bad engine performance

2001 PONTIAC GRAND AM
106 MILES • 6 CYL • FWD • AUTOMATIC
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CHRISTOPHER LIEURANCE
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  • 1 POST
my 2001 Grand Am bogs down under load and takes a long time to reach highway speed. if I give gas at highway speed, it downshifts but doesn't go. using alot more fuel too. Thanks
Jan 25, 2011 at 9:57 PM
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RASMATAZ
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  • 75,992 POSTS
Lack of acceleration,chugging,hesitating********,bogging,misfiring etc. could be caused by one of the following below

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it and keep testing.
Jan 26, 2011 at 2:59 AM
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