996 TT inlet manifold vacuum/boost leak help
Discussion
Hiya,
Been trying to narrow down the cause of my catastrophic vacuum / boost leak, managed to find the fuel pressure reg vac hose had popped off, so sorted that and now the car runs so so much better. Tested again (with the air box off), i could hear a fairly big leak coming back down the unpressurised intake manifold, the big oval shaped one aluminium (1199611062272 Intake manifold) one running down the left hand side of the engine so I reached in expecting it to be leaking diverter valves, but no. Plus I had tested the vacuum side of the diverters earlier and they held fine. Reached into the inlet further and there is another inlet into the manifold about the diameter of my small finger, probably another four inches further back from the diverters intake and coming from the centre of the car, and i don't know what connects to this, therefore i'm stuck. This is where the leak is coming from, put my finger in it and... no more leak. let go and Ptshhhh... so thats where the problem is.
I've been over all the parts diagrams i can find and the one that shows the intake manifold, sadly shows the wrong side of it, and does't show the hole where the diverter valves connect, or this other connection. I've been over the other diagrams and again, i just can't find what's feeding this. It's no show on the vac circuit, breather circuit etc, that i can see.
Hope anyone who's pulled this apart and knows can help!!!
Thanks in advance
J
Been trying to narrow down the cause of my catastrophic vacuum / boost leak, managed to find the fuel pressure reg vac hose had popped off, so sorted that and now the car runs so so much better. Tested again (with the air box off), i could hear a fairly big leak coming back down the unpressurised intake manifold, the big oval shaped one aluminium (1199611062272 Intake manifold) one running down the left hand side of the engine so I reached in expecting it to be leaking diverter valves, but no. Plus I had tested the vacuum side of the diverters earlier and they held fine. Reached into the inlet further and there is another inlet into the manifold about the diameter of my small finger, probably another four inches further back from the diverters intake and coming from the centre of the car, and i don't know what connects to this, therefore i'm stuck. This is where the leak is coming from, put my finger in it and... no more leak. let go and Ptshhhh... so thats where the problem is.
I've been over all the parts diagrams i can find and the one that shows the intake manifold, sadly shows the wrong side of it, and does't show the hole where the diverter valves connect, or this other connection. I've been over the other diagrams and again, i just can't find what's feeding this. It's no show on the vac circuit, breather circuit etc, that i can see.
Hope anyone who's pulled this apart and knows can help!!!
Thanks in advance
J
Edited by kyepan on Sunday 19th July 16:44
A useful chap over on rennlist suggested that it might be the outlet of the top oil tank breather.
shown top the photo running from the oil tank across
Any idea how i can pressurise the system more successfully without encountering this issue?
Caveat - my home made test bungs, fit the inlet of the turbos, but are too small to fit the outlets.
cheers
J
shown top the photo running from the oil tank across
Any idea how i can pressurise the system more successfully without encountering this issue?
Caveat - my home made test bungs, fit the inlet of the turbos, but are too small to fit the outlets.
cheers
J
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