Question about 2000 Pontiac Grand Prix
I have a 2000 Pontiac GTP (sc), 6 months ago, car stopped in the middle of the freeway for no apparent reason. Mechanic friend messed with car for awhile and as a last resort unplugged my Mass Airflow Sensor. As soon as this unit was unplugged, car ran perfect (even got better gas mileage oddly enough) Recently the CEL came on. CEL code stated I had a bad Mass Airflow sensor. Changed sensor, plugged it in... car wouldnt start! JOY!. However, car will run without the unit unplugged perfectly fine.
On top of this, the car has now started this wonderful ''shaking'' only when the car is in drive. Every once in awhile, when i release my foot off the gas pedal the RPM gauge will also randomly shoot from 1000 to 4000 and rock back and forth shaking the car while it does this until i place my foot back on the gas pedal again...
It almost sounds like a fouled fuel injector. this is a tricky problem because it involve so many different operations. the maf is used to deliver fuel and the o2 sensor tells how much. there are 2 o2 sensors one before cat 1 after. mabey check these out visually. the computer should pick these sensors up if there bad. is this a supercharged engine? ill try to come up with some other ideas for you soon.
Posted on Mar 12, 2009
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Posted on Jan 02, 2017
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