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1999 Chevy Prizm slight hesitation

Tiny
MOWGLI84
  • MEMBER
  • 1999 CHEVROLET PRIZM
  • 4 CYL
  • AWD
  • AUTOMATIC
  • 87,500 MILES
I have replaced the coil packs, gave it a tune up, replaced the universal part near the catalitic converter, and the car still hesiitates near 60 mph, used to hesitiate at 45 mph before all these repairs.
The car rattles still when cold.
Monday, July 27th, 2009 AT 11:02 PM

1 Reply

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

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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Tuesday, July 28th, 2009 AT 1:31 PM

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