SPONSORED LINKS

1991 Cadillac Deville Idle problems

Tiny
SKMILLER
  • MEMBER
  • 1991 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 11,600 MILES
I have a problem with extreme rough idling and rough running until the car reaches 55-60mph. The car has had a tune-up, which the place where it was done messed up by crossing plug wires. Even after the plugs were properly wired, with two having to be replaced, it still is idling and running rough. The mechanic has tried everything he knows and gets no alert or warning on the computer. When the tune-up was done they also replaced the IAC motor. Could this problem be caused by the motor possibly being bad or some sensor or something not being set correctly?
SPONSORED LINKS
Tuesday, August 19th, 2008 AT 3:22 PM

3 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
When you turn the key to the on position, does the service engine soon light work?
Was this
answer
helpful?
Yes
No
+2
Tuesday, August 19th, 2008 AT 3:27 PM
Tiny
SKMILLER
  • MEMBER
  • 2 POSTS
The car has been in the shop for two weeks now but I think the light did come on. I know it did for a few seconds when I started the car.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
+1
Tuesday, August 19th, 2008 AT 3:46 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
At this point if it runs as bad as you are saying, it should have stored codes, By crossing the wires it may have caused problems in the coil, or ignition module.
Was this
answer
helpful?
Yes
No
+1
Tuesday, August 19th, 2008 AT 4:18 PM

Please login or register to post a reply.

Related Engine Idle Erratic Content

Vacuum Leak Test and Repair
VIDEO
Vacuum Leak Test and Repair
Instructional repair video
Idling High
GUIDE
Idling High
Intermittent sensor failure or shorting can cause the computer to act strange with unusual side effects, these problems are particularly tough to diagnose. The computer...
VIEW MORE

Sponsored links