2005 Buick Century hesitation

GOLDGOAT

MEMBER
2005 BUICK CENTURY
6 CYL
FWD
AUTOMATIC
140,000 MILES

My car hesitates, I have had the EGR valve replaced. I have had the fuel filter replaced.
I have had a tune up. Tjhe fuel pressure was checked and varied somewhat. Car hesitates at about 50 to 58 MPH then smoothes out for awhile, but subtle hesitation stays. When I am going up a hill I have to depress the accellerator hard to get the car to not lose speed.

During the first forty seven thousand miles the Fuel Pressure Regularor Gauge was replaced 5 times. At those times the only thing I noticed was wherring noise coming from the engine compartment.

Should I replace this gauge now? I have 140,000 miles on this car. It has always got between 30 and 33 mpg but now is 25 to 28 mpg.
thanks

Friday, January 28th, 2011 AT 10:30 PM

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

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.

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Friday, January 28th, 2011 AT 10:33 PM