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

Posted by 2gGst98, Jul 18, 2016

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  1. 2gGst98

    2gGst98 Proven Member

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    Concord, North Carolina
    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.

    . image.jpg 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.
     

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    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  2. Gstclipse69

    Gstclipse69 Proven Member

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    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.
     

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    1999 Mitsubishi Eclipse GSX
    · 2G DSM
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  3. 2gmitsueclipse

    2gmitsueclipse DSM Wiseman

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  4. 2gGst98

    2gGst98 Proven Member

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    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?
     

    Attached Files:

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    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  5. 2gGst98

    2gGst98 Proven Member

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    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 :idontknow:.
     

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    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  6. miliman13

    miliman13 Proven Member

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    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. 1469383875814-1773517986.jpg
    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.
     
    Last edited: Jul 24, 2016

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    manual · 2G DSM

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  7. 2gGst98

    2gGst98 Proven Member

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    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?
     
    Last edited: Jul 24, 2016

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    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  8. 2gGst98

    2gGst98 Proven Member

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    Concord, North Carolina
    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.
     

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    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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