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Looking for advice and answers about the vacuum pump.

valfam
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valfam Member

valfam

Posted
Posted

2008 S.
I'm looking for advice and I have a few questions, the Cayenne S that I'm working on that I'm replacing the valve cover gaskets well doing that I found a broken hose, that it turns out to be the vacuum pump hose, while reading up on the vacuum pump I read that they tend to leak and they go bad often, I have not taken it apart yet so I don't know if it has a problem yet but with the Cayenne pushing over 200K I think I should replace it while I have the valve covers off. now the questions. Has anyone replace the vacuum pump yet? Do they go bad as often as I read? how does it leak oil and from where? it looks pretty simple. two oil rings to the head and one in the rear with a backing plate. Does anyone know what the vacuum connection do? the pump had a small vacuum line port with a small vacuum line going into it and a larger line going to the firewall. the strange thing is the large line that I saw cracked on both ends the car still had power brakes where is it getting vacuum from, unless its getting vacuum from the smaller line. one last question. where is it sucking air out of? it can't be the head, or the intake, it is from a manifold that then has lines running to a bunch of different locations?

Sorry for all the questions I like to know how things work.

JE 17 Member

JE 17

Posted
Posted

All data has a diagram. I’m looking at it since I’m getting codes for a bad Valve Lift Controller and the pump has to come off to allow access.

i can’t address all your questions but the smaller hose is for the transmission signal and the larger one for brake assist.

valfam Member

valfam

Posted
  • Author
Posted
22 hours ago, JE 17 said:

All data has a diagram. I’m looking at it since I’m getting codes for a bad Valve Lift Controller and the pump has to come off to allow access.

i can’t address all your questions but the smaller hose is for the transmission signal and the larger one for brake assist.

thanks for the information. I took the pump off today and it had lots of oil in it, is that normal?

  • 4 weeks later...

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