Vacuum lines, what to T and what not to T?

[2gGst98]

So I am going through my inspection and emissions, I replaced my battery a while back and never drove the car. (Have a work truck) none of the sensors are ready with a pending EGR checked engine.

While back I replaced my head, belt, and so forth. Every now and then my check engine light would come on for EGR. I have it hooked up, with a correct vacuum line diagram I got from here. I may have T'd into something I shouldn't have, so I will be going back through the vacuum system and re connecting everything per the diag below.

Question is - when I go about re doing all vacuum lines from throttle body to FPR, EGR, and all others, what can I T into and what can I not? Reason for asking is I need dedicated vacuum spot for BG and WG.

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I will be using this diagram unless another one is better. All the vacuum lines on TB are being used, so where do I get vacuum for my BOV and boost gauge? Is their a way to add vacuum line spots or one line that is Ok to T for something other then BG or WG? I plan on running all emission components as I have link coming in a few months and can't delete yet.

I have read for this for a little bit and after all the threads none give me anything. So thank you for the help in advance.

 

[Gstclipse69]

I have my BG teed into the FPR. The bov does need a dedicated line. At least on a 1g intake manifold there is a port that was solely for the bov. I would think there should be something similar for a 2g.

 

[2gmitsueclipse]

This should be a bit more helpful as the emissions setups for the 2g vary, especially from 98-99:

http://www.dsmtuners.com/threads/taboo-speed-shop-vacuum-diagram-and-removal-for-1g-and-2g.198327/

 

[2gGst98]

Thanks a lot for all that.

Today I finally got to replacing and redoing my vacuum lines. Following my diagram under the hood. The P on the throttle body is unused. But I found my problem, a year or so ago I replaced my head with rebuilt one with all new components. When I did this, I used a 2ga intake manifold without knowing.

on the 2gb intakes the P is on the intake and the 2ga the P is on the throttle body. Took a little digging to find this but that is my problem. All is hooked up except where the electro vane connects to the P witch would be on the intake.

So my question now is, is their another place it can go?

 

[2gGst98]

Looking at the throttle body the A port looks to be after the throttle plate and the E looks to be before the throttle place. If so would I be able to T into the A port as the original P port would be after the throttle plate, would that work?

Not sure if it makes cense but it kinda works in my head .

 

[miliman13]

If you remove the TB and look inside you'll see that there is only one small tiny Port and that's what feeds the port's up top.

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This is behind the throttle plate.


I believe it feeds port E directly and the rest indirectly.. this is a 2g Tb in the pic and I recently rebuilt my 1gNa so it may vary, that's were i got my info.

Good luck.

 

[2gGst98]

So E would be on the intake side of the throttle plate? Thanks for the pic.

My main problem lies with the P port. As I have a 2gb throttle body and a 2ga intake I am missing the P port all together. I didn't realize this when I changed my head, andI have much to learn with DSM's. Just learning as I go.

Also can someone explain to me what the electro vane in the vacuum diagram pic above does?

 

[2gGst98]

Well just replying as I got my car to finally pass emissions.

So my problem is I have a 95 intake mani, and a 98 throttle body. This made it so I have no P vacuum port on either my TB or IM.

I ended up finding my vac lines where ran wrong, I ran all new vacuum lines as normal and just plugged the line that would go to P.

Not sure if it's bad or not but everything seems to be ok. I no longer have that random back fire and check engine light for EFR flow.