TVV ( Thermal Vacuum Valve) hose placement (1 Viewer)

[polloelastico]

I just replaced on the vacuum hoses under my intake and was pretty careful with routing the new lines. However, the TVV lines were not connector to the TVV itself when I took off the intake so I wasn't able to take note of which line went where.

There is a pair of lines that exit the lower intake and go to the TVV, does it matter which line attaches to which nipple of the TVV, or is it just an open/close loop controlled by the TVV? I looked in the FSM and wasn't able to find an answer.

 

[diamondfj]

I just replaced on the vacuum hoses under my intake and was pretty careful with routing the new lines. However, the TVV lines were not connector to the TVV itself when I took off the intake so I wasn't able to take note of which line went where.

There is a pair of lines that exit the lower intake and go to the TVV, does it matter which line attaches to which nipple of the TVV, or is it just an open/close loop controlled by the TVV? I looked in the FSM and wasn't able to find an answer.

Do the attached pages help at all?

 

[polloelastico]

Yes, thank you!

 

[flintknapper]

 

[effjay80]

Is it humanly possible to replace a bad TVV on the block without removing the exhaust manifold up top?

 

[CharlieS]

Based on my reading of the FSM and forum posts, it is just a bimetallic valve that opens once the coolant reaches a particular temperature and allows vaccum to pass. The direction of hoses shouldn't matter in the least.

Anything is possible. I think in this case, you might benefit from skinny arms and the right tools. It is under the rear half of the lower plenum, blocked by an intake runner. You might lave better luck attacking it from underneath if you are going to attempt it without removing the plenum. It is sure to be a hassle.