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Home >> GMC >> 1995 >> Jimmy 4D Utility, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 32 (Engine Controls - Basic Testing - 3.1L) >> Preliminary Inspection & Adjustments >> Mechanical Inspection >> Compression
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Mechanical Inspection: Compression

WARNING: This page is about a different car, the 1995 Pontiac Trans Sport and 1995 Chevrolet Lumina APV. However, it is still accessible from the selected car via links, so may be relevant.

Check engine mechanical condition using a compression gauge, vacuum gauge or engine analyzer capable of performing a relative compression test. If using engine analyzer, see engine analyzer instruction manual for availability and description of relative compression feature.

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's oiling system contamination.
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