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1992 Buick Park Avenue hesitates

Tiny
MYCOM1
  • MEMBER
  • 1992 BUICK PARK AVENUE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 66,000 MILES
Car hesitates when pulling off. I have to pat the pedal to accelerate. Sometime I hear a small pop.

@ highway speeds I must pat the pedal to gain speed.
Monday, August 31st, 2009 AT 12:15 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be caused by the following:

Oxygen sensor
Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
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Monday, August 31st, 2009 AT 12:21 AM

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