1995 Pontiac Firebird Hesitation, stumbling only when resta

Tiny
FIREBIRD95
  • MEMBER
  • 1995 PONTIAC FIREBIRD
  • V8
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
Hello. I have a '95 Firebird that runs like a dream (100+ MPH) except when the car has been driven until it has warmed-up, shut down for 30 minutes or so then restarted. It restarts fine, but it hesitates and stumbles badly; I'm afraid I'm going to get rear-ended if I can't get the problem diagnosed. The Check Engine light does not come on. I have had the Ignition Coil and Module replaced, along with a temperature switch. I had a tune-up @ 100,000 miles, but I notice they did not replace the distributor. Before I had the coils and module replaced, I noticed a faint burning plastic odor and the mechanic said that the coils showed signs of slight melting. I can't afford to replace the car a piece at a time to locate the problem. Any direction you can provide would be appreciated. Thank you
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Tuesday, March 2nd, 2010 AT 7:57 AM

4 Replies

Tiny
RASMATAZ
  • MEMBER
Inspect and test all the following listed below and get back with some results

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position 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.
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Tuesday, March 2nd, 2010 AT 10:37 AM
Tiny
FIREBIRD95
  • MEMBER
Rasmataz, thank you very much for your response. Are you able to advise which I should request be checked first, with the knowledge that the problem only occurs once the car has been driven for at least 30 minutes, shut down and restarted? The problem only occurs when the engine is warm. I forgot to mention that the fuel pump has been checked and it appears to be fine. I also had the fuel filter replaced. If you are able to priortize the list by most likely to occur when the car is warm I can hopefully reduce the diagnostic charge. Thanks again so much
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Tuesday, March 2nd, 2010 AT 12:18 PM
Tiny
RASMATAZ
  • MEMBER
Throttle position and manifold absolute pressure sensors
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Tuesday, March 2nd, 2010 AT 12:22 PM
Tiny
FIREBIRD95
  • MEMBER
Thank you!
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Tuesday, March 2nd, 2010 AT 12:36 PM

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