Mechanical Inspection: Compression
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 1997 Pontiac Grand Prix, 1997 Pontiac Firebird, 1997 Pontiac Bonneville, 1997 Oldsmobile Regency, and 1997 Oldsmobile LSS. 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. For compression specifications, see the SPECIFICATIONS article.
WARNING:
Because fuel injectors on many models are triggered by ignition switch during cranking mode, DO NOT use ignition switch during compression tests. Use a remote starter to crank engine to prevent fire hazard or engine oiling system contamination.