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Thread: Vacumm troubles

  1. #1

    Default Vacumm troubles

    I'm one of those guys and can't follow the vacumm diagrahm. So where does this hard tube go and while I'm at it what does this thing doName:  20170715_134345.jpg
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  2. #2

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    It's an 84 Mustang GT factory correct 5.0Name:  20170712_141437.jpg
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  3. #3
    FEP Super Member xctasy's Avatar
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    Its okay, The schematic aint always so easy, because the names of the parts evolved from the 1979 list.


    They are noramlly color coded Pink or Blue or Orange, but can look Purple or Brown with age (or I might just be a closet color blind guy...)

    Part number 12A 182 makes it one of the VCS Vacuum Controlled Switches (actualy SOL V Solenoid Valve operation switches).

    The Best swap-over was Red 78''s original 1979 list

    http://myzephyrs.com/vac_part_name.htm

    Vacuum Controlled Switch (Generic)
    Vacuum Controlled Switch (Cold Temp) = VCS-CT
    Vacuum Controlled Switch (Decel Idle) = VCS-DI


    Manual 4-bbl 5.0 83, 84 and 85's differ, so these two 85 diagrams will only be a little help.

    I think 1984 5 speeds had four

    Its the multiple terms for the same thing....

    I've found this the nicest quick list care of qikgts

    Quote Originally Posted by qikgts View Post
    Don't know if this will be any help but figured I might as well post it again. This is the underhood diagram from my '85 with high altitude compensation equipment.


    Its a Solenoid operation device, what it operates is labelled somewhere else with a letter on the schematic.

    Problem here is that there are incorrect terms on the VECI diagram compared to the 1979 list. Sometimes, the line diagrams have your eye balls on hellz-apopin' stalks after a few minutes.



    SOL V DIV is the TAD vent Solenoid, Diverter
    SOL V DUMP is the TAB vent Solenoid, Bypass

    On other engines, it has a different colors, and sometimes, a different purpose.

    Now, AIR: This is a Secondary air injection Ford calls the Thermactor, short for Thermal Reactor. CA vehicles are installed with it as standard. Air Injection Reaction is what it stands for.

    The thermactor system consists mainly of the air pump, the air pump diverter and bypass valves, TAB and TAD solenoids (if equipped) and the catalytic converter.

    AIR BPV: Air Bypass Valve (aka Thermactor Air Bypass TAB)

    My A/C throttle kicker Solenoid on my 81 3.3





    The diagram

    Click this link to make it bigger

    http://vb.foureyedpride.com/attachme...hmentid=110589



    http://vb.foureyedpride.com/showthre...ns-83-vs-84-85

    Quote Originally Posted by jessesandy View Post
    Thanks. Although my components are operating in reverse to achieve the same operation.
    My '83 is an early build (Oct. '82). (if that might explain the differences ?)

    Anyway, my vacuum switch is definitely closed (13.2 ohms) at atmosphere (from 0 to 8 inches)
    and the goes to open circuit with 8 inches or more.




    Also, my TAB and TAD solenoids "pass through" vacuum when they are not energized.
    When energized the solenoids block the source vacuum and vent the "device" to atmosphere.

    The end result is operation just as you described.

    What is the reason to send thermactor air upstream during heavy load ?

    Thanks
    Todd H.


    http://vb.foureyedpride.com/showthre...ght=WOT+switch


    Shift light

    http://vb.foureyedpride.com/showthre...-light-in-dash


    Vacuum Line Acronyms & Color Codes;

    Color Codes to do Vacuum Diagram

    Red = Main vacuum
    Green = EGR function
    Orange = Heat control Valve (exhaust & intake) (AKA heat riser but more complex)
    YellowYellow = Distributor advance
    White = EGR vacuum (source)
    Black = Mainly used for the Evaporative emissions control
    Black = Thermactor ACV or Diverter valve
    Blue = Throttle Kicker control
    Pink = Thermactor Air Bypass Valve (BPV)

    Red = Main vacuum;
    Green = EGR function;
    Orange = Heat control Valve (exhaust & intake) (AKA heat riser but more complex);
    Yellow = Distributor advance;
    White = EGR vacuum (source);
    Black = Mainly used for the Evaporative emissions control
    Black = Thermactor ACV or Diverter valve
    Blue = Throttle Kicker control;
    Pink =
    In detail

    Thermactor Air Bypass Valve
    (TAB or (BPV) /AIR Bypass (AIRB) valve
    ACV (Air Control Valve) is the TAD (Thermactor Air Diverter) Valve

    (AIR Bypass (AIRB) and AIR Diverter (AIRD) valve combinations)

    MAN VAC is Manifold Vacuum
    FPR is Fuel Pressure Regulator
    EGR is Exhaust Gas Re-circulation Valve
    SOL V: Thermactor Air Diverter (TAD) Solenoid (SOL V) (AIRD) & Thermactor Air Bypass (TAB) Solenoid EVR is EGR Vacuum Regulator VRESER is the Vacuum Reservoir Can (Tank);
    V REST on later years is Vapor Valve (Roll-Over)
    V REST on earlier years is a Vacuum Restictor/delay valve, it delays vacuum for a certain amount of time
    Carbon Can is Carbon Canister (Charcoal Canister, Vapor Canister, Evaporative Emission (EVAP) Canister)
    MAP is Manifold Absolute Pressure Sensor
    AIR BPV is the AIR Bypass (AIRB) Valve; also called the TAB (Thermactor Air Bypass) Valve
    CPRV is Canister Purge Solenoid Valve/ Canister Purge Solenoid (CANP)
    VCKV is Vacuum Check Valve
    CAT is catalytic converter
    ENG is engine
    PCV is Positive Crankcase Ventilation Valve

  4. #4
    FEP Super Member xctasy's Avatar
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    Try this....it doesn't have the colors, but its 5 spped 5.0 4V GT 1984!


    Isolate what VSC you have, and check the lines to match.

    Quote Originally Posted by fiveliter8 View Post
    There are 13 possible configurations for the '84 MY. Do you know if your car is california emmissions? This diagram is Revision 15 (carb, non-california), and may have more functions than what yours was.


    You might have various other lines to the Upshift indicator switch.

    These are 1985 5 speeds, and might be different to your 84, but this WILL give you a great head start.

    Quote Originally Posted by JACook View Post
    One more comment-

    The cream-colored vacuum line that comes off the carburetor, above and ahead of the
    choke assembly, is EGR vacuum. EGR vacuum is used for several things, but the shift light
    is not one of them.

    This photo shows the two vacuum switches in the upper right corner. It also shows the
    switch contacts on the thermal vacuum switch that controls the distributor vacuum.

    Quote Originally Posted by 85GTTops View Post
    I'm not sure I follow. The line in the second photo is the cream one below the black and orange vaccuum line. That's the same exact line as the one that goes directly into the carburetor. You can see the elbow which is adjacent to the LCV.

    It matches this diagram for the 85 below:


  5. #5

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    I think the hard tube is the hood release cable

  6. #6

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    This is a CA car and it's not the hood release it's definitely a hard vacuum tube that broke when I tore down the top of the motorName:  20170516_172237.jpg
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    Last edited by gunnylama; 07-19-2017 at 08:07 PM.

  7. #7
    FEP Super Member xctasy's Avatar
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    Your under hood



    your VECI


    You have one hard line to the one only VCS

    The other line is to the Heat VLV



    Follow my Orange line with your Orange VECI line




    It goes to the LCV (Load Control Valve)



  8. #8

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    Nice job thanks

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