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Sorry for a silly question -- but what is that hole I have on intake right near PCV (if I am not mistaken) hose which comes on top of the intake manifold. I tried it with finger while reving engine-- no vacuum was felt. So I guess it is not intended for anything -- then what is it for?

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Maybe just a bolt hole?

it is too deep to connect anything imho. Since I never took the intake off I am not sure on its "under" shape and what volume is functional -- At first I just wondered - may be there used to be a plug and the hole was to ease measurement of the pressure inside of the intake... but as I said when I checked it with finger -- I didn't feel any suction while engine was running.

I will check it more carefully tomorrow ;-)

I wonder if H4s also have it at all... or do all H6 have it simply open?

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being in a low spot on the intake, it could be a drain, so water (etc) doesn't collect a little pool. probably just a straight hole drilled through to the bottom, between all the runners.

just a thought, not absolute knowledge.

~Erik~

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Looks like the knock sensor hole to me!

 

::EDIT:: Yes, it looks like the knock sensor hole from where I can see the throttle cables.

 

the knock sensor hole is on the shortblock not the intake manifold on the 90's EJ series engines.

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