2001 Pontiac Grand Am Vibration when idling

2001 PONTIAC GRAND AM
181,200 MILES • 4 CYL • FWD • AUTOMATIC
Avatar
JOHNNYRIMES
  • MEMBER
  • 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
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
MMPRINCE4000
  • CAR REPAIR CONTRIBUTOR
  • 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.
Apr 25, 2009 at 8:14 AM
Advertisement
Avatar
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.
Apr 30, 2009 at 7:22 PM
Avatar
MMPRINCE4000
  • CAR REPAIR CONTRIBUTOR
  • 8,548 POSTS
Start with basics, fuel pressure and spark. Then inspect motor mounts, check EGR etc.
May 1, 2009 at 6:55 AM