A8L V8-4.2L (BFM) (2004)
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Camshaft Position Sensor: Description and Operation
Camshaft Adjustment, Function
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The adjustment of intake camshaft is load- and RPM dependent. Exhaust camshafts are not adjusted.
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Oil pressure is switched to camshaft adjusters (mechanical adjustment devices) via the solenoid valves for camshaft adjustment.
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The camshaft adjusters then set intake camshafts of both cylinder banks to the direction "early", meaning that the intake valves open earlier.
