Question about 1999 Cadillac DeVille

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My 99 deville has a rough idle at stops and had been overheating until replace intake gaskets. could it bea timing problem and how would one fix that?

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Give these websites a try www.autozone.com and www.alldatadiy.com if all fails stop your local library and get your hands on a Haynes auto repair manual for your car if it was me i would give these guys a call they only sells GM-parts its Schram auto & truck parts 1-800-292-1032 and they website is www.schramauto.com wish you the best of luck Michigan Man.

Posted on Nov 15, 2009

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2000 Saturn SL2 runs fine until stopped at a stop sign, etc., then it seems to idle rough - what could be causing this problem? Was told, maybe old gas since it had been sitting for about 4 months.


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99 deville head gasket leak?


A head gasket leak is usually indicated (among other things) by continous overheating of the motor, and subsequent loss of coolant.
It can also be indicated by the presence of engine combustion gas bubbles in the coolant resevoir.
Ensure the coolant system has no external leaks, such as faulty hose/s, radiator etc.

Ensure motor tune or other motor mechanical condition is not the cause of overheating.
I assume the motor is actually running hot.

Check cooling fans are operating ok (as necessary when car warms up):- if not check
1) fuse,
2) relay operation,
3) heat sensor switch.

Check/replace the thermostat,
Check the coolant pressure cap is serviceable & of correct rating,
Ensure cooling system is correctly filled, bleed off any airlocks as necessary when re-filling,
Ensure radiator hose on suction side of waterpump is not collapsing at engine revs above idle (due softening),
If the motor has been severely overheated, the head gasket could be blown - look for combustion gas bubbles in the coolant resevoir.

Sep 21, 2009 | 1999 Cadillac DeVille

1 Answer

Rough idle after check engine code cleared


I would check for any vaccum leaks,
You can take a spray bottle of water and spray around the intake manifold with the car running at idle.
The idle will change and get worst if the intake is leaking.
The intake gaskets could be the failure. I know autozone can get into the computer and clear the codes for free.

good luck

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I HAVE A 1999 DEVILLE


99 cadillac deville overheating put in new radiator,thermostat,waterpump. it stays cool at idle for a hour running.drivin about 15-30 minutes it overheats. is not using hardly any coolant to speak of.

Jan 05, 2009 | 1999 Cadillac DeVille

1 Answer

99 Deville coolant issues


do you have a cloud of white smoke out of the tail pipe?

Dec 23, 2008 | 1999 Cadillac DeVille

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