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1993 Pontiac Grand Prix

Tiny
TWESTER
  • MEMBER
  • 1993 PONTIAC GRAND PRIX
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
What makes my car idles at an high rpm and then drop? It has the 3.1 multi port fuel inj mtr in it. I have changed out the map sens and tps as well but is still does it.
Sunday, October 17th, 2010 AT 8:41 PM

3 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
It will do that with a cold engine. If the hvac is turned on, the rpms may be higher. There are other issues that may cause the rpms to go up?
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Monday, October 18th, 2010 AT 12:10 PM
Tiny
TWESTER
  • MEMBER
  • 2 POSTS
It does it when the car is warm as well. However what could be some other reasons could cause it to idle up and down when cold or warm? There are no vac leaks put new map sensor on it and also has good fuel psi. Could it be the ECM perhaps and if so where is it located?
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Monday, October 18th, 2010 AT 10:30 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Passenger side fender panel, underhood, near strut tower.
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Tuesday, October 19th, 2010 AT 9:14 AM

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