What The Heck?

Discussion in 'Intermediate CJ-5 and CJ-6 Tech' started by Chuck Tom, Nov 21, 2017.

  1. Nov 21, 2017
    Chuck Tom

    Chuck Tom New Member

    Arizona
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    Hey guys I was cleaning up the transmission and I saw a couple items I did not recognize. I went pouring over the TSM and had no luck finding out and information. Thanks for any help I greatly appreciate it!

    IMG_09863.jpg
     
  2. Nov 21, 2017
    Zoomer

    Zoomer eJeeper (walking) Sponsor

    Minnesota
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    Look like switches to me, maybe neutral safety switch and backup (reverse) switch?
     
  3. Nov 21, 2017
    Chuck Tom

    Chuck Tom New Member

    Arizona
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    Ah great. I haven't checked the wiring diagram yet on the TSM going to give it a look over. Thanks for your thoughts!
     
  4. Nov 21, 2017
    PeteL

    PeteL Member Sponsor

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    At least one of those is the switch for the back-up light.

    "Safety Switch?" We don't need no steekin' safety!
     
  5. Nov 21, 2017
    Chuck Tom

    Chuck Tom New Member

    Arizona
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    Yes the one with 2 prongs is the back up switch. The other says on the wiring diagram just "transmission controlled" both end up at the ignition at the instrument panel.
     
  6. Nov 21, 2017
    jpflat2a

    jpflat2a what's that noise?

    Riverside CA
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    other = "transmission controlled spark switch"
     
  7. Nov 21, 2017
    Hellion

    Hellion Exciting New Member

    Eastern TN
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    Forgive my ignorance, but can you elaborate on what that is? (y)
     
  8. Nov 22, 2017
    timgr

    timgr Jeepin' Nerd Sponsor

    Medford Mass USA
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    TCS is an emissions device. Controls a vacuum solenoid that retards the spark in top gear. Covered thoroughly in the TSM.
     
  9. Nov 22, 2017
    DrDanteIII

    DrDanteIII All work and no jeep makes jack a dull boy Sponsor

    Milford NJ 08848
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    It sends a signal that the trans is in top gear so that the timing can be retarded and the mixture can be leaned out to conserve fuel.
     
  10. Nov 22, 2017
    timgr

    timgr Jeepin' Nerd Sponsor

    Medford Mass USA
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    Close. Does retard the spark by blocking the vacuum advance, but has no effect on the mixture or economy. Indeed, I would assume less advance makes fuel economy slightly worse. Later spark reduces the combustion chamber temperature and reduces NOx.

    Page 4A-27 http://oljeep.com/gw/74_tsm/4A-EmissionControl.pdf

    EGR affects the mixture, but that's always on at operating temperature and above idle, at least in 1974.
     
  11. Nov 22, 2017
    Chuck Tom

    Chuck Tom New Member

    Arizona
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    Yeah haha I would have never check emissions section of the manual. Thanks Tim
     

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