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1995 Geo Prizm - Misses when warm and above 3000 RPM

Tiny
SCOTT F.
  • MEMBER
  • 1995 GEO PRIZM
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 110,000 MILES
I have A 1995 Geo Prizm that runs fine at idle, but when its warm it misses at 3000 - 3500 rpm.

This is unnoticeable until you try to accelerate. Its almost like a rev limiter kicking in, and it seems too consistent to be an overheating coil.

I suspect a faulty fuel pressure regulator. Before I spend a fortune in the wrong parts, is there anything else that can cause these symptoms?
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Tuesday, January 11th, 2011 AT 4:57 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Do you have a check engine light and when was the last tune-up?

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
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Tuesday, January 11th, 2011 AT 6:06 AM

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