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Jetta L4-1781cc 1.8L SOHC (ACC) Can (1995)

Engine, Cooling and Exhaust > Engine > Compression Check > System Information > System Diagnosis > Compression Test > Page 1379

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Compression Check: Testing and Inspection
Leak-Down Test

LEAK-DOWN TEST: 

The most conclusive diagnosis of low compression symptoms requires a leak-down test. Using a special tester and a supply of compressed air, each
cylinder is pressurized. The rate at which the air leaks out of the cylinder, as well as the sound of the air escaping, can more accurately pinpoint the
magnitude and source of the leakage. Any engine compression diagnosis that will require major disassembly should first be confirmed by a leak-down
test.

Engine, Cooling and Exhaust > Engine > Compression Check > System Information > System Diagnosis > Compression Test > Page 1379

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