90 Quattro 20V (Canada) L5-2309cc 2.3L DOHC (7A) (1989)
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Compression Check: Testing and Inspection
PREPARATION
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Engine oil temperature 30°C (86°F) minimum.
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Throttle valve fully opened.
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Disconnect power output stage of ignition coil.
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Remove all spark plugs.
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Remove fuse 13.
TEST
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Check compression pressure using US 1120 recorder/tester.
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Operate starter until recorder shows NO further increase in pressure.
New =
10 to 14 bar (145 psi to 203 psi)
Limit =
8 bar (116 psi)
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Maximum permissible difference between all cylinders: 3 bar (44 psi)
