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Thread: Need help, EGR / vacuum hoses

  1. #1
    Registered User robftw's Avatar
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    Default Need help, EGR / vacuum hoses

    This is my first time messing with a piston engine (im a rotary guy) I was looking at the FSm and i cant figure out where these last few hoses connect to, i do not have AC Or a heater.

    Also, can i just take connect the engine out hose that normally connects to the heater core, and just send it directly to the return? Does anyone know if it will cause any over heating problems?


    Photobucket

  2. #2
    Registered User robftw's Avatar
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    Also might aswell post this here, i need a dropping resistor ASAP

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    I've seen it recommended that it's better to block off the water hoses than to bypass them. Search "heater" and "cooling" on Hybridz.


    Best guesses on the hoses -

    1. Ported vacuum from the throttle body - distributor vacuum advance and ??
    2. Same.
    3. Charcoal canister
    4. AC control reservoir
    5 or 6 - Brake booster, can't see the picture clearly.

    All memory and guesses but I think they make sense. When you get the engine in the car it will be more clear.

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    I wont be running the charcoal canister until i find one, i've heard stories that it can be... dangerous in hot weather, here in NY it'll be 90 one day and 50 the next i think i'll be okay for a week or two.

    Can i just plug the AC and canister hole for now? 6 is the large tube at the back of the manifold, 5 is an L shaped fitting, here is a better picture



    Also for the dizzy vacuum advance, im a bit confused, i only have 1 hose port on the distributor, the other hose is for?
    Last edited by robftw; 05-14-2011 at 09:03 PM.

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    Okay i've been reading pages of google and figured some stuff out,
    #1 is dizzy vacuum advance
    #2 is still unknown
    #3 is Charcoal can, i won't have one of these on my car for a while, can it be blocked off?
    #4 is AC as stated above, can this be blocked off?
    #5 runs back along the firewall to the other side of the engine bay, i dont know what this is for
    #6 is brake booster
    #7 Unknown


  6. #6
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    I found 1 picture in the fsm, it appears that #2 is the canister vacuum signal line, can anyone confirm this?

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    5 is vacum for the heat ac controls

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    Registered User robftw's Avatar
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    Quote Originally Posted by grantf View Post
    5 is vacum for the heat ac controls
    Thank you,

    If anyone is willing to take a picture of where this stuff goes it would be greatly appreciated.

    After looking at pictures i believe #2 goes to the charcoal can as well

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    Registered User cozye's Avatar
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    #7 is the fast idle for AC, comes off the magnet valve. Since you don't have that, you can remove that whole piece and clean up the manifold.

    I can't remember #2 and my car is at the painter.
    1978 280z 4sp

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    Thank you, this engine should be installed and running this weekend, the last thing i noticed is right here next to the tb intake, the black hose connects to it.. where is this hose supposed to lead to?

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    Oddly, that part on the throttle body (the dashpot) isn't really supposed to have a hose attached to it, appearances to the contrary. All the part does is to ease the throttle down when you come off the pedal.
    My last three sports cars while I still owned all three:

    2001 BMW Z3 Roadster 3.0i soft/hard top (sold)
    1966 Ford Mustang Coupe (sold)
    1978 Datsun 280Z (enjoying very much )

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    I think your #2 is the vacuum supply from the throttle body to the thermal vacuum valve, which supplies vacuum to the EGR system. I don't know what year your car is ('78?), but there's a vacuum tubing diagram in the Emissions Control section of the factory service manual, fig. EC-14. You can download the FSM for free, or you can buy a used hardcopy off of Ebay or Amazon. I prefer having the book, myself, because you can spread it out over your work area, unlike your computer.
    My last three sports cars while I still owned all three:

    2001 BMW Z3 Roadster 3.0i soft/hard top (sold)
    1966 Ford Mustang Coupe (sold)
    1978 Datsun 280Z (enjoying very much )

  13. #13
    Registered User robftw's Avatar
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    Hmm, i was looking at the diagram below for #2, since #1 is for the dizzy vacuum advance

    Also the car came with that hose already on it, i'm not sure what the previous owner did but i'm changing all of these brittle vac lines with nice silicone ones, some were missing and some are now (obviously) mis routed, like the one on my valve cover, i'm just going to connect that to the AFM boot.


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