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1990 Porsche 928 CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT Porsche 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
A/C & HEATER SERVICE PROCEDURES FOR 1990 Porsche 928 AUTOMOBILES
A/C & Cooling System Maintenance -> Porsche -> 928, 944, 968 & 1990-94 911
Vehicle: 1990 Porsche 928 S4 5.0 V8 GAS
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BRAKE SERVICE PROCEDURES FOR 1990 Porsche 928 AUTOMOBILES
PORSCHE, POWER BRAKE UNITS -> POWER BRAKE UNITS -> BRAKE BOOSTER REPLACEMENT -> 911 -> 928 -> 944
Vehicle: 1990 Porsche 928 S4 5.0 V8 GAS
911
- Remove brake booster operating rod lockpin.
- Remove master cylinder attaching bolt from luggage compartment floor plate.
- Drain brake fluid reservoir.
- Disconnect electrical connectors for stop light switch, then disconnect vacuum hose at brake booster and the brake lines at master cylinder.
- Remove brake booster brace upper attaching bolt and the booster base attaching nuts, then remove master cylinder and booster as an assembly. Brace and operating rod do not have to be disconnected at pedal assembly to remove brake booster.
- Reverse procedure to install, noting the followi...
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FUEL FILTER REPLACEMENT PROCEDURES FOR 1990 Porsche 928 AUTOMOBILES
Porsche -> Component Locations -> 1981-95 Porsche 928
Vehicle: 1990 Porsche 928 GT 5.0 V8 GAS
Refer to F...
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DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR 1990 Porsche 928 AUTOMOBILES
CV AXLE SHAFT, Replace -> Axle Shaft Bolted On Both Sides -> Axle Shaft Welded On One Side -> Rear
Vehicle: 1990 Porsche 928 S4 5.0 V8 GAS
Rear
Axle Shaft Bolted On Both Sides
- Raise and support vehicle, then remove left rear wheel and tire assembly.
- Remove socket head bolts from drive flanges.
- Remove righthand axle shaft inward.
- Remove lefthand axle shaft outward.
- Reverse procedure to install, noting the following:
- Torque wheel lug nuts to 80 ft. lbs.
- Torque socket head bolts to 60 ft. lbs.
Axle Shaf...
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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 1990 Porsche 928 AUTOMOBILES
Starter, Replace
Vehicle: 1990 Porsche 928 GT 5.0 V8 GAS
- Disconnect battery ground cable at battery.
- Disconnect battery and alternator wiring, if equipped...
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MAINTENANCE LAMP RESET PROCEDURES FOR 1990 Porsche 928 AUTOMOBILES
Porsche -> Anti-Lock Brake System (ABS)/Traction Control System (TCS) Indicator ->
Vehicle: 1990 Porsche 928 S4 5.0 V8 GAS
The Anti-Lock Brake/Traction Control System lamp will be illuminated when the ignition switch is in the on position with engine not running. When the engine is started, the lamp should go out. ...
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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 1990 Porsche 928 AUTOMOBILES
Radiator, Replace
Vehicle: 1990 Porsche 928 GT 5.0 V8 GAS
- Drain coolant into a suitable container.
- Reposition clamp on upper hose and remove hose.
- Reposition clamp on expansion tank hose and remove hose.
- Reposition clamp on lower hose and remove ho...
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COMPONENT LOCATION DIAGRAMS FOR 1990 Porsche 928 AUTOMOBILES
Component location diagrams for most 1990 Porsche 928 cars and light trucks sold in the U.S. from 1990+.
Ignition Circuit Monitoring Relay Location Diagram for 1990 Porsche 928 S4 5.0 V8 GAS Components on diagram: |
Diagnosis Plug Location Diagram for 1990 Porsche 928 S4 5.0 V8 GAS Components on diagram: |
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WIRING DIAGRAMS FOR 1990 Porsche 928 AUTOMOBILES
OEM drawn wiring diagrams for most 1990 Porsche 928 cars and light trucks sold in the U.S.
1990 Porsche 928 GT 5.0 V8 GAS Wiring Diagram Components on diagram: |
1990 Porsche 928 S4 5.0 V8 GAS Wiring Diagram Components on diagram: |
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TECHNICAL SERVICE BULLETINS FOR 1990 Porsche 928 AUTOMOBILES
OEM TSB listings for most 1990 Porsche 928 cars and light trucks sold in the U.S. from 1985+.
Document: WARRANTY ADMINISTRATION - CSO SURCHARGES NOT ALLOWED ON WARRANTY CLAIMS Vehicle: 1990 Porsche 928 S4 5.0 V8 GAS Auto Systems: |
Document: OVERVIEW OF APPROVED ENGINE OILS - REVISED Vehicle: 1990 Porsche 928 S4 5.0 V8 GAS Auto Systems: |
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COMPONENT/PARTS SPECIFICATIONS FOR 1990 Porsche 928 AUTOMOBILES
BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 1990 Porsche 928 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 Porsche 928 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 Porsche 928 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 Porsche 928 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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