2003 Pontiac Bonneville



May, 17, 2010 AT 3:15 PM

Engine Performance problem
2003 Pontiac Bonneville 6 cyl Front Wheel Drive Automatic 135000 miles

I have a problem the car seems to hesitate a little when I am driving at between 40 and 60 mph. It seems to happen when I am going up a hill, but not necessarily very steep.

The car will hesitate or lurch once or twice and then keep on going. Is this a fuel system problem or the transmission or something else?


1 Answer



May, 17, 2010 AT 3:41 PM

Hi harmsray, Welcome to 2carpros and TY for the donation

Lack of acceleration, chugging, hesitating, bogging etc. Could be caused by one of the following below.

Inspect and test: Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position 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.

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