2001 Pontiac Grand Am Vibration when idling

2001 PONTIAC GRAND AM
181,200 MILES • 4 CYL • FWD • AUTOMATIC
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JOHNNYRIMES
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  • 2 POSTS
Why does my car vibrtae when idling in drive or reverse, but not when in park or nuetral unless the air conditioner is on.
Apr 23, 2009 at 3:45 PM
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MMPRINCE4000
  • ✓ASE Certified Mechanic
  • 8,548 POSTS
  • ASE Certified Mechanic
You either have an engine miss, bad motor mount, or transmission issue.

If you are not getting any codes, then remove IAC (idle air control valve) and clean it. DO NOT turn ign. ON when IAC is removed.

If check engine light is on, then get is scanned at some autoparts stores for free.
Apr 25, 2009 at 8:14 AM
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UMTEKA
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  • 1 POST
I have the same problem i don't think it is the idle air control valve i had replaced it a couple of months ago. it seems like it gets worse as the engine warms up.Please let me know if you found out what it was johnnyrimes.
Apr 30, 2009 at 7:22 PM
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MMPRINCE4000
  • ✓ASE Certified Mechanic
  • 8,548 POSTS
  • ASE Certified Mechanic
Start with basics, fuel pressure and spark. Then inspect motor mounts, check EGR etc.
May 1, 2009 at 6:55 AM
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