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1991 GMC Syclone CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT GMC REPAIR SHOPS DON'T WANT YOU TO KNOW
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- Component Locations
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- A/C & Heater Service
- Brake Service
- Fuel Filter Replacement
- Driveline, U-Joint & CV Axles Replacement
- Starter & Alternator Replacement
- Maintenance Lamp Reset
- Radiator & Hose Replacement
- Serpentine Belt Service
Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 1991 GMC Syclone car and truck
repair procedures including GMC engine diagrams, wiring diagrams, repair work estimating measures, technical service bulletins, auto body work
guidance, starter & alternator replacement procedures, serpentine belt replacement procedures, radiator & hose replacement procedures, tune-up &
drivability specifications, quick lube illustrations, preventive maintenance guide, engine light reset instructions, parts removal and install
procedures, fuel filter replacement directions, component location diagrams, air filter locations & replacement instructions, a/c
system specifications, and general auto service procedures. You don't have to be a car mechanic or technician to know how to fix
your GMC Syclone automobile. Try the Automotix DIY solution today!
A/C & HEATER SERVICE PROCEDURES FOR 1991 GMC Syclone AUTOMOBILES
A/C & Cooling System Maintenance -> General Motors Corp. -> 1990-2002 Chevrolet & GMC S & T Series & Oldsmobile Bravada
Vehicle: 1991 GMC Syclone 4.3 V6 GAS
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BRAKE SERVICE PROCEDURES FOR 1991 GMC Syclone AUTOMOBILES
DRUM BRAKES, GENERAL MOTORS -> Drum Brake Service -> Removal -> 1990-91 C & K SERIES w/NON-SERVO BRAKES -> EXCEPT TRACKER & 1990-91 C & K SERIES w/NON-SERVO BRAKES -> TRACKER
Vehicle: 1991 GMC Syclone 4.3 V6 GAS
EXCEPT TRACKER & 1990-91 C & K SERIES w/NON-SERVO BRAKES
- Raise and support vehicle, then remove tire and wheel assembly.
- Remove brake drum. If brake lining is dragging on brake drum, back off brake adjustment by rotating adjustment screw. Refer to individual truck chapter for procedure. If brake drum is rusted or corroded to axle flange and cannot be removed, lightly tap flange to drum mounting surface with a suitable hammer.
- Using brake spring pliers or equivalent, unhook primary and secondary return springs, Figs. through . Observe location of brake parts being removed to aid during ins...
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FUEL FILTER REPLACEMENT PROCEDURES FOR 1991 GMC Syclone AUTOMOBILES
General Motors Corp./Saturn Light Trucks, SUVs & Vans -> Fuel Pressure Relief -> Except Montana SV6, Relay, Rendezvous w/3.6L Engine, Terraza, Tracker & Uplander -> Engine Fuel Pressure Service Port -> Engines Less Fuel Pressure Service Port
Vehicle: 1991 GMC Syclone 4.3 V6 GAS
Do not smoke or allow an open flame of any type when working on or near any fuel system related components. The highly flammable vapor mixtures may ignite, resulting in serious personal injury.
Prior to disconnecting fuel lines, the fuel system pressure must be relieved to prevent accidental spray of fuel.
After the battery has been disconnected and reconnected, some abnormal driveability symptoms may occur. The vehicle may need to be driven while the vehicle relearns its adaptive strategy.
Engines Less Fuel Pressure ...
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DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR 1991 GMC Syclone AUTOMOBILES
DRIVESHAFT, Replace -> Front -> Install -> One Piece Driveshaft -> Rear -> Remove -> Two Piece Driveshaft
Vehicle: 1991 GMC Syclone 4.3 V6 GAS
Front
Remove
- Raise and support vehicle.
- Mark the front U-joint to the pinion yoke on the front differential.
- Mark the relationship of the rear U-joint to the transfer case drive flange.
- Remove the retaining nuts and bolts from the drive flange.
- Remove the clamps and retaining bolts from the front drive axle pinion flange.
- Remove the front propeller shaft from the vehicle.
- Using tape and or a rubber band, wrap the front U-joint bearing caps to ensure the caps do not separate from the U-joint.
Install
- Remove the tape or rubber band from the front U-joint
- Install the front propeller shaf...
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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 1991 GMC Syclone AUTOMOBILES
Alternator, Replace
Vehicle: 1991 GMC Syclone 4.3 V6 GAS
- Disconnect battery ground cable.
- Remove alternator.
- Remove alternator mounting bolts.
- Remove output terminal nut.
- Disconnect electrical connector.
- Remove alternator from vehicle.
- Reverse procedure to install, noting the fol...
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MAINTENANCE LAMP RESET PROCEDURES FOR 1991 GMC Syclone AUTOMOBILES
General Motors Corp./Saturn Trucks -> Service Throttle Soon Indicator Lamp ->
Vehicle: 1991 GMC Syclone 4.3 V6 GAS
A "Service Throttle Soon" indicator lamp is mounted in the lower righthand instrument cluster corner on these models. It lights when the ignition is turned On, but should go out approximately 1-5 seconds after the engine starts.
Traditional throttle cables are no longer used on these models. The PCM receives signals from an electron...
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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 1991 GMC Syclone AUTOMOBILES
Heater Hose, Replace -> Inlet -> Outlet
Vehicle: 1991 GMC Syclone 4.3 V6 GAS
Inlet
- Drain cooling system into a suitable container.
