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Thread: Fixin leaks.

  1. #1

    Default Fixin leaks.

    Running through my 85 RS 5.0 and I came upon the vacuum switch on the back of the manifold had nothing going to it. All of the emissions have been disconnected and i am trying to get things buttoned down.
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    what NEEDS to be plugged in and where.
    Thanks

  2. #2

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Size:  48.4 KB On mine the only vacuum line I have coming out of the port on the manifold on back side is the larger line coming out and connecting to the little plastic tree on the firewall. I am sure this goes to brake booster and a few other places, but I have removed my EGR and smog pump and allowed me to get rid of a lot of those lines. Hope pics help.

    Brant

  3. #3

    Default

    Thanks for the info.

  4. #4

    Default

    Hi Messe,

    Here is a link that helps identify components and what the connections are. The diagram for 85 is in there.

    http://vb.foureyedpride.com/showthre...vacuum+diagram

    The thermal switch with the rubber caps is to provide manifold vacuum when cold to the distributor. When warmed up, it will provide carburetor ported vacuum.
    W

    As always, "It ain't what you don't know that gets you, it's what you think you know that just ain't so."

  5. #5

    Default

    Ok. but i have only one port on my distributer and thats going to the carb. Where does the other hose go?

  6. #6

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    The vacuum switch with the electrical connector is there to provide manifold vacuum to the distributor when the engine is cold,
    and switch to ported vacuum once it's warm. This was done to improve drivability when the choke has opened, but the engine
    is not yet warmed up. Why anyone would disconnect that is a question for the ages...

    The electrical portion of that switch inhibits the "Upshift" light when the engine coolant temperature is below 128ºF (green top).

    That switch should have manifold vacuum connected to the top port, ported vacuum connected to the bottom port, and the
    center port goes to the distributor. Ported vacuum on the stock 4180C carburetor is the long thin nipple on the front of the
    carburetor base plate.
    Last edited by JACook; 09-13-2018 at 12:27 PM.
    Cheers,
    Jeff Cook

    '85 GT Hatch, 5-speed T-Top, Eibachs, Konis, & ARE 5-Spokes ... '85 GT Vert, CFI/AOD, all factory...
    '79 Fairmont StaWag, 5.0, 62K original miles ... '04 Azure Blue 40th Anny Mach 1, 37K original miles...
    2012 F150 S-Crew 4x4 5.0 "Blue Coyote"... 65 coupe, 289 auto, Pony interior ... '67 coupe 6-cyl 4-speed ...
    '68 Vert, Mexican block 307 4-speed... '71 Datsun 510 ...
    And a 1-of-328 Deep Blue Pearl 2003 Marauder 4.6 DOHC, J-Mod, 4.10s and Lidio tune

  7. #7

    Default

    on my 1850 I have one port on the left side of the metering block and 2 ports in the carb base facing forward.

  8. #8

    Default

    Using a Holley 1850, the distributor vacuum source is on the passenger side of the front metering block.
    The 1850 has no proper EGR vacuum source. All other vacuum connections are manifold vacuum.
    Cheers,
    Jeff Cook

    '85 GT Hatch, 5-speed T-Top, Eibachs, Konis, & ARE 5-Spokes ... '85 GT Vert, CFI/AOD, all factory...
    '79 Fairmont StaWag, 5.0, 62K original miles ... '04 Azure Blue 40th Anny Mach 1, 37K original miles...
    2012 F150 S-Crew 4x4 5.0 "Blue Coyote"... 65 coupe, 289 auto, Pony interior ... '67 coupe 6-cyl 4-speed ...
    '68 Vert, Mexican block 307 4-speed... '71 Datsun 510 ...
    And a 1-of-328 Deep Blue Pearl 2003 Marauder 4.6 DOHC, J-Mod, 4.10s and Lidio tune

  9. #9

    Default

    Got it. Thanks everyone

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