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2002 Pontiac Grand Prix engine light on

Tiny
JAMESTOWN
  • MEMBER
  • 2002 PONTIAC GRAND PRIX
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 179,050 MILES
Engine struggles to stay at idle speed have replace
iga and oxgent sensor and also the Maff and theEgr but still having problems I may have a vacume leak but have not heard or seen any leaks any suggestions will greatly appreciate write back
Tuesday, November 17th, 2009 AT 1:26 PM

3 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
Take car to most autoparts stores and get the codes read.
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Thursday, November 19th, 2009 AT 8:35 AM
Tiny
JAMESTOWN
  • MEMBER
  • 5 POSTS
I have, and the same codes that I have all ready repaired show up.
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Thursday, November 19th, 2009 AT 7:04 PM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
If you have removed and cleaned the IAC, and engine will not idle, you need to get the PCM scanned in live data mode to see if IAC is working, or EGR is on/off and also timing.

Vacuum leaks will normally cause a high idle.

Also possible the throttle plate is carboned up restricting airflow.
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Friday, November 20th, 2009 AT 8:14 AM

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