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1993 Buick Regal acceleration

Tiny
RCHAMP47
  • MEMBER
  • 1993 BUICK REGAL
  • V8
  • FWD
  • AUTOMATIC
  • 129,400 MILES
The engine bucks when you accelerate hard. It seems to happen at speeds of 50 mph or higher.
Saturday, November 7th, 2009 AT 3:54 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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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Saturday, November 7th, 2009 AT 4:14 PM
Tiny
JEKYLLANTERN
  • MEMBER
  • 2 POSTS
Did you ever get this fixed? My car has the same acceleration problem at 50mph and higher.
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Friday, April 29th, 2011 AT 12:09 AM

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