lexus-is2

This might sound like a silly question, but that extra hose connection on the side of the intake where the small hose comes and connects to, where does this come from? If this is loose or not tightened can it cause a vacuum leak?

MikeFig82

iTrader: (13)

Yes it will cause a vacuum leak. It attaches to the valve cover. You should be able to see where it should hook up to.

lexus-is2

Thanks, the stock pipe in that connection area has a slight hump and dip so that when hose goes in and when you tighten the clip it is 100% sealed. The Joe Z one seems like a straight pipe. So no matter how much you tighten it will it actually fully seal?

Sorry,might be a silly question but what exactly is the purpose of it being connected to the valve cover?

MikeFig82

iTrader: (13)

If the stock hose clamp is not applying enough pressure. Get a small worm hose clamp. That should help it seal better. Just don't overtighten it. Snug it up just enough so you can't pull it off. Read the the following link. For the answer to your second question.

https://en.m.wikipedia.org/wiki/Crankcase_ventilation_system

lexus-is2

Thanks for the link. It talks about the PCV to vent the crankcase. But isn't the PCV valve at the back right of the manifold? This hose that connects to the intake doesn't seem to go to 'the PCV at the back right. Am i missing something

MikeFig82

iTrader: (13)

It's in the link. Read the section titled components.

andygill27

Are these intake tubes still for sale anywhere? Checked mod in Japan already...