engine and transmissions are complex
as is the vast number of tests to do. based on previous tests and logic.
do you want to test or gue$$?


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try to push car in neutral on flat ground, can you>
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