My idle was fluctuating only when the car was warmed up. I thought the problem was due to me not fully bleeding the cooling system after a thermostat change, but that wasn't the case when I noticed this unplugged/uncapped nipple. After capping it, my idle problems went away.

This is a jdm intake manifold and I don't know what's supposed to go to this nipple. Is it to be capped, or is something more important supposed to be hooked up to it?

..and if it's the former, do autoparts stores carry such small plugs?

 

weird. my euro ITR dont have that nipple. only vacum for purge solenoid, FRP, brake booster and check valve to black box

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by erikiksaz1 &raquo;</TD></TR><TR><TD CLASS="quote"> , do autoparts stores carry such small plugs?</TD></TR></TABLE>

Yes.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by erikiksaz1 &raquo;</TD></TR><TR><TD CLASS="quote"> ..and if it's the former, do autoparts stores carry such small plugs?</TD></TR></TABLE>

Heat and 15 lbs of vacuum will eventually snap the top off of the cheap ones. Hopefully you find a decent one. (something to keep in mind when the vacuum leak comes back in a year)

 

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

Heat and 15 lbs of vacuum will eventually snap the top off of the cheap ones. Hopefully you find a decent one. (something to keep in mind when the vacuum leak comes back in a year)</TD></TR></TABLE>

I've had a rubber cap on my Inake Manifold for for almost 3 years. Two of them to be exact. Of course rubber isn't the most durable material, but it's a feasible solution.

 

there is supposed to be a vaccuum line that goes to that port on the intake and the other end to the evap canister

 

OT: 15lbs of vacum? either you have vacum or you dont...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ITRnorway &raquo;</TD></TR><TR><TD CLASS="quote">OT: 15lbs of vacum? either you have vacum or you dont... </TD></TR></TABLE>

Your intake manifold will have various levels of vacuum while it's running. It'll only be at atmospheric pressure if it's stopped. It'll be close to 1 atmosphere of vacuum, when letting off throttle at high RPM. An atmosphere is 14.7 PSI. It'll also be close to 0 (atmospheric pressure) when at high throttle angles and lower RPM.

 

Chris is right...I used a vac nipple and the thing pretty much dry rotted off. I got some idle surge and was like woah. i checked the mani and sure enough it looked like rats had been chewing on the rubber.

 

That port is for a vacuum line that runs to the EVAP Purge control solenoid (and then to the EVAP canister). When I swapped my 97 ITR motor into my civic, I simply reused the D15 EVAP solenoid, and zip tied it to the wire harness underneath the intake manifold. Stock OBD-1 Civic EVAP system w/ ITR motor.

If your EVAP solenoid was on your previous manifold, just remove it, and zip tie it underneath. If you've done away with the EVAP system, then just cap that port off...

 

get some rubber hose that fits, then put a 10mm bolt in the open side with a zip tie tightly around it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by walker111 &raquo;</TD></TR><TR><TD CLASS="quote">get some rubber hose that fits, then put a 10mm bolt in the open side with a zip tie tightly around it.</TD></TR></TABLE>

Works like a charm.

 

I've had a rubber cap on mine for about 2 years with no problem. Only a couple of cents.