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1991 GMC K1500 Pickup CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT GMC REPAIR SHOPS DON'T WANT YOU TO KNOW
Learn how to repair a car or truck, install or remove parts, wire an engine, reset warning lights, replace fuel filter, fix auto body and more. Get Automotix DIY!Select Section
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- 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 K1500 Pickup 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 K1500 Pickup automobile. Try the Automotix DIY solution today!
BRAKE SERVICE PROCEDURES FOR 1991 GMC K1500 Pickup AUTOMOBILES
ANTI-LOCK BRAKES, GENERAL MOTORS -> Rear Wheel Anti-Lock Brake System -> DIAGNOSIS & TESTING -> DIAGNOSTIC CHARTS -> DIAGNOSTIC CIRCUIT CHECK -> READING TROUBLE CODES -> WIRING DIAGRAMS
Vehicle: 1991 GMC K1500 Pickup Sierra 5.7 V8 GAS
WIRING DIAGRAMS
Refer to "Wiring Diagrams" in "Vehicle Systems."
READING TROUBLE CODES
Trouble codes are accessed by connecting a jumper wire between terminals A and H of the underdash ALDL connector and observing the flashes of the brake warning lamp. Note the following when performing the Diagnostic Circuit Check to access trouble codes.
- When the terminals are jumped, count the number of short flashes starting from the initial long flash and including the long flash in the count.
- The count sequence will repeat as long as the ALDL connector terminals are jumped with the ignition on.
- ...
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FUEL FILTER REPLACEMENT PROCEDURES FOR 1991 GMC K1500 Pickup AUTOMOBILES
General Motors Corp./Saturn Light Trucks, SUVs & Vans -> Fuel Filter Scheduled Maintenance -> 1988-95 C/K, G & R/V Series w/Gasoline Engine -> Heavy Duty Emissions -> Light Duty Emissions -> Normal Service -> Severe Service
Vehicle: 1991 GMC K1500 Pickup Sierra 4.3 V6 GAS
Light Duty Emissions
Normal Service
Replace every 60,000 miles
Severe Service
Rep...
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DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR 1991 GMC K1500 Pickup AUTOMOBILES
CV AXLE SHAFT, Replace
Vehicle: 1991 GMC K1500 Pickup Sierra XC 6.2 V8 DIESEL
- Raise and support vehicle.
- Remove wheel and tire assembly.
- Remove drive axle center cap, if equipped.
- Insert a drift or large screwdriver through brake caliper into one of the brake rotor vanes in order to prevent drive axle wheel drive shaft from turning.
- Remove nut and washer from hub. Do not reuse nut. A new nut must be used when installing wheel drive shaft.
- Using axle remover tool No. J 45859 or equivalent, press wheel drive shaft from hub.
- Remove bolts securing wheel dr...
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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 1991 GMC K1500 Pickup AUTOMOBILES
Starter, Replace
Vehicle: 1991 GMC K1500 Pickup Sierra 6.2 V8 DIESEL
- Disconnect battery ground cable.
- Remove starter braces or heat shields, if equipped.
- Disconnect starter solenoid electrical connectors.
- Raise and support vehicle.
- Remove at...
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MAINTENANCE LAMP RESET PROCEDURES FOR 1991 GMC K1500 Pickup AUTOMOBILES
General Motors Corp./Saturn Trucks -> Diesel Engine Water In Fuel Or Drain Fuel Filter Warning Lamp ->
Vehicle: 1991 GMC K1500 Pickup Sierra 6.2 V8 DIESEL
The "Water in Fuel" indicator will light when excessive water has entered the fuel system. A low pressure sensor activates the lamp as the fuel filter becomes plugged. The lamp will light during engine starting as a bulb check.
Once engine has started, the lamp should go Off. If the lamp is lit intermittently or remains lit, drain fuel filter. If the lamp still remains On after fuel filter has been drained, replace fuel filter. If lamp is lit during high speed opera...
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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 1991 GMC K1500 Pickup AUTOMOBILES
Coolant Hose, Replace -> Lower -> Upper
Vehicle: 1991 GMC K1500 Pickup Sierra XC 4.3 V6 GAS
Lower
- Drain cooling system into a suitable container.
- Reposition hose clamp at radiator outlet and remove hose.
- Reposition hose clamp at water pump inlet and remove hose.
- Remove hose from vehicle.
- Reverse procedure...
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SERPENTINE BELT SERVICE PROCEDURES FOR 1991 GMC K1500 Pickup AUTOMOBILES
Serpentine Drive Belt, Replace
Vehicle: 1991 GMC K1500 Pickup Sierra 5.0 V8 GAS
- Rotate tensioner counterclockwise, using a 1/2 inch breaker bar with a socket placed on tensioner ...
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COMPONENT LOCATION DIAGRAMS FOR 1991 GMC K1500 Pickup AUTOMOBILES
Component location diagrams for most 1991 GMC K1500 Pickup cars and light trucks sold in the U.S. from 1990+.
 Transmission Components Diagram for 1991 GMC K1500 Pickup Sierra XC 5.0 V8 GASComponents on diagram: |
 Auxiliary Battery Diagram for 1991 GMC K1500 Pickup Sierra 5.7 V8 GASComponents on diagram: |
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WIRING DIAGRAMS FOR 1991 GMC K1500 Pickup AUTOMOBILES
OEM drawn wiring diagrams for most 1991 GMC K1500 Pickup cars and light trucks sold in the U.S.
 1991 GMC K1500 Pickup Sierra 4.3 V6 GAS Wiring DiagramComponents on diagram: |
 1991 GMC K1500 Pickup Sierra XC 5.7 V8 GAS Wiring DiagramComponents on diagram: |
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TECHNICAL SERVICE BULLETINS FOR 1991 GMC K1500 Pickup AUTOMOBILES
OEM TSB listings for most 1991 GMC K1500 Pickup 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 K1500 Pickup Sierra 4.3 V6 GAS Auto Systems: |
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Document: GM TIRE WARRANTY PROGRAM CLAIMS GOODWILL GUIDELINES - REVISED Vehicle: 1991 GMC K1500 Pickup Sierra 4.3 V6 GAS Auto Systems: |
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COMPONENT/PARTS SPECIFICATIONS FOR 1991 GMC K1500 Pickup AUTOMOBILES
BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 1991 GMC K1500 Pickup 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 K1500 Pickup 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 K1500 Pickup 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 K1500 Pickup 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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