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1993 Cadillac Deville

Tiny
1991MX6
  • MEMBER
  • 1993 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 140,000 MILES
Irregular idle. It revs itself from idle to 2000 rpm, up and down.
Saturday, May 23rd, 2009 AT 7:27 PM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Clean out the idle air control valve, EGR and PCV valves and see what happens-might also want to check fuel pressue.
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Saturday, May 23rd, 2009 AT 7:29 PM
Tiny
1991MX6
  • MEMBER
  • 2 POSTS
I just replaced the PCV and fuel pump. You think the EGR is the culprit?Im sure its old. THANK YOU for your time and knowledge. Its sincerely appreciated.
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Saturday, May 23rd, 2009 AT 7:52 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Did you cleaned out the IACV if not clean it along with the EGR valve and see what happens.
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Saturday, May 23rd, 2009 AT 11:16 PM
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
It does not have an IAC valve, It is ISC motor with nose switch that senses throttle at idle. You might try cleaning the engine ground, and performing a minimum idle/tp adjustment and idle learn.
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-1
Sunday, May 24th, 2009 AT 12:03 PM

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