Mechanics

HESITATION

2003 Pontiac Bonneville

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?
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Harmsray
May 17, 2010.




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.

Rasmataz
May 17, 2010.


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