[sil84]

ok so i have a little problem i have a place on the back of my intake manifold where there should be a vacuum line so i caped it and after i did it made the car start idling low and almost dying out so i took the cap of and it started idling like it has been again at around 800-1000rpms very confused as to why it would idle down with it on but be fine with it off.

The only repercussion with it off it whistles when i get around 5000rpms, but i did drive it a little with the vacuum cap on and it seamed a lot fast with it on but won't idle not sure why and advise would be helpful. :thumbup:

also this is on a honda civic with a b16b with stock civic type-r intake manifold.

also here is a pic of the vacuum port it is on the back left off the intake manifold near the brake reservoir.

 

[spoolie]

its for you fpr...

 

[sil84]

its for you fpr...

the fpr hooks up to the front of the intake manifold at the top towards the engine. i think maybe it went to the charcoal canister? but not sure why capping it would make it idle down.

 

[jcoosi]

the fpr hooks up to the front of the intake manifold at the top towards the engine. i think maybe it went to the charcoal canister? but not sure why capping it would make it idle down.

Cause you were sucking air in.When at idle only air that should be entering the intake is through the idle air control valve.You had more air that was being picked up by the ecu through the map sensor so it idled it up.Basically the car thought you were sitting still and had the gas pedal mashed to where the throttle was partially open.

 

[hybridkyle]

Put the cap back on it, reset the ECU, adjust throttle according to Chiltons / Haynes

 

[ELI]

Put the cap back on it, reset the ECU, adjust throttle according to Chiltons / Haynes

There is a Chiltons / Haynes books for C.T.R's....?
No way!!!

 

[ECUAdam]

Sounds to me like its either a clogged/defective IACV, or you have the brass screw on your throttle body tightened too much. If its extra just cap it off. If you have to make vacuum leaks for your car to idle right then something is wrong.

 

[sil84]

Put the cap back on it, reset the ECU, adjust throttle according to Chiltons / Haynes

resting won't work with hondata s200 cause it should keep all the setting in memory for a while

Sounds to me like its either a clogged/defective IACV, or you have the brass screw on your throttle body tightened too much. If its extra just cap it off. If you have to make vacuum leaks for your car to idle right then something is wrong.

i'll check all of that this weekend thanks man. :thumbup:

 

[spoolie]

cap it off and retune the hondata...easy

 

[hybridkyle]

There is a Chiltons / Haynes books for C.T.R's....?
No way!!!

No, but adjusting the idle will be the same....

resting won't work with hondata s200 cause it should keep all the setting in memory for a while

:thumbup:

I was unaware of you having a Hondata...so, it NEEDS to be capped off. It will just need to be retuned I guess.

 

[undr_boost]

if you cap it and it idels low, you should try tee'ing it off to another vacuum source. I wouldnt cap it off and retune it with hondata. Thats a waste of time and money if you are going to have someone tune it for a dumb cause. But from the looks of it, it looks like that "might" be the vacuum line for the master cylinder that runs into the firewall. I could be wrong though, as the port tube looks small. Or it might be the vacuum source for cruise control.

 

[aye bee]

cap it off and bump up your idle

 

[EastTennBimmin]

What he said^ Should have a screw somewhere in the mani to adjust the idle...