I have discovered that my 4th Gen VTEC intake has a small pipe attached to the rubber intake pipe(as well as the PCV valve) which is an "air bypass valve". This is to control the secondaries on the intake.

Does anyone know how it works?

I am fitting a Type-S intake pipe which doesn't have the same hole. Do I need this "air bypass". Is it drawing a vacuum from it or is it blowing air into it...

Anyone explain?

 

umm I think you're talking about the Idle Air Control Valve, not the IAB valve...where does the air line connect to the intake hose?

 

This small pipe connects to the rubber intake pipe just before the throttle body. It then loops up over the intake manifold and down to what is some diaphram thing connected to the intake manifold. Is it not the IAB? Am i wrong?

I have an intake pipe from a 5th Gen VTi (with the dynamic chambers box) which I am fitting to my 4th Gen VTEC. This rubber pipe on the intake doesn't have this extra connection. I want to know what to do with it. What does it do? It won't easily pull out from the pipe either, so I am being carefull.

My best plan is to cut up my existing 4th gen pipe with this connection and use that. But I wanted to keep the original in case I make a mess of fitting this Type-S one.

Tim

 

You are right! Its the idle control valve. Ive just had another look.

Couldn't get the car to run right without it. So I have drilled another hole into my Type-S rubber intake pipe and retro fitted the pipe. Now everything is running as normal. But, the metal end of the pipe protrudes into the intake, whereas in the original 4th Gen pipe it is concealed virtually.

Intake roar sounds deeper than before. Must be breathing better now with the tampered design and dynamic chambers...

Tim