I got a lend of a friends vacuum tester so thought I'd go round all the pipes etc and they all seem good (providing I'm doing it right) apart from one, so thought I'd ask.

 

The tube goes from the back of the balance bar down to 2 tiny pipes under the passenge side intercooler pipes. I believe this to be the Carbon canister piping. So, I'm putting the vac tester/puller on the end that would normally fit to the balance bar, so I'm trying to suck from the carbon canister and it doesn't hold, just lets air go pretty quick.

 

Does this mean there's a vac leak down there or should it hold?

 

That will be the CC constant purge orifice "leaking" under vacuum conditions (as it should). The evap emission

control system is shown below and shows the basic setup (turbo models have an extra purge line which runs

from the CC to the intake pipe near the air filter.

 

I've also attached the relevant page from the FSM which describes the CC fuel vapour purging process: efec-190.pdf

 

Top answer Andrew [emoji106]

Thanks very much for taking the time to reply Andrew. I just thought I might have a vac leak.

 

So, looking at this picture, im assuming the other pipe there under the if piping should be connected to the throttle body. On mine, the throttle body nipple is plugged/blocked and the other pipe under under the ic isn't connected to anything. Is that a problem?

So is this about right?

Anyone know whether this other pipe should be fitted or not? or if it doesn't matter

So is this about right?

 

Yes, plus the extra extra purge line which runs from the CC to the intake pipe near the air filter. The n/s throttle connection

runs to the CC purge control valve. If is not connected the CC will not purge properly as the manifold vacuum increases.

 

"the other pipe under under the ic isn't connected to anything" what does it connect to on the CC? It may be the second

purge line. Connection types are marked on the CC.

Yes, plus the extra extra purge line which runs from the CC to the intake pipe near the air filter. The n/s throttle connection

runs to the CC purge control valve. If is not connected the CC will not purge properly as the manifold vacuum increases.

 

"the other pipe under under the ic isn't connected to anything" what does it connect to on the CC? It may be the second

purge line. Connection types are marked on the CC.

 

The pipe under the IC pipes I'm meaning is the 1 of 2 - one goes to the back of the balance pipe and the other is currently going to nothing. I'm guessing this one should be going to the throttle body. I'm guessing to see what things are connected to on the CC would mean taking the bumper off?

 

Is there any pictures of the vac pipe that goes near to the air filter? I don't recall seeing one down there apart from the recircs

This is a photo from:

 

http://s95014253.onlinehome.us/63104/6901.html

 

 

Not very clear, but it does exist!

 

You can get to inspect and identify the CC connections by removing the wheel and wheel arch liner. The

removal guide has pics which should help.

This is a photo from:

 

http://s95014253.onlinehome.us/63104/6901.html

 

[ATTACH=CONFIG]96476[/ATTACH]

 

Not very clear, but it does exist!

 

You can get to inspect and identify the CC connections by removing the wheel and wheel arch liner. The

removal guide has pics which should help.

 

So that little pipe looks like its just above the CC in the other pictures, so its not next to the air filter as in under the centre panel?

 

I guess my main thing is, I just want to make sure there's no vac leaks. So it could be worth me just capping off the balance bar which would eliminate the CC right? So if no difference when doing this then I'm guessing its fine.

 

Might be worth me reconnecting the pipe back to the throttle body though, I don't get why that's been done but I noticed on the simplified vac pipe photos that the nipple at the throttle body is often capped so the CC must be remove on that simplified version

So that little pipe looks like its just above the CC in the other pictures, so its not next to the air filter as in under the centre panel?

 

It's been a while since I did the CC remove (and then refit) so I'm going from memory. Just look at the intake piping starting from

the air filter and work back from there.

 

Update

 

Here is a picture showing actual location:

 

Edited April 22, 20169 yr by AndrewG

Out of interest are you thinking you have a boost leak?

 

Jeff

Out of interest are you thinking you have a boost leak?

 

Jeff

 

I'm not really sure tbh Jeff. Kind of following on from my post about spark plugs the other day. I'm not really sure whether they look right but I'm not convinced they do. This thread if you'd be happy to give your opinion.

http://www.300zx.co.uk/forums/showthread.php?184435-spark-plugs

 

 

so I'm looking to see if I can find any small leaks etc. I've tried a boost leak test and didn't find anything, was only using a tire pump though which isn't really good but it was holding it around 3.5psi. So going through the vac pipes but I've often wondered why the pipe from the throttle body to the cc wasn't connected, certainly doesn't seem to be any air going in or coming out of the pipe.

 

I do any that when the car is cold, it seems to have a small misfire. Ohm tested all the injectors and they were all pretty much identical.

I do have very slight hesitation on touching the accelarator too. The O2 sensors aren't pluged in so do to you think any of this could be that?

I do have very slight hesitation on touching the accelarator too. The O2 sensors aren't pluged in so do to you think any of this could be that?

 

I had the same thing and just solved it by replacing the old IC-tube's. After taking of the old ones I saw they were slightly cracked.

Mike

Thanks mate, this no longer matters at the minute but as the car is in bits, I've ripped the cc out lol

see ive removed my carbon canister... abit of a pointless item.