Mechanical Inspection: Compression

Check engine mechanical condition with a compression gauge, vacuum gauge, or an engine analyzer. See engine analyzer manual for specific instructions. For complete compression specifications, refer to SPECIFICATIONS - 4-CYL article (for 4 cylinder models), or refer to SPECIFICATIONS - V6 article (for 6 cyl models) and to SPECIFICATIONS - V8 article (for 8 cylinder models).

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.