Last post on Sep 11, 2012 at 3:39 AM
You are in the Cadillac DeVille
What is this discussion about?
Cadillac DeVille, Lights, Electrical, Sedan
#184 of 191 2001 Deville
Jun 17, 2011 (10:50 am)
I purchased this car recently as a used car. It was driven by an older guy who took good care of it. The problem that I am having is oil consumption. I have only driven the car 1000 miles since I got it. It had 65,000 when I bought it. Is this common with the Northstar engine of that generation? If so, what causes it?
#185 of 191 Re: 2001 Deville [temj12]
Jun 19, 2011 (3:44 am)
Carboned up, stuck rings from people 'taking care' of it. The Northstar needs to be driven aggressively occasionally to not have and/or cure this problem. Stuck rings will cause massive (a quart every 600 miles) oil consumption. And, just driving it fast (70mph on the freeway) will not cure it, and will not keep it from carboning up.
Take the car out on a highway with light traffic. You don't have to be stopped, a rolling start at 5-10 mph is fine - then floor it (keep it floored, make it shift at redline) thru two upshifts - you will probably be going 80+mph at this time, so a ticket is your problem, don't complain to me. Then let the car 'coast' back down to 10 mph, and do it again. Do this 4 or 5 times and you will probably break a lot of the carbon out. And reduce the oil consumption by a lot.
I had a 95 Concours with the Northstar and it suddenly was taking a quart in 600 miles. And it developed a 'carbon knock' which sounds exactly a stuck lifter. A carbon knock is when the carbon in the piston get high enough to actually strike the head (or a valve) at the top of its motion. A few of these Wide Open Throttle (WOT) runs took it back up to about a quart in 2500 miles and the carbon knock went away.
Cadillac has a service procedure for this problem. It involves removing all the plugs and pouring in a solvent and letting it sit for 2/3 hours. Then sucking it out with a special tool. Then they take it out and run it aggressively, and then give it an oil change. I don't know what they charge for this, but it will not be cheap.
I know this sounds like a 'shade tree mechanic' fix, but it works. And it shouldn't hurt the car. If you break something, it was about to break anyway.
The Northstar was designed as a 'sport car motor', and puttering around in one, using premium gas which is actually harder to ignite than regular, will carbon up the motor badly.
#186 of 191 Re: electricall issue [alimo130]
Jun 19, 2011 (5:55 pm)
boliva thanks will look at the door boot.
Jul 06, 2011 (10:58 pm)
Just purchased a 1992 Deville. Both brake lights came on, then the check engine light. Called the dealer and they said it was nothing to worry about. A week later the car stalled and I had to coast to a stop. When I turn the key the engine ignites but will not stay on. Ended up being towed home. Does anyone know what the problem could be?
#189 of 191 Re: If you can solve this, you are a Cadillac god. [dtstl]
Sep 10, 2012 (10:16 pm)
Did anyone ever come up with a solution to this problem. I have the exact thing going on with my 2002 Deville. In addition, my traction control light is on.
#190 of 191 Re: If you can solve this, you are a Cadillac god. [sqiii]
Sep 11, 2012 (3:18 am)
I have a 2005 DeVille. I had my traction control light come on several months ago. I could not turn it off manually with the button. At first I thought there was something wrong with the traction control. Took it in to dealer. There was a short in a wire that goes to the truck for the third brake light. I guess opening and shutting the truck will eventually pinch the wire. Hope this helps some.
Sep 11, 2012 (3:39 am)
I have a 2002 DeVille and had similar problem, it was the harness connection which sits in the engine compartment. I will look for the name of the part but according to GM the wiring to this part was too short and sometimes it pulls slightly and the connection does not make full contact and it gives off false reading and it stalls the engine
I will get back to you .