1993 Pontiac Grand Prix engine runs rough

Tiny
GJWEST
  • MEMBER
  • 1993 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 174,000 MILES
Engine surges at idle between stalling and 1500 rpm. Strong gasoline smell. I have been told it is a vacuum leak, a bad catalytic converter, map sensor.
Monday, December 15th, 2008 AT 5:45 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi:
It sounds like a throttle position sensor. However, if you smell gas, there has to be a leak. That would be my first concern. Check the fuel lines from the tank to the fuel injection. Also, does the car have multiport injection? If so, check each injector to make sure there isn't an o-ring leaking. If there is, you have a fire hazard, and it could be the cause of your rough idle.

Let me know what you find.
Joe
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Wednesday, December 17th, 2008 AT 10:15 PM

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