1991 GMC Sonoma REPAIR MANUAL -- HOW TO FIX YOUR CAR OR TRUCK

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1991 GMC Sonoma CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT GMC REPAIR SHOPS DON'T WANT YOU TO KNOW

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Get Full Access Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 1991 GMC Sonoma 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 Sonoma automobile. Try the Automotix DIY solution today!
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Using the Automotix DIY repair procedures will save you hundreds and even thousands of dollars! In addition, it will save you hours of touring the city searching for GMC mechanics you can trust. The Automotix DIY solution is particularly affordable. A full access to the entire DIY repair procedures and diagrams for your 1991 GMC Sonoma vehicle will cost less than a single gallon of gas. Here are some of the DIY repair tips and procedures you will find here:

A/C & HEATER SERVICE PROCEDURES FOR 1991 GMC Sonoma AUTOMOBILES

A/C & Cooling System Maintenance -> General Motors Corp. -> 1990-2002 Chevrolet & GMC S & T Series & Oldsmobile Bravada
Vehicle: 1991 GMC Sonoma 2.8 V6 GAS

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BRAKE SERVICE PROCEDURES FOR 1991 GMC Sonoma AUTOMOBILES

DRUM BRAKES, GENERAL MOTORS -> Drum Brake Service -> Installation -> 1990-91 C & K SERIES w/NON-SERVO BRAKES -> EXCEPT TRACKER, 1990-91 C & K SERIES w/NON-SERVO BRAKES -> TRACKER
Vehicle: 1991 GMC Sonoma 2.5 L4 GAS

EXCEPT TRACKER, 1990-91 C & K SERIES w/NON-SERVO BRAKES

  • Lubricate parking brake lever fulcrum with suitable brake lube, then attach lever to brake shoe. Ensure lever operates smoothly.
  • Connect brake shoes with adjusting screw spring, then position adjusting screw. Ensure adjusting screw star wheel does not contact adjusting screw spring after installation, and also ensure RH thread adjusting screw is installed on left side of vehicle and LH thread adjusting screw is installed on right side of vehicle. When brake shoe installation is completed, ensure star wheel lines up with adjustin...

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FUEL FILTER REPLACEMENT PROCEDURES FOR 1991 GMC Sonoma 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 Sonoma 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 Sonoma AUTOMOBILES

DRIVESHAFT, Replace -> Front -> One Piece Driveshaft -> Rear -> Two Piece Driveshaft
Vehicle: 1991 GMC Sonoma 2.5 L4 GAS

Front

  • 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.
  • Reverse procedure to install, noting the following:
    • Torque front propeller shaft flange to front axl...

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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 1991 GMC Sonoma AUTOMOBILES

Starter, Replace
Vehicle: 1991 GMC Sonoma 4.3 V6 GAS

Upon removal of starter, note if any shims are used. If shims are used, they should be installed in their original locations. After installation, if starter is noisy during cranking, remove one .015 inch double shim or add one .015 inch single shim to outer bolt. If starter makes a high pitched whine after firing, add .015 inch double shims until noise ceases.

  • Disconnect battery ground cable.
  • Raise and support front of vehicle.
  • Raise vehicle half way to gain access to starter motor.
  • Re...

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MAINTENANCE LAMP RESET PROCEDURES FOR 1991 GMC Sonoma AUTOMOBILES

General Motors Corp./Saturn Trucks -> Service Four Wheel Drive (4WD) System Warning Lamp ->
Vehicle: 1991 GMC Sonoma 2.8 V6 GAS

This lamp should light for approximately 6-8 seconds when the ignition is turned On as a bulb check. If the ...

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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 1991 GMC Sonoma AUTOMOBILES

Heater Hose, Replace -> Inlet -> Outlet
Vehicle: 1991 GMC Sonoma 2.5 L4 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 Sonoma AUTOMOBILES

Serpentine Drive Belt, Replace
Vehicle: 1991 GMC Sonoma 4.3 V6 GAS

  • Remove belt tensioner pulley retaining bolt...

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COMPONENT LOCATION DIAGRAMS FOR 1991 GMC Sonoma AUTOMOBILES

Component location diagrams for most 1991 GMC Sonoma cars and light trucks sold in the U.S. from 1990+.

Rear Engine Components Diagram for 1991 GMC Sonoma  4.3 V6 GASRear Engine Components Diagram for 1991 GMC Sonoma 4.3 V6 GAS

Components on diagram:
  • Detonation Sensor
  • Oil Pressure Sensor/Switch
  • Ground G-107
  • Splice S-100
  • Splice S-106
  • LH Side Under Instrument Panel Diagram for 1991 GMC Sonoma  2.8 V6 GASLH Side Under Instrument Panel Diagram for 1991 GMC Sonoma 2.8 V6 GAS

    Components on diagram:
  • Horn Relay
  • Convenience Center
  • CLICK HERE TO GET FULL ACCESS TO 1991 GMC Sonoma PARTS/COMPONENTS LOCATION DIAGRAMS!

    WIRING DIAGRAMS FOR 1991 GMC Sonoma AUTOMOBILES

    OEM drawn wiring diagrams for most 1991 GMC Sonoma cars and light trucks sold in the U.S.

    1991 GMC Sonoma  4.3 V6 GAS Wiring Diagram1991 GMC Sonoma 4.3 V6 GAS Wiring Diagram

    Components on diagram:
  • Wiper Motor
  • Windshield Washer Pump
  • Conventional Wiper Washer Dimmer Switch
  • 1991 GMC Sonoma  2.5 L4 GAS Wiring Diagram1991 GMC Sonoma 2.5 L4 GAS Wiring Diagram

    Components on diagram:
  • Generator
  • Oil Pressure Sensor
  • Coolant Temperature Sensor
  • CLICK HERE TO GET FULL ACCESS TO 1991 GMC Sonoma WIRING DIAGRAMS!

    TECHNICAL SERVICE BULLETINS FOR 1991 GMC Sonoma AUTOMOBILES

    OEM TSB listings for most 1991 GMC Sonoma cars and light trucks sold in the U.S. from 1985+.

    Document: Car and Truck Fix It Right the First Time Issues
    Vehicle: 1991 GMC Sonoma 2.5 L4 GAS

    Auto Systems:
  • Labor Times, Manuals, Warranty, Aids
  • Document: GM TIRE WARRANTY PROGRAM CLAIMS GOODWILL GUIDELINES - REVISED
    Vehicle: 1991 GMC Sonoma 2.5 L4 GAS

    Auto Systems:
  • Labor Times, Manuals, Warranty, Aids
  • Wheels, Tires, Wheel Bearings, Seals, Hubs
  • CLICK HERE TO GET FULL ACCESS TO 1991 GMC Sonoma TECHNICAL SERVICE BULLETINS!

    COMPONENT/PARTS SPECIFICATIONS FOR 1991 GMC Sonoma AUTOMOBILES

    BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 1991 GMC Sonoma 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 Sonoma 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 Sonoma 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 Sonoma 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

    CLICK HERE TO GET FULL ACCESS TO 1991 GMC Sonoma SPECIFICATIONS DATA!

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