Mechanical Inspection: Compression
Check engine mechanical condition with a compression gauge, vacuum gauge, or an engine analyzer. See engine analyzer manual for specific instructions. Depressurize fuel system before checking engine compression. See FUEL SYSTEM below in this article.
CAUTION:
DO NOT
use ignition switch during compression tests on fuel injected vehicles. Use a remote starter to crank engine. Fuel injectors are triggered by the ignition switch during cranking mode, which can cause a fire hazard, or contaminate the engine's oiling system.
COMPRESSION SPECIFICATIONS
| Application | Specification | ||
|---|---|---|---|
| Compression Ratio | 9.5:1 | ||
| Compression Pressure | (1) 160-170 psi (11.2-12.0 kg/cm2 ) | ||
| Maximum Variation Between Cylinders | 10 psi (.70 kg/cm2 ) | ||
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