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1990 Jeep Wrangler CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT Jeep REPAIR SHOPS DON'T WANT YOU TO KNOW
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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 1990 Jeep Wrangler car and truck
repair procedures including Jeep 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 Jeep Wrangler automobile. Try the Automotix DIY solution today!
A/C & HEATER SERVICE PROCEDURES FOR 1990 Jeep Wrangler AUTOMOBILES
A/C & Cooling System Maintenance -> DaimlerChrysler Corp. -> Jeep
Vehicle: 1990 Jeep Wrangler 4.2 L6 GAS
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BRAKE SERVICE PROCEDURES FOR 1990 Jeep Wrangler AUTOMOBILES
DRUM BRAKES, CHRYSLER CORP. -> Drum Brakes, Jeep -> BRAKE SHOE, Replace -> 1990-91 Grand Wagoneer -> CJ-7, Cherokee, Comanche, Scrambler, Wagoneer & Wrangler -> INSTALLATION -> REMOVAL
Vehicle: 1990 Jeep Wrangler 2.5 L4 GAS
REMOVAL
CJ-7, Cherokee, Comanche, Scrambler, Wagoneer & Wrangler
- Raise and support vehicle.
- Remove wheel and tire assemblies, then the brake drums.
- Remove U-clip and washer (1) from parking brake lever pivot pin, Fig. , and discard clip.
- Using suitable tool, remove primary and secondary return springs (2).
- Remove spring retainers, hold-down springs, and retaining pins (8).
- Install suitable clamps over ends of wheel cylinders.
- Remove adjuster lever, adjuster screw, and spring (4) from brake shoes (5).
- Remove brake shoes.
1990-91 Grand Wagoneer
- Raise and support vehicle, then remove brak...
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FUEL FILTER REPLACEMENT PROCEDURES FOR 1990 Jeep Wrangler AUTOMOBILES
DaimlerChrysler Corp./Jeep Light Trucks, SUVs & Vans -> Fuel Filter Scheduled Maintenance -> 1985-92 Jeep w/Gasoline Engine -> Normal Service -> Severe Service
Vehicle: 1990 Jeep Wrangler Islander 2.5 L4 GAS
Normal Service
Replace eve...
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DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR 1990 Jeep Wrangler AUTOMOBILES
DRIVESHAFT U-JOINT, Replace
Vehicle: 1990 Jeep Wrangler 2.5 L4 GAS
Clamp only the narrow forged portion of the yoke in the vise. Failure to heed caution may result in damage.
- Remove axle shaft.
- Remove bearing cap retaining snap rings. Saturate the bearing caps with penetrating oil prior to removal.
- Place socket (receiver) with inside diameter larger than bearing cap against yoke and perimeter of bearing cap to be removed.
- Pla...
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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 1990 Jeep Wrangler AUTOMOBILES
Starter, Replace
Vehicle: 1990 Jeep Wrangler Laredo 4.2 L6 GAS
- Disconnect battery ground cable.
- Remove starter to flywheel housing and rear bracket to engine or transaxle attaching bolts.
- Remove heat shield clamp and heat shield, if required.
- Disconnect starter cable a...
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MAINTENANCE LAMP RESET PROCEDURES FOR 1990 Jeep Wrangler AUTOMOBILES
Chrysler LLC Trucks -> All Wheel Drive (AWD) Warning Lamp ->
Vehicle: 1990 Jeep Wrangler Islander 4.2 L6 GAS
This light monitors the AWD system. The light will turn on for a bulb check when the ignition switch is turned to the on position and may stay on for as long as three seconds. When the lamp is illuminated solid here is an A...
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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 1990 Jeep Wrangler AUTOMOBILES
Coolant Hose, Replace -> Lower -> Upper
Vehicle: 1990 Jeep Wrangler 2.5 L4 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 1990 Jeep Wrangler AUTOMOBILES
Serpentine Drive Belt, Replace
Vehicle: 1990 Jeep Wrangler 2.5 L4 GAS
Belt tension is adjusted at the power steering pump or idler pulley if not equipped with power steering.
- Disconnect battery ground cable.
- Loosen power steeri...
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COMPONENT LOCATION DIAGRAMS FOR 1990 Jeep Wrangler AUTOMOBILES
Component location diagrams for most 1990 Jeep Wrangler cars and light trucks sold in the U.S. from 1990+.
 Transmission Components Diagram for 1990 Jeep Wrangler Laredo 4.2 L6 GASComponents on diagram: |
 Engine Components Diagram for 1990 Jeep Wrangler Islander 4.2 L6 GASComponents on diagram: |
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WIRING DIAGRAMS FOR 1990 Jeep Wrangler AUTOMOBILES
OEM drawn wiring diagrams for most 1990 Jeep Wrangler cars and light trucks sold in the U.S.
 1990 Jeep Wrangler Laredo 4.2 L6 GAS Wiring DiagramComponents on diagram: |
 1990 Jeep Wrangler Islander 4.2 L6 GAS Wiring DiagramComponents on diagram: |
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TECHNICAL SERVICE BULLETINS FOR 1990 Jeep Wrangler AUTOMOBILES
OEM TSB listings for most 1990 Jeep Wrangler cars and light trucks sold in the U.S. from 1985+.
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Document: AUTOMATIC TRANSMISSION FLUID USAGE - ATF+4 (TYPE 9602) - REVISED Vehicle: 1990 Jeep Wrangler 2.5 L4 GAS Auto Systems: |
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Document: WINDSHIELD WIPER BLADE / ELEMENT MAINTENANCE Vehicle: 1990 Jeep Wrangler 2.5 L4 GAS Auto Systems: |
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COMPONENT/PARTS SPECIFICATIONS FOR 1990 Jeep Wrangler AUTOMOBILES
BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 1990 Jeep Wrangler 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 1990 Jeep Wrangler 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 1990 Jeep Wrangler 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 1990 Jeep Wrangler 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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