Mechanical Inspection: Compression
Engine mechanical condition can be checked using a compression gauge, vacuum gauge, or an oscilloscope capable of performing a cylinder balance test. See oscilloscope instruction manual for availability and description of relative compression feature.
CAUTION:
On fuel injected models, use a remote starter to crank engine during compression test, NOT the ignition switch. If use of remote starter is not possible, remove fuel injector(s) wire harness connector. This will prevent triggering of fuel injectors during the cranking mode. Triggering of fuel injectors during test cranking of engine could create a fire hazard, flooding, crankcase contamination, hydrostatic lockup, or lubrication to be washed off of cylinder walls.