Cadillac DeVille Problems

Rough Idle Due to EGR Valve Sticking Open on Cadillac DeVille

Problem Description and Possible Solution

The EGR valve may stick open, causing a rough idle and/or the Check Engine Light to illuminate.

(89 people reported this problem)

Cadillac DeVille Vehicles With This Problem

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Average mileage: 114,193 (35,800–220,000)
Engines affected: 4.6L V8, 4.9L V8
14 model years affected: 1991, 1992, 1994, 1995, more1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
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Viewing 1-19 of 19 comments
My engine idles high when I start and idles down after a few minutes what may be the problem
When at a stop the engine idols very high trying to move forward when put in park it reves very high
having this problem right now. its hard to control the car when this happens and the mechanic can't fix it unless I can get it there so he can see/hear it. it usually dies down by the time I get there, but it returns randomly.
about the EGR i have the same problem.... the EGR is 150.00 200.00 never buy used from a junk yard or clean them i did both and lost money. you have to buy new!
Harsh start egr sticking open can't solve disfunction. I did a parsidic draw test and found out it was my comfort fuse draining my battery. Well, I started pulling it every night and everything was working good new egr valve and battery give or take 2 months car starts acting up even with fuse pulled.
Rough idle at a stop or redlight check engine light came on doesn't always do it randomly if you turn engine off may stop it