2002 Pontiac Grand Prix engine light on

2002 PONTIAC GRAND PRIX
179,050 MILES • 6 CYL • 2WD • AUTOMATIC
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JAMESTOWN
  • MEMBER
  • 5 POSTS
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
Nov 17, 2009 at 5:26 AM
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MMPRINCE4000
  • ✓Experienced Mechanic
  • 8,548 POSTS
Take car to most autoparts stores and get the codes read.
Nov 19, 2009 at 12:35 AM
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JAMESTOWN
  • MEMBER
  • 5 POSTS
I have, and the same codes that I have all ready repaired show up.
Nov 19, 2009 at 11:04 AM
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MMPRINCE4000
  • ✓Experienced Mechanic
  • 8,548 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.
Nov 20, 2009 at 12:14 AM
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