Question about 1994 Cadillac DeVille
Check for clogged fuel injectors or fuel filter, and check for bad fuel pump
Posted on Nov 07, 2012
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Posted on Jan 02, 2017
The "check engine" light will "light" when there is a malfunction in the engine management system. The fault code is then stored in the computer. The computer must be scanned to retrieve these stored faults to pinpoint the malfunctioning component. We recommend buying your own scanner and doing it yourself. With a pocket scanner you can check for fault codes to find out why the light came on in the first place. You can clear your cars trouble codes after you replace the malfunctioning sensors.
Posted on Jun 26, 2008
SOURCE: 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
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.
Posted on Sep 21, 2009
Testimonial: "thx..my car is not overheating.only had to pull off road once.it does get to 233 sometime."
Had a computer on my 1990 Cadillac Deville bad, after changing plugs, wires, cap, fuel injectors, egr valve, etc.
The computer was not firing an injector and i had a miss and rough running mostly at 35 mph on the roads. It bucked like a bull.in a rodeo.
Posted on Jul 02, 2010
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