MY 99 CADILLAC DEVILLE HAS DEVELOPED A PROBLEM WHERE THE ENGINE RPM'S WILL INCREASE FOR NO APPARENT REASON. WHEN IT DOES THIS, THE CAR WILL ACCELERATE WITHOUT ME TOUCHING THE GAS. WHEN I AM BRAKING, THE ENGINE RACES AND I HAVE TO STAND ON THE BRAKES. I USUALLY TURN THE IGNITION OFF AND RESTART THE CAR. SOMETIMES THE RPM'S WILL GO DOWN BUT SOMETIMES IT DOESN'T. WHAT COULD BE WRONG? IS IT SOMETHING IN THE
COMPUTER? PLEASE REPLY.
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The 1997 V8 engine in the car is fitted with coil packs which are quite visible on the top of the engine. These need to be replaced when they eventually fail as is common.
Here is a video on the coils which may help you.................
HAVE YOU CHECKED YOUR COOLANT HOSES? CHECK TO MAKE SURE THERE NOT LOOSE OR CRACKED. ANOTHER THING COULD BE IS YOUR HEATER CORE HOSES COULD BE BAD. ALSO I WOULD CHECK YOUR RADIATOR CAP THE SEAL COULD BE BAD. I HOPE THIS HELPS YOU WITH YOUR TROUBLESHOOTING.
Make sure your engine is breathing properly, by regularly changing air filters. Flush your cooling system once each year and pressure test. There are cooling lines that cross over the rear of the engine that get corroded and may begin to weep antifreeze..you can view these lines by removing the engine cover....if you've had a consistent odor of antifreeze after running,with no drippage evident, this area is probably the culprit.....love my 99...
poor choice if purchased. The head bolts tend to break and to have it repaired is very costly for they are slender and long. . A 99 Cadillac is too old for they have many modules operating this vehicle and the shocks themselves run nearly $1000 each. Back off on this deal
I have a 97 Cadillac Deville with a northstar engine and have replaced it twice so far, so i answer this by experience...i've noticed to my two prior engines that went bad that the normal temp should NOT EXCEED 228 (normal), the red overheating light will come on at 250 and at 260 it will beep and tell you to stop engine - idle engine and will begin to smoke (overheat).
I hope this helps you and anyone else...by the way if your asking why did i replace my engine twice is simply because my cadillac is super clean inside and out, immaculate condition.
If memory serves me correctly... the 05 deville is equipped with "Magnasteer" the electical connector at the rack and pinion is not a pressure sensor unless its on the line itself. The system operates by inducing voltage to magnets in the rack to make turning easier at lw speeds while adding resistance at higher speeds for added control and less drift. Check for any codes on your climate control by pushing "off and warmer" at the same time with the engine off, key on. Google the codes and see if any relate to the steering system and repost!
I hope that helps!