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2001 Pontiac Grand Am Vibration when idling

Tiny
JOHNNYRIMES
  • MEMBER
  • 2001 PONTIAC GRAND AM
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 181,200 MILES
Why does my car vibrtae when idling in drive or reverse, but not when in park or nuetral unless the air conditioner is on.
Thursday, April 23rd, 2009 AT 3:45 PM

3 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
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.
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Saturday, April 25th, 2009 AT 8:14 AM
Tiny
UMTEKA
  • MEMBER
  • 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.
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Thursday, April 30th, 2009 AT 7:22 PM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Start with basics, fuel pressure and spark. Then inspect motor mounts, check EGR etc.
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Friday, May 1st, 2009 AT 6:55 AM

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