S4 Quattro Cabriolet V8-4.2L (BHF) (2008)
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Disconnect electrical harness connectors - 1 to 4 -.
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Remove ignition coils - arrows -.
‹› Extractor (T40039) can be used for removal.
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Using spark plug removal tool (3122 B), remove spark plugs.
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Open throttle valve completely.
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Check compression using compression tester (V.A.G 1763 ).
‹› Using the compression tester => Operating instructions.
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Have a second technician press accelerator pedal completely and at the same time operate starter long enough until pressure increase no longer
appears on tester.
Compression pressure:
Assembly is performed in reverse order of removal, noting the following:
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Secure fuel hose to connection on fuel rail pipe. To do so, counterhold using an open-end wrench at each hex head - 1 - and - 3 - and tighten union
nut - 2 - to 22 Nm.
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Install sparks plugs.