Allroad Quattro V8-4.2L (BAS) (2004)
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Disconnect connector -3- at evaporative emission (EVAP) canister purge regulator valve -N80- item -2-.
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Detach solenoid valve from holder.
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Disconnect connector -4- at mass air flow sensor.
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Turn hose -1- to secondary air pump counter-clockwise and detach.
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Detach air hose -5- at mass air flow sensor.
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Screw out bolt (arrow).
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Take out air cleaner housing with mass air flow sensor.
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Remove bolts -5- and -6- at left cylinder head.
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Disconnect connectors -1 -to -4-.
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Pull out ignition coils (arrows).
Note: Special tool T10094 can be used for removal.
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Remove bolts -5- and -6- at right cylinder head.
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Unplug connectors -1 -to -4-.
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Pull out ignition coils (arrows).
Note: Special tool T10094 can be used for removal.
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Use spark plug wrench 3122B to remove spark plugs.
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Fully open throttle valve.
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Use compression tester VAG 1763 to check compression pressure.
Note: How to use tester
Refer to Operating instructions
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Operate starter until no further increase in pressure is indicated by tester.