Mechanical Inspection: Compression
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Engine mechanical condition can be checked using a compression gauge, vacuum gauge, or an oscilloscope capable of performing a relative compression test. See oscilloscope instruction manual for availability and description of relative compression feature. For procedures and specifications, see ADJUSTMENTS EFI article in this section.
CAUTION:
Use remote starter to crank engine during compression test, NOT ignition switch. Fuel injectors are triggered during the cranking mode. This could cause fire hazard, flooding, crankcase contamination, hydrostatic lock-up, or lubrication to be washed off of cylinder walls.