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1990 Audi Coupe Quattro CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT Audi 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!

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Get Full Access Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 1990 Audi Coupe Quattro car and truck repair procedures including Audi 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 Audi Coupe Quattro 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 Audi mechanics you can trust. The Automotix DIY solution is particularly affordable. A full access to the entire DIY repair procedures and diagrams for your 1990 Audi Coupe Quattro 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 1990 Audi Coupe Quattro AUTOMOBILES

A/C & Cooling System Maintenance -> Audi -> 1990-96
Vehicle: 1990 Audi Coupe Quattro 20V 2.3 L5 GAS

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BRAKE SERVICE PROCEDURES FOR 1990 Audi Coupe Quattro AUTOMOBILES

AUDI, HYDRAULIC BRAKE SYSTEM -> MASTER CYLINDER REPLACEMENT
Vehicle: 1990 Audi Coupe Quattro 20V 2.3 L5 GAS

Refer to Figs. through , when replacing master cylinder.

  • Disconnect brake lines from master cylinder.
  • R...

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FUEL FILTER REPLACEMENT PROCEDURES FOR 1990 Audi Coupe Quattro AUTOMOBILES

Audi -> Fuel Filter Replacement -> Gasoline Engines -> Removal & Installation
Vehicle: 1990 Audi Coupe Quattro 20V 2.3 L5 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.

Obtain the vehicle owner's radio theft protection code, then disconnect the battery ground cable. Briefly open fuel filler cap to relieve system pressure, then close it again.

After the battery has been disconnected and reconnected, some abnormal driveability symptoms may occur. The vehicle may need to be driven while it relearns its adaptive strategy.

Removal & Installation

On A4 and S4 mod...

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DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR 1990 Audi Coupe Quattro AUTOMOBILES

DRIVESHAFT, Replace
Vehicle: 1990 Audi Coupe Quattro 20V 2.3 L5 GAS

Propeller shaft work must be performed with vehicle on a suitable dual support hoist. Models equipped with an air bag system have a front propeller shaft section made of carbon fiber. This propeller shaft has variations in diameter which make installation and adjustment procedures different from that of previous propeller shafts.

  • Raise and support vehicle, then remove catalytic converter and exhaust pipe.
  • Tie exhaust system over to right side with wire, then loosen propeller shaft bolts at transmission, differential and center support.
  • On models less air bag system, install a s...

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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 1990 Audi Coupe Quattro AUTOMOBILES

Alternator, Replace
Vehicle: 1990 Audi Coupe Quattro 20V 2.3 L5 GAS

  • Disconnect battery ground cable at battery.
  • Relieve tension on drive belt and remove drive belt.
  • Remove electrical connections from alternator.
  • Re...

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MAINTENANCE LAMP RESET PROCEDURES FOR 1990 Audi Coupe Quattro AUTOMOBILES

Audi -> Auto-Check Indicator System ->
Vehicle: 1990 Audi Coupe Quattro 20V 2.3 L5 GAS

The auto-check system will monitor certain vehicle systems when the ignition switch is placed in the On position and vehicle is operated. When all monitored systems are functioning properly, the system display will indicate "OK" for a few seconds after the ignition switch is placed in the On position.

This system monitors brake fluid level and hydraulic pressure, engine oil pressure, coolant temperature and level, brake pad wear, headlamps and tail lamps, battery voltage, washer fluid level and fuel level.

When the auto-check yellow or r...

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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 1990 Audi Coupe Quattro AUTOMOBILES

Coolant Hose, Replace -> Lower -> Upper
Vehicle: 1990 Audi Coupe Quattro 20V 2.3 L5 GAS

Lower

  • Drain coolant into a suitable container.
  • Reposition hose clamp at radiator and remove hose.
  • Reposition hose clamp at thermostat and remove hose.
  • Remove hose from vehicle.
  • Reverse procedure to ...

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COMPONENT LOCATION DIAGRAMS FOR 1990 Audi Coupe Quattro AUTOMOBILES

Component location diagrams for most 1990 Audi Coupe Quattro cars and light trucks sold in the U.S. from 1990+.

