Mechanical Inspection: Compression
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1993 Audi 90, 1993 Audi 100, 1992 Audi 100, 1991 Audi 90, and 1991 Audi 80. However, it is still accessible from the selected car via links, so may be relevant.
Check engine mechanical condition with a compression gauge, vacuum gauge, or an engine analyzer. See engine analyzer manual for specific instructions.
WARNING:
DO NOT
use ignition switch during compression tests on fuel injected vehicles. Use a remote starter to crank engine. Fuel injectors on many models are triggered by ignition switch during cranking mode, which can create a fire hazard or contaminate the engine's oiling system.