I am removing my intake air tube to put on a IAT bung.

I thought there was only an MAF sensor harness on the tube but there were two other hoses and I am not 100% what they are.

One runs from Green to Green and the other from Orange to Orange

- I suspect Orange Orange. Intake Tube to beneath intake manifold. I suspect it has to do with idle air control and connects to what appears to be a solenoid under the intake manifold. I have no idea how this mechanism works - what is it called so I can google?

- the second goes from Green to Green. Intake Tube to side of head (where I see some people have tiny little breathers sometimes), what is this?

As i go Turbo, where do I connect the idle hose? where to I connect the head hose?

 

Green to green is the crankcase vacuum. You can either vent it to atmosphere or hook it to your turbo inlet with a catch-can inline.

There is no hose traveling from orange to orange. The idle tube sits just to the right of your green circle.

 

PCV hook up somewhere in your intake/charge system. If you connect post turbo be sure to have the check valve as to not further pressurize the crankcase. I usually hook PCV from Valve cover to a catch can, back into the intake pre turbo. Look in the engine bay thread to get a better idea of where people traditionally route them as I only have turbo experience on Nissan, Subaru, and fwd bp.

IACV Needs to be hooked up as to allow a small amount of metered air to bypass into the intake manifold when the throttle butterfly is closed.

 

Thanks Sav, sorry I should have explained: that is not my engine bay.

Orange went from the intake air tube (approx 1/2" OD) to beneath the inlet of the air intake manifold.

Pictures here:




The removed intake tube has a little bung where I had orange

The intake manifold has the inlet under the sock

 

Aha!

 

Thanks Sav, I see what you are saying - slight mis-communication on my part.