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2000 Cadillac Deville Runs rough(idles) in park or stopped

Tiny
JTHOMP
  • MEMBER
  • 2000 CADILLAC DEVILLE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 152,000 MILES
Idles rough in park or while stopped in drive."Service engine soon" light blinks.

Thanks,

Jim
Tuesday, February 19th, 2008 AT 2:27 PM

2 Replies

Tiny
ED ARMES
  • MECHANIC
  • 129 POSTS
I can think of 4 things right off hand that could cause this. I will answer in order of least expensive to most expensive.

1. Bad or unplugged vacumn line.
2. Idle Air Control ( IAC ) solenoid. ( Bad connection or bad solenoid ).
3. Exhaust Gas Recirculation valve stuck open. ( Could be just carbon builup, bad connection or bad altogether.
4. Cracked intake manifold or bad manifold gasket.

Let me know what you find and if we were any help, please contribute a little something for the cause.
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Saturday, March 8th, 2008 AT 11:44 PM
Tiny
BUZZSAW
  • MECHANIC
  • 1,198 POSTS
Scan the codes, off and down on the mode button, w/ key in the on position, its probally time to replace the coil packs on top of the valve covers. Would be my guess
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Monday, March 10th, 2008 AT 1:47 PM

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