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Discussion Starter #1
Good morning,

I have a 2013 Audi S7 with an excessive amount of crankcase vacuum on idle whether it's warm or cold. I had previously changed the PCV system and oil separator due to whistling and mild crankcase vacuum but still had mild pressure after repair. six months later the car now has the oil cap suctioned to the Motor and has to be removed with force (full vacuum). Upon removing the oil cap the Engine RPM's increase slightly along with a sound air being sucked into the motor. Replaces the oil separator/vent valve again (new from Audi both times) and still full vacuum. Currently reading B1S2 o2 too lean and fuel trim is way rich -15.
 
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