Question about 2002 Cadillac Deville
I have a 2002 Cadillac DeVille with 131,000 miles on it. It has the 4.6 NorthStar motor and digital dash. Recently, when I pulled in my driveway and put it in "Park" the RPM's raced to like 1800 RPM. I tapped the accelator thinking maybe the choke was stuck or something, and it rev'd even higher to 2300 RPM. After about 30 seconds it slowly came back down to normal RPM's in the 625 range. I shut it off and wrote it off. Today it did the exact same thing to me. Only this time, after I started it again it died. I started it again, it died. AND again only this time I pressed on the accelerator and it started cutting out. Finally it ran ok. It also seems to be getting horrible gas mileage. 12.5 MPG average. Any clue what might be the problem here? Any input would be greatly appreciated.
These cars are notorious for intake manifold leaks. This could also be a throttle position sensor. If you have a MIL (check engine light) I would scan it with an OBD II scanner and pull the relevent code off the scanner it will give us a much more accurate direction to proceed
Posted on Feb 01, 2009
Check the EGR valve. if the valve gets stuck open the rpms will rev up to prevent the car from stalling. this will happen if the car has been driven on the highway for a extended time on lower mileage cars. sometimes you might also notice that the ac cuts out after long highway driving when the valve sticks open
Posted on Feb 01, 2009
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Sep 21, 2016 | 1997 Cadillac DeVille
Feb 03, 2016 | 2004 Cadillac Deville
Jan 25, 2016 | Cadillac Cars & Trucks
Dec 29, 2015 | Cadillac Cars & Trucks
Aug 11, 2014 | 2002 Cadillac Deville
May 17, 2011 | 2002 Cadillac Deville
Feb 04, 2010 | 1998 Cadillac DeVille
Jun 10, 2009 | 1995 Cadillac DeVille
Dec 15, 2008 | 1994 Cadillac DeVille
872 people viewed this question
Usually answered in minutes!