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1991 Ford Explorer CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT Ford REPAIR SHOPS DON'T WANT YOU TO KNOW
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- Component Locations
- Wiring Diagrams
- Technical Service Bulletins
- Specifications
- 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

A/C & HEATER SERVICE PROCEDURES FOR 1991 Ford Explorer AUTOMOBILES
A/C & Cooling System Maintenance -> Ford Motor Co. -> 1990-93 Ford Aerostar, Bronco II & Explorer & 1990-94 Ranger
Vehicle: 1991 Ford Explorer 4.0 V6 GAS
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BRAKE SERVICE PROCEDURES FOR 1991 Ford Explorer AUTOMOBILES
POWER BRAKE UNITS, FORD -> Bendix Hydro-Boost Brake Booster -> BRAKE BOOSTER SERVICE -> INSTALLATION -> REMOVAL
Vehicle: 1991 Ford Explorer 4.0 V6 GAS
The hydra-boost power brake booster is serviced as a unit.
REMOVAL
- With engine off, depress brake pedal several times to discharge the accumulator.
- Remove master cylinder from brake booster and position up and out of the way. Do not apply booster with master cylinder removed.
- Disconnect three hydraulic lines from booster, then disconnect input pushrod from brake pedal assembly, Fig. .
- Remove booster mounting nuts, then remove booster from vehicle. Do not carry booster by the accumulator and be careful not to drop booster on the accumulator. The snap ring on the accumulator shou...
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FUEL FILTER REPLACEMENT PROCEDURES FOR 1991 Ford Explorer AUTOMOBILES
Ford Motor Co. Light Trucks, SUVs & Vans -> Fuel Filter Scheduled Maintenance -> 1983-93 Bronco II, Escape, Explorer, Explorer Sport & Sport Trac, Mariner & Mountaineer -> Normal Service -> Severe Service
Vehicle: 1991 Ford Explorer 4.0 V6 GAS
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DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR 1991 Ford Explorer AUTOMOBILES
DRIVESHAFT, Replace -> Four Wheel Drive (4WD) -> Front -> Rear -> Two Wheel Drive (2WD)
Vehicle: 1991 Ford Explorer 4.0 V6 GAS
Front
The electrical power to the air suspension system must be shut off prior to hoisting, jacking or towing an air suspension vehicle. This can be accomplished by turning off the air suspension switch located in the rear jack storage area. Failure to do so can result in unexpected inflation or deflation of the air springs, which can result in shifting of the vehicle during these operations.
- With vehicle in neutral, raise and support vehicle.
- Index-mark front axle pinion flange to front driveshaft.
- Remove transfer case skid plate.
- Index-mark transfer case pinion flange to front ...
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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 1991 Ford Explorer AUTOMOBILES
Starter, Replace
Vehicle: 1991 Ford Explorer 4.0 V6 GAS
- Disconnect battery ground cable.
- Raise and support vehicle, if required.
- Disconnect electrical connector or solenoid relay wire from starter motor.
- Remove starter motor attachi...
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MAINTENANCE LAMP RESET PROCEDURES FOR 1991 Ford Explorer AUTOMOBILES
Ford Motor Co. Trucks -> Check Gauge Warning Lamp ->
Vehicle: 1991 Ford Explorer 4.0 V6 GAS
This indicator should light if any of the following conditions appear:
- Engine oil pressure drops below approxi...
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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 1991 Ford Explorer AUTOMOBILES
Coolant Hose, Replace -> Lower -> Upper
Vehicle: 1991 Ford Explorer 4.0 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 and remove hose.
- Remove hose from vehicle.
- Reverse procedure to install.
Upper
- Drain cooling system into a s...
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SERPENTINE BELT SERVICE PROCEDURES FOR 1991 Ford Explorer AUTOMOBILES
Serpentine Drive Belt, Replace
Vehicle: 1991 Ford Explorer 4.0 V6 GAS
- Raise tensioner by turning counterclockwise, then remove belt.
- Install new be...
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COMPONENT LOCATION DIAGRAMS FOR 1991 Ford Explorer AUTOMOBILES
Component location diagrams for most 1991 Ford Explorer cars and light trucks sold in the U.S. from 1990+.
![]() Components on diagram: |
![]() Components on diagram: |
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WIRING DIAGRAMS FOR 1991 Ford Explorer AUTOMOBILES
OEM drawn wiring diagrams for most 1991 Ford Explorer cars and light trucks sold in the U.S.
![]() Components on diagram: |
![]() Components on diagram: |
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TECHNICAL SERVICE BULLETINS FOR 1991 Ford Explorer AUTOMOBILES
OEM TSB listings for most 1991 Ford Explorer cars and light trucks sold in the U.S. from 1985+.
Document: MERCON ATF IS BEING REPLACED BY MERCON V AS A SERVICE FLUID FOR SOME MANUAL TRANSMISSIONS Vehicle: 1991 Ford Explorer 4.0 V6 GAS Auto Systems: |
Document: MERCON ATF IS BRING REPLACED BY MERCON V ATF AS A SERVICE FLUID Vehicle: 1991 Ford Explorer 4.0 V6 GAS Auto Systems: |
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COMPONENT/PARTS SPECIFICATIONS FOR 1991 Ford Explorer AUTOMOBILES
BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 1991 Ford Explorer 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 Ford Explorer 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 Ford Explorer 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 Ford Explorer 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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