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post #1 of 14 Old 11-06-2015 Thread Starter
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Sucking sound!

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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post #2 of 14 Old 11-06-2015
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Pretty sure that is the PVC. I got one off of ebay and seem to be lasting.
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post #3 of 14 Old 11-06-2015
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PVC .... it lets the engine breath correctly. .... Replace it.
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post #4 of 14 Old 11-06-2015 Thread Starter
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Thanks guys! Is it worth cleaning, or just replace?
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post #5 of 14 Old 11-06-2015
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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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post #6 of 14 Old 11-06-2015
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If it is already sucking air, then it's dead Jim! Time for a new one.
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post #7 of 14 Old 03-04-2017
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Does anyone know how the PCV works?

Does anyone know how the PVC works?
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post #8 of 14 Old 03-04-2017
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How does a positive crankcase ventilation (PCV) system work? | HowStuffWorks

If you need a new one, best get a VW one - lots of people have bought duff PCV valves on ebay and gone the VW route in the end.

VW Touareg models are as follows:
Generation 1: T1 is model 7LA & facelift T2 is model 7L6
Generation 2: T3 is model 7P5 & facelift T4 is model 7P6
Generation 3: T5 is model CR7 [Not available in "VW Atlas" North America!]
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post #9 of 14 Old 03-06-2017
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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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post #10 of 14 Old 03-06-2017
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You haven't described any symptoms.

VW Touareg models are as follows:
Generation 1: T1 is model 7LA & facelift T2 is model 7L6
Generation 2: T3 is model 7P5 & facelift T4 is model 7P6
Generation 3: T5 is model CR7 [Not available in "VW Atlas" North America!]
Read Wikipedia:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

T1 & T2 buyers MUST read:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

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