- Reposition hose clamp at heater core.
- Remove inlet heater hose from heater core.
- Reposition hose clamp at cylinder head.
- Remove inlet heater hose from cylinder head.
- Remove hose from vehicle.
- Reverse procedu...
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SERPENTINE BELT SERVICE PROCEDURES FOR 1991 GMC Syclone AUTOMOBILES
Serpentine Drive Belt, Replace
Vehicle: 1991 GMC Syclone 4.3 V6 GAS
- Remove belt tensioner pulley retaining bolt...
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COMPONENT LOCATION DIAGRAMS FOR 1991 GMC Syclone AUTOMOBILES
Component location diagrams for most 1991 GMC Syclone cars and light trucks sold in the U.S. from 1990+.
 Heater & A/C Components, Instrument Panel Diagram for 1991 GMC Syclone 4.3 V6 GASComponents on diagram: |
 LH Front Side Of Engine Diagram for 1991 GMC Syclone 4.3 V6 GASComponents on diagram: |
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WIRING DIAGRAMS FOR 1991 GMC Syclone AUTOMOBILES
OEM drawn wiring diagrams for most 1991 GMC Syclone cars and light trucks sold in the U.S.
 1991 GMC Syclone 4.3 V6 GAS Wiring DiagramComponents on diagram: |
 1991 GMC Syclone 4.3 V6 GAS Wiring DiagramComponents on diagram: |
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TECHNICAL SERVICE BULLETINS FOR 1991 GMC Syclone AUTOMOBILES
OEM TSB listings for most 1991 GMC Syclone cars and light trucks sold in the U.S. from 1985+.
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Document: Car and Truck Fix It Right the First Time Issues Vehicle: 1991 GMC Syclone 4.3 V6 GAS Auto Systems: |
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Document: GM TIRE WARRANTY PROGRAM CLAIMS GOODWILL GUIDELINES - REVISED Vehicle: 1991 GMC Syclone 4.3 V6 GAS Auto Systems: |
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COMPONENT/PARTS SPECIFICATIONS FOR 1991 GMC Syclone AUTOMOBILES
BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 1991 GMC Syclone cars and light trucks sold in the U.S. and Canada from 1970+.
- Brake caliper mounting bolt torque
- Brake drum runout, machining, & discard specs
- Minimum brake lining thickness.
- Brake rotor runout, parallelism, machining, discard, & finish specs
A/C SYSTEM SPECIFICATIONS: Air conditioning refrigerant capacity and type as well as lubricant capacity for most 1991 GMC Syclone cars and light trucks sold in the U.S. and Canada from 1980+.
- Refrigerant capacity & type, compressor oil viscosity, total system oil capacity & compressor clutch gap
COOLING SYSTEM BLEED: Cooling system bleeder valve identification, bleeder type and bleed procedures for most domestic and imported cars and light trucks sold in the U.S. and Canada from 1986+.
PREVENTIVE MAINTENANCE: Preventive maintenance recommendations and required services for most domestic and imported cars and light trucks sold in the U.S. and Canada from 1980+. Includes severe and routine service schedules
QUICK-LUBE and ILLUSTRATIONS: Fluid recommendations, capacities, drain plug torques, tire data, and severe service recommended preventive maintenance schedules. Information covers most 1991 GMC Syclone cars and light trucks sold in the U.S. and Canada from 1980+. Engine and chassis service images.
- Automatic transmission/transaxles capacities, lubricant recommendations
- Differential/final drive capacities, lube recommendations, grades, & viscosities
- Final drive fill & drain plug torques
- Number of lubrication fittings & plugs
- Power steering, brake, & clutch fluid recommendations
- Manual transmission/transaxle capacities, lube recommendations, grades, & viscosities
- Number of lubrication fittings & plugs
- Power steering, brake, & clutch fluid recommendations
- Engine oil capacities, API grade recommendations, SAE viscosity recommendations, drain plug torque
- Severe service maintenance & interval recommendations
- Tire sizes, wheel nut/bolt torque, pressures & rim sizes
- Transfer case capacities, lube recommendations, grades, & viscosities
TUNE-UP & DRIVEABILITY SPECIFICATIONS: Most tune-up specifications for most 1991 GMC Syclone cars and light trucks sold in the U.S. and Canada from 1980+
- Airflow sensor electrical specifications
- Tensioning specifications for systems with automatic tensioners
- Barometric pressure sensor specs
- Battery group number and cranking performance
- Crankshaft & camshaft position sensor resistance
- Engine compression pressures
- Coolant temperature sensor specs
- Computer advance.
- Diesel fuel temperature sensor resistance.
- Distributor advance specifications
- Ignition pickup coil resistance
- Exhaust gas recirculation temperature sensor resistance
- Engine fastener torque values
- Firing order diagrams
- Fuel system pressures
- Generator (alternator) specs
- Intake air temperature sensor specs
- Ignition coil specifications
- Fuel injector resistance
- Engine idle speeds
- Knock sensor resistance
- Manifold absolute pressure sensor specs
- Mixture control solenoid resistance
- Voltage regulator specs
- Spark plug applications & gaps
- Starter motor electrical specs.
- Tensioning specifications for systems without automatic tensioners
- Throttle body temperature sensor resistance
- Ignition timing in degrees at rpm
- Transmission oil temperature sensor resistance
- Throttle position sensor specs
- Vacuum sensor valve specs
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