Question about Cadillac DeVille
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Posted on Jan 02, 2017
Could be carbon build-up on the pistons, causing erratic flame travel in the combustion chamber... 'pinging'...... Decarbon the engine and use a high grade fuel for a few tanks.... also an octane booster can help
Posted on May 15, 2008
Keep an eye on your temperature gauge until we figure this out, just in case & see if it climbs much/any at highway speeds.
Posted on Feb 27, 2009
Wheel bearings are likly and I've changed many to solve this problem but it's esy to pick the wrong one with e vehical jacked and on jack stands suporting the car by the lower control arms ( normal ride hieght) run the car with a driver and listen to ti run , of course theres no load on the powertrain so there will be some lash ( power on to power decline ) cheack up. The roaring noise can be isolated by puting a sounding bar ( long metal rod ( sr=crew driver)) other against the part till the sound is rounded up rear but possible the carrier bearings in the (rear end) front drive. The axel bearings and on some units the carrier bearing thats in the CV axel on the block. Sounding rod will find and change the noisey part. Professional help is a good idea if you can't carry this out saftly
Posted on Aug 19, 2009
If the trans hums, the problem is in the trans and will have to come out for repairs. You say its not the wheel bearings, but thats a real common problem, and also the tires can make noises like a wheel bearing. Have a Professional check it out.
Posted on Nov 09, 2009
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