1990 Cadillac Deville V8 Front Wheel Drive 130000 miles
Cadillac DeVille 1990 130,000 miles scrupulous maintenance 4.5 L code 3 fuel injected
Engine vibrates; frequency proportional to speed and accelerator depression; coast smooth.
Two episodes. First no trouble light. resolved spontaneously. GM dealer tuned engine ... smooth. Checked compression one cylinder lo.
Underwent $500 tune up.
Several days later vibration as above this time with trouble light on and dealer verified vibration this time. Passenger can feel vibration.
Dealer could not identify a code. Suspect warning light intermittent. Checked more compressions. several low.
No antecedent symptoms; no oil usage. No blue exhaust smoke. Pristine outside and interior.
GM dealer says we need new engine.
Hard to believe because sudden onset; it has come and gone and now come back. Interim smooth as silk.
Two perhaps unrelated observations:
Two weeks earlier someone removed gas tank cap ... purchased a new one promptly; could something have been added to tank?
In earlier years trouble light meant a new oxygen sensor was required ... although auto was running smoothly ... light only symptom.
Like the car.
Desperate for advice.
Cadillac DeVille 1990 130,000 miles scrupulous maintenance 4.5 L code 3 fuel injected
Engine vibrates; frequency proportional to speed and accelerator depression; coast smooth.
Two episodes. First no trouble light. resolved spontaneously. GM dealer tuned engine ... smooth. Checked compression one cylinder lo.
Underwent $500 tune up.
Several days later vibration as above this time with trouble light on and dealer verified vibration this time. Passenger can feel vibration.
Dealer could not identify a code. Suspect warning light intermittent. Checked more compressions. several low.
No antecedent symptoms; no oil usage. No blue exhaust smoke. Pristine outside and interior.
GM dealer says we need new engine.
Hard to believe because sudden onset; it has come and gone and now come back. Interim smooth as silk.
Two perhaps unrelated observations:
Two weeks earlier someone removed gas tank cap ... purchased a new one promptly; could something have been added to tank?
In earlier years trouble light meant a new oxygen sensor was required ... although auto was running smoothly ... light only symptom.
Like the car.
Desperate for advice.
Oct 1, 2009 at 2:50 PM