Assessing The Problem

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A pressure loss test can be carried out in order to determine the extent of the problem more precisely following a compression pressure test. The leak is located by listening for sounds of escaping air.

The following areas can be checked:

Intake manifolds (checking intake valves)

Exhaust manifolds and exhaust pipes (checking outlet valves)

Positive crankcase ventilation and oil filler neck (checking piston rings)

Coolant filler neck and spark plug bore of adjacent cylinder (checking cylinder head gasket)

Recommended tester (from Leitenberger Autotestgerate):

Fig 1: Identifying Pressure Loss Testing Tool

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Pressure gauge, Leitenberger, Item No. DRV 05 (041113)
Pressure-regulating valve on pressure gauge
Dead-center position gauge, Leitenberger, Item No. OT 04 (041310_1)
Adapter, ZKS 01.1, plug thread M14 x 1.5 and M18 x 1.5