This 1985 Cadillac Seville factory service and repair manual is matched to this exact model year and trim, so the specifications and procedures inside are the ones Cadillac published for your Seville, not figures borrowed from a nearby year.
Engines covered
- 4.1L V8 (250 cu in) — OHV, naturally aspirated, gasoline
- 5.7L V8 (350 cu in) — OHV, naturally aspirated, diesel
Body styles covered
- 4-door sedan
Trims covered
- Base
- Elegante
Known issues on the 1985 Seville. One recall is on federal record for this model year, covering the vehicle speed control system: a small nylon bushing in the cruise control servo bail may slip out of place, causing intermittent and unexpected increases in engine speed or dieseling (engine run on with ignition off), with the servo rod assembly also able to catch on engine components and result in a stuck throttle. Owners have filed 6 complaints for the year. The factory diagnostic and repair procedures behind that system are here.
Whether you're chasing an intermittent cruise control fault or working through a routine service interval, it keeps you on the OEM procedure and the correct specification for your specific 1985 Seville.
A SMALL NYLON BUSHING IN THE CRUISE CONTROL SERVO BAIL MAY SLIP OUT OF PLACE, CAUSING INTERMITTENT AND UNEXPECTED INCREASES IN ENGINE SPEED OR DIESELING (ENGINE RUN ON WITH IGNITION OFF).
SERVO ROD ASSEMBLY COULD CATCH ON ENGINE COMPONENTS ANDRESULT IN A STUCK THROTTLE WITH POTENTIAL FOR
INSTALL A NEW BUSHING IN CRUISE CONTROL SERVO BAIL.
I HAVE A 1985 CADILLAC STS WITH ONLY 70,000 MILES ON IT. IT IS HOUSED IN A GARAGE AT ALL TIMES AND IN VERY GOOD CONDITION. I HAVE IT AT MY MECHANIC'S AS I WRITE THIS. I WAS INFORMED THAT THE HORRIF
ENGINE BLOCK CORROSION. (1ST VEHICLE ON 602403)
SUDDEN ACCELERATION.
THE ENGINE ACCELERATES ALL BY ITSELF WHICH COULD CAUSE AN ACCIDENT IF ANOTHER AUTOS IN FRONT OF YOU. TT
POWER STEERING FAILED. *DH
Showing the 5 most serious of 6 complaints filed with NHTSA.
