i recently purchased my car, apon looking at the egine bay i saw 2 strange things... in both of the pictures it seemed like they used some plugs to block off some parts and i was wondering if these were important. sry that the pictures arent that great.

 

the first one goes to the air intake tube, there should be a rubber hose between the two. The second goes to a valve on your intake that opens and closes for some stupid reason so it is useless. For the first I recomend getting a piece of hose to connect them.

 

there's an aftermarket intake installed and the first part is where an unnecessary tube has been blocked off. the second one is usually blocked off on the TB.

yeah it's fine, they should be there and stay there.

 

shouldn't he put a breather filter on his valve cover cause that is where that hose goes.

 

oh yeah, i didn't notice the valve cover. there should be something running from the intake tubing to the valve cover, i am not sure why that is disconnected.

 

There should be a hose between the first circled piece and the valve cover. The other cap is where the intake resonator gets vacuum, which you can leave capped if you have an aftermarket exhaust.

 

Yup, looks like your car has been modded. Just got get a rubber hose and reconnect them.

A breather filter would be fine also.

 

He didnt circole where the hose goes thats just somethign we all noticed but he circled something by it which i cant see what it is...

 

that's the crankcase breather tube on the top...it's illegal here to have that open venting into the atmosphere...even filters are...you should just reconnect it. the other plug is fine...either it was from an aftermarket intake...ir it's one of the vacuum lines that is always plugged

 

im getting a vacum leak somewhere, its not b/c of that plug on the throttle body right? the block i bought didnt have an intake, i didnt want to run open throttle body so i just put a filter on the throttle body for now. so that doesnt really count as an intake so, should i take the plug off? or connect it somewhere?? i cant find a broken line or anything anywhere, it revs up by itself when its warm or cold.

thanks for everyone's help. this forum is alot better than the one i was at

 

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 99bb6 &raquo;</TD></TR><TR><TD CLASS="quote">

im getting a vacum leak somewhere, its not b/c of that plug on the throttle body right? the block i bought didnt have an intake, i didnt want to run open throttle body so i just put a filter on the throttle body for now. so that doesnt really count as an intake so, should i take the plug off? or connect it somewhere?? i cant find a broken line or anything anywhere, it revs up by itself when its warm or cold.

thanks for everyone's help. this forum is alot better than the one i was at </TD></TR></TABLE>

At some time that engine had a cold air intake fitted, the pipe in the first pic goes between the breather on your valve cover and the other end connects to a breather tube that was on the stock rubber intake. It has been left on as it is joined to the coolant connection and is easier left in position rather than having to replace the coolant line. The second plug on your intake manifold just caps off what used to be a rubber pipe that went to the IAC valve that would have been sitting at the back of the battery, you should just see a metal bracket where that IAC used to sit. If you either connect a stock intake pipe and air box you can rig the pipes back to where they came from, or better still buy a cold air intake and you can just connect a pipe back to your CAI and put the other end on the breather on your valve cover, the little plug on the intake manifold can stay there.

 

your vacuum leak might be this:


That is the IAB vacuum hose. Looks like it is not connected. it would cause idle problems.

Pirate

 

damn, that just might be it. if i get a hose where do i connect it to? or can i just block it off. sry guys im new to the game

 

?

 

The thing you have blocked on the intake mani and the thing that he pointed out on the other side, I connected those two with a hose when I installed my CAI. Not a problem since. The other piece that chills out around the valve cover got burnt of with a propane torch.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 99bb6 &raquo;</TD></TR><TR><TD CLASS="quote">
damn, that just might be it. if i get a hose where do i connect it to? or can i just block it off. sry guys im new to the game </TD></TR></TABLE>

 

Block it off for now. If you can find it, There's a little black box on the bottom of your intake manifold. It uses that vacuum line to turn the IAB's. Your picture doesn't go far enough over to the right to show me if your diaphram is connected or not.

The IAB's change the runner length in your intake from long to short. It boosts the torque down low, or if you look at it the other way, it boosts your high end.

Look at the Vacuum diagram on the underside of the hood. It will show you in simple view where everything goes.

Props to PIRATE. Good eye.

 

Hmmm, thats some interesting info because i am in the process of swapping an H22 into my prelude Si and that little black box has the nipple broke off on both engines and i was going to ask on here what i should do about it. Is it a big deal to eliminate that box and connect the two places together like the one post above says or should i try and find another black box to replace my broken one?

 

this is an easy way to tell nobody is looking at the essential prelude links section to find the vacuum diagram link....

 

Like nsxlr8 said look for a 3x4x2" black box on the driver's side of the intake manifold. Look for a loose hose there. In the meantime you can block off that vacuum hose. you will just lose some low end torque. I can take a pic of the box and hoses if you need.

Pirate

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by satan_srv &raquo;</TD></TR><TR><TD CLASS="quote">that's the crankcase breather tube on the top...it's illegal here to have that open venting into the atmosphere...even filters are...you should just reconnect it. the other plug is fine...either it was from an aftermarket intake...ir it's one of the vacuum lines that is always plugged</TD></TR></TABLE>


on a lot of the aftermarket intakes, they have a nipple where you would
connect the crankcase breather tube. one problem i have seen with those
is that the nipple is too small which causes more crankcase pressure.

i had a breather on mine, then it took a **** so I reconnected the tube to the
intake, a week later my rear main seal went out. Not to say that it wasn't
gonna happen eventually, but i believe the excessive crankcase pressure
could have contributed to it failing when it did.