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Discussion Starter #1
My 04 V8 with 175000Mi on it, started idling really uneven, multiple misfires on all cilinders.

O2 sensor upstream bank 1 was bad. I replaced all four O2 sensors.

Still get "System too lean" on both banks.
(I also know my catalytic converters are shot)

In the egine bay, there is a loud sucking sound coming from the little disc located on top and back side of the intake manifold, more to the driver's side. When I put my hand over its opening, (preventing air entrainment) then the idling improves.

Any ideas?
 

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PVC .... it lets the engine breath correctly. .... Replace it.
 

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some people clean .... but you must have patience of a saint and a delicate hand like a surgeon .... otherwise you'll snap the lugs which hold the unit together
 

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If it is already sucking air, then it's dead Jim! Time for a new one.
 

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How to check the pcv fail?

noobytoogy,thanks a lot!
But i am still wondering how to check my V8 PCV.How to make sure that the valve is a failuer or not?
Some tech man told me to open the oil cap when the engine was running to check,I just can not to make a judgement.
 

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You haven't described any symptoms.
 

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PCV: Positive Crankcase Ventilation

A PCV valve simply allows pressure buildup in the crankcase to escape. The pressure buildup is caused by blow-by around the piston rings.
 

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PVC: Polyvinyl chloride

The world's third most common synthetic material used to make pipes, bottles, etc.
 

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Ha! That's like the me always calling the MFD [the dash display] the MDF!!
 

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can i use 077 103 245B to replace my old PCV?

06 touareg v8 PCV type is 077 103 245B.Does anyone know can i use 077 103 245C to replace it which is for the VW Passart?I really do not knot the difference between 245B and 245C.
Thanks a lot!:smile2:
 
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