Mechanical Inspection: Compression
Check engine mechanical condition using 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.
COMPRESSION SPECIFICATIONS
| Application | Specification | |||||
|---|---|---|---|---|---|---|
| Compression Ratio | ||||||
| SFI | 9.5:1 | |||||
| TBI | 8.9:1 | |||||
| Compression Pressure (2) | ||||||
| Standard | (1) 199 psi (14.0 kg/cm2 ) | |||||
| Limit | (1) 170 psi (12.0 kg/cm2 ) | |||||
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