Ground Locations Diagram for 1990 Audi Coupe Quattro 20V 2.3 L5 GASGround Locations Diagram for 1990 Audi Coupe Quattro 20V 2.3 L5 GAS

Components on diagram:
  • Ground 1
  • Ground 105
  • Ground 11
  • Ground 2
  • Ground 14
  • Coolant Temperature Switch Location Diagram for 1990 Audi Coupe Quattro 20V 2.3 L5 GASCoolant Temperature Switch Location Diagram for 1990 Audi Coupe Quattro 20V 2.3 L5 GAS

    Components on diagram:
  • Coolant Temperature Switch
  • CLICK HERE TO GET FULL ACCESS TO 1990 Audi Coupe Quattro PARTS/COMPONENTS LOCATION DIAGRAMS!

    WIRING DIAGRAMS FOR 1990 Audi Coupe Quattro AUTOMOBILES

    OEM drawn wiring diagrams for most 1990 Audi Coupe Quattro cars and light trucks sold in the U.S.

    1990 Audi Coupe Quattro 20V 2.3 L5 GAS Wiring Diagram1990 Audi Coupe Quattro 20V 2.3 L5 GAS Wiring Diagram

    Components on diagram:
  • Backup Lamp Switch
  • LH Backup Lamp
  • RH Backup Lamp
  • Speedometer Sender Unit
  • Coolant Low Level Switch
  • 1990 Audi Coupe Quattro 20V 2.3 L5 GAS Wiring Diagram1990 Audi Coupe Quattro 20V 2.3 L5 GAS Wiring Diagram

    Components on diagram:
  • Cruise Control Unit
  • Cruise Control Switch
  • Vacuum Vent Valve Brake
  • Vacuum Control Motor
  • Vacuum Vent Valve Clutch
  • CLICK HERE TO GET FULL ACCESS TO 1990 Audi Coupe Quattro WIRING DIAGRAMS!

    TECHNICAL SERVICE BULLETINS FOR 1990 Audi Coupe Quattro AUTOMOBILES

    OEM TSB listings for most 1990 Audi Coupe Quattro cars and light trucks sold in the U.S. from 1985+.

    Document: AIRBAG, REPLACEMENT INTERVAL CHANGE - REVISED
    Vehicle: 1990 Audi Coupe Quattro 20V 2.3 L5 GAS

    Auto Systems:
  • Seats, Belts, Interior Trim, Carpets, Air Bags
  • Document: AIRBAG / PYROTECHNIC SAFETY BELT DEPLOYMENT INQUIRIES - REVISED
    Vehicle: 1990 Audi Coupe Quattro 20V 2.3 L5 GAS

    Auto Systems:
  • Seats, Belts, Interior Trim, Carpets, Air Bags
  • CLICK HERE TO GET FULL ACCESS TO 1990 Audi Coupe Quattro TECHNICAL SERVICE BULLETINS!

    COMPONENT/PARTS SPECIFICATIONS FOR 1990 Audi Coupe Quattro AUTOMOBILES

    BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 1990 Audi Coupe Quattro 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 Audi Coupe Quattro 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 Audi Coupe Quattro 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 Audi Coupe Quattro 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 1990 Audi Coupe Quattro SPECIFICATIONS DATA!

    Shop online for auto body parts, engines, wheels, lights...

    Click here to view more details1990 Audi Coupe Quattro Mirror, Passenger Side.

    Source: Auto Body Parts Store

    $68.08

    Click here to view more details about 1991 Audi Coupe Quattro Antenna1991 Audi Coupe Quattro Antenna, 3-section mast; 1200 mm cable; A high quality universal pillar side mount antenna; May require modification or other adjustment to your vehicle upon installation; Backed by 1-year, unlimited-mileage warranty..

    Source: Auto Body Parts Store

    $6.14

    Click here to view more details about 1999 Audi A4 Driver Side Power Door Mirror1999 Audi A4 Driver Side Power Door Mirror, Driver Side Power Door Door Mirror; With Heated Glass; Foldaway; Long [10 X 4 1/2]; Paint To Match, , .

    Source: Wheels / Rims, Mirrors & Lights Store

    $86.50

    Click here to view more details1991 Audi Coupe Quattro 20V L5, 2.3 L, 2309 CC Rebuilt Engine, Warranty: 3-Year/100,000 Mile, .

    Source: Rebuilt Engines Store

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    Click here to view more details1990 Audi Coupe Quattro Used Heater Core, 1.8T QUATT, Very Good.

    Source: Used Auto Parts Store

    $129.00

    Click here to view more details1990 Audi Coupe Quattro Used Grille, upper, Very Good.

    Source: Used Auto Parts Store

    $80.00
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