1990 Audi V8 Quattro Service and Repair Manual

This 1990 Audi V8 Quattro factory service and repair manual is built around the sedan's 3.6L V8 (engine code PT), so the torque values and adjustment procedures inside are the ones Audi specified for this exact powertrain, not a figure borrowed from a smaller-engine sibling.

Engines covered

• 3.6L V8 — DOHC, naturally aspirated, gasoline

Body styles covered

• 4-door sedan

Trims covered

• Base

Known issues on the 1990 V8 Quattro. Three recalls are on federal record for this model year. The first covers the vehicle speed control system: a bushing guiding the cruise control rod can deteriorate over time and bind, impeding the throttle plate's return to idle. The second covers the trunk-mounted jack: an incorrect instruction label for the jack supplied with the vehicle can lead to improper use and jack collapse, risking injury to anyone under or near the car. The third covers the frontal air bag sensor, which does not meet Audi's own durability standard and can malfunction in a way that lets the air bag deploy without warning, risking loss of vehicle control. Owners have filed 8 complaints for the year. The factory diagnostic and repair procedures behind each of those systems are here.

From a cruise control rod that won't return to idle to a proper check of the air bag sensor and jack setup, it keeps you on the OEM procedure and the correct specification for your specific 1990 V8 Quattro.