This factory service and repair manual for the 1991 GMC Syclone covers a two-door standard cab pickup with one engine and one trim: a turbocharged 4.3L V6 of 262 cubic inches, overhead-valve, in Base specification. A turbocharged engine changes what a shop needs on hand, from the fueling and ignition figures to the torque values for the parts living with the extra heat and pressure, and this manual keeps those specifications, wiring diagrams and diagnostic procedures together with the rest of the truck's systems.
Engines covered
- 4.3L V6 (262 cu in) — OHV, turbocharged, gasoline
Body styles covered
- 2-door standard cab pickup
Trims covered
- Base
Known issues on the 1991 Syclone. Seven owner complaints are logged with NHTSA against this model year, five of them on the service brakes and one each on the power train and engine cooling. For a light truck carrying a turbocharged V6, those are the systems worth having documented properly, and this manual sets out the hydraulic brake procedures and specifications, the driveline work, and the cooling system service and diagnostics alongside the engine's own torque values and wiring diagrams.
WHILE DRIVING IN STOP AND GO TRAFFIC TRAVELING 3-5MPH, VEHICLE IN FRONT STOPPED SUDDENLY. CONSUMER WENT TO APPLY BRAKES, AND BRAKES FAILED AND PEDAL WENT TO THE FLOOR. DENTED THE BUMPER, AND CRACKED
FAILED TO STOP AND CRASHED INTO REAR OF VEHICLE IN FRONT OF ME
FRONT SHAFT FROM TRANSFER CASE TO DIFFERENTIAL FAILED, REPLACED UNDER FACTORY WARRANTY, ABS BRAKE MASTER UNIT FAILED AT 52,550 MILES OUTSIDE THE EXTENDED WARRANTY BY 6 MONTHS DEALER REFUSED TO REPAIR
FRONT SHAFT FROM TRANSFER CASE TO DIFFERENTIAL FAILED, REPLACED UNDER FACTORY WARRANTY, ABS BRAKE MASTER UNIT FAILED AT 52,550 MILES OUTSIDE THE EXTENDED WARRANTY BY 6 MONTHS DEALER REFUSED TO REPAIR
THE CONSUMER HAS BEEN EXPERIENCING PROBLEMS WITH ANTI-LOCK BRAKE SYSTEM. WHEN APPLYING THEIR BRAKES, DRIVER'S FOOT GOES ALL THE WAY TO THE FLOORBOARD. THE MANUFACTURER HAS YET TO BE CONTACTED. INVE
Showing the 5 most serious of 8 complaints filed with NHTSA.
