Audi 80 90 Coupe Quattro 1988-1991 Workshop Manual PDF

Description

File Details

• Manual type: Factory Workshop Manual
• Brand and models: Audi 80, Audi 90, Audi Coupe, including Quattro variants
• Model years covered: 1988 to 1991
• Language: English
• Page count: 2,234 pages
• File format: PDF

Covers Every Engine and Drivetrain in the Range

This manual documents the full 1988-1991 Audi 80/90/Coupe range: the 2.0-litre 4-cylinder CIS-Motronic engine (code 3A), the 2.3-litre 5-cylinder CIS-E engine (code NG), and the 2.3-litre 5-cylinder 20-valve MPI engine (code 7A) used in the Coupe Quattro. Front-wheel-drive and Quattro four-wheel-drive drivetrains are both covered, along with 5-speed manual, automatic (087/089/097) and 4-speed automatic transmissions, complete with the transmission and rear differential identification codes stamped on each unit, including the AEX and AEC Quattro rear final drive codes with their differing ratios for the Audi 80 Quattro versus the 90/Coupe Quattro.

Engine, Fuel Injection and Tune-Up Data

Engine chapters cover cylinder head and valve drive service, timing belt and camshaft oil seal replacement, and full tune-up specification tables for each engine code: firing order, ignition timing checking and adjusting values, spark plug type, electrode gap and tightening torque, idle RPM, CO content, and the exact control unit and distributor part numbers for both 49-state and California-specification vehicles. The 3A engine’s firing order is 1-3-4-2 with ignition timing adjusted to 6 +/-1 degree BTDC and idle held at 840 +/-60 rpm by the idle stabilization system; the 5-cylinder NG engine runs a 1-2-4-5-3 firing order with ignition adjusted to 15 +/-1 degree BTDC. Fuel system coverage spans the CIS-Motronic and CIS-E continuous injection systems as well as the MPI multi-point injection system on the 20V engine, with fuel pump, oxygen sensor and A/C auxiliary signal test procedures. Ignition timing, idle speed and CO adjustment procedures are given together, since the manual stresses these must be checked as a set using the differential pressure regulator’s own current adjustment.

Transmission, Differential and Driveline

Manual transmission chapters cover case, gears and shafts for both the 012 and 01A units, while automatic transmission chapters cover the 087, 089 and 097 torque converter units and the case, gears and shaft assembly, including circlip, clutch drum bushing and direct/reverse clutch end play adjustment (specified to 2.05-2.50 mm). Both the standard differential and the Torsen differential used in Quattro manual-transmission models are covered, along with the separate rear final drive unit fitted to Quattro cars, its own technical data table giving ratio, oil specification and fill quantity by model and engine.

Suspension, Brakes and Body

Rear wheel suspension and axle shaft service is illustrated for both standard and Quattro (separable wheel bearing/shock absorber housing) configurations, with torque figures for every fastener down to the tie rod and axle shaft bolts. Brake system coverage includes hydraulic pressure regulator testing on Quattro models, carried out under specified vehicle loading conditions. Body chapters cover front and rear body repair, paint and acid rain damage correction in a defined step-by-step sequence, sunroof assembly, glass and window regulators, seats with power adjustment actuators, and interior trim and automatic seat belt tensioning system service.

Electrical, Air Conditioning and Self-Diagnosis

Electrical chapters cover the windshield wiper and washer system, and the manual includes a full Diagnosis, Fault Memory section explaining the vehicle’s onboard self-diagnosis capability, fault code descriptions with symptoms and repair actions, and step-by-step diagnostic procedures for components such as the outside temperature sensors and A/C cooling fan control, including the separate California-specification permanent fault memory requirements. Lifting, jacking and towing instructions are also given in full, including the maximum towing speed and distance for each transmission type and a caution against towing the Coupe Quattro without unlocking the differential first.

Chapters Covered

• General (vehicle and engine identification, VIN location, technical data and tune-up specifications by engine, towing and lifting)
• Engine – Cylinder Head, Valve Drive
• Fuel Supply and Fuel Injection (CIS-Motronic, CIS-E, MPI/AFC)
• Ignition System
• Automatic Transmission (087, 089, 097) – Torque Converter, Case, Gears, Shaft
• Manual Transmission (012, 01A) – Case, Gears, Shafts
• Differential – Manual and Automatic Transmission, including Torsen and Quattro rear final drive
• Rear Wheel Suspension – Shafts and Axle
• Brake – Hydraulic Components, Regulator, Booster
• Body – Front, Rear, Sunroof, Glass and Window Regulators
• Body Accessories – Interior, Seats
• Air Conditioner
• Electrical System – Windshield Wiper and Washer
• Diagnosis, Fault Memory

Across these chapters the manual takes a technician from vehicle and engine identification through to engine, transmission, driveline, suspension, brake, body and electrical repair, plus the self-diagnosis routines Audi built into this generation of 80/90/Coupe, so a diagnostic session, a driveline rebuild or a body repair can all be carried out to the same factory standard.

Lifting, Towing and Jacking

The General chapter also gives correct hoist and floor jack lift points at both the front and rear underbody, with a caution against lifting by the engine, transmission or suspension. Towing instructions differ by drivetrain: front-wheel-drive cars can be towed at up to 50 mph for up to 50 miles with wheel-lift equipment, automatic transmission cars must have their front wheels lifted to protect the transmission, and the Coupe Quattro must have its differential unlocked before towing, with a 30 mph and 30 mile limit or a requirement to flat-bed the car for longer distances.

Get Instant Access

Whether the job is chasing a Motronic fault code, rebuilding a Torsen differential, matching Quattro suspension torque figures exactly, or working through an acid rain paint correction, this manual has the factory procedure rather than a forum guess. It downloads instantly after payment as a single PDF, works on any phone, tablet or computer, and can be printed page by page for the workshop, so there is no shipping wait for a manual this comprehensive.