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ECM in my 84?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BillyBob, Apr 3, 2001.

  1. BillyBob

    BillyBob 1/2 ton status

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    I saw a box that looks kind of like an ECM inback of the glove box of my 84.. unlike the 87, it only has 1 set of wires connected to it, not two. What is this for? Is it for the 700 tranny? is it something for the carb?

    <A target="_blank" HREF=http://billybob.coloradok5.com>http://billybob.coloradok5.com</A>
    If it ain't leaking oil, it ain't my truck![​IMG]
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    They got a little complicated if your truck has ESC (electronic spark control) Sounds like thats what you found, but not sure. On my '83, the 700 controller was just over the gas pedal, nothing on the passenger side. You'd need to see where the wires go through the firewall, and trace them from there.


    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  3. Cavalry

    Cavalry 1/2 ton status

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    The only "magic box" I have seen in back of my glovebox controls the choke and the AC idle control, has maybe 6 or so wires going to it

    Luke
    84 K5
    [​IMG]
     
  4. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Think D got it right. Sounds like the ESC module. Under the hood you will see a set of wires passing through a gromit between the AC box and the Distributor. Most run to the distributor and you may also have a blue(think that's right) wire that runs down to the side of the block to a knock sensor.

    Diging it in the dirt with my K5's
    Grim-Reaper
    <A target="_blank" HREF=http://grimsk5s.coloradok5.com/>http://grimsk5s.coloradok5.com/</A>
     
  5. BillyBob

    BillyBob 1/2 ton status

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    Dang Tech-ma-nology! Anyway, what does this ESC box thing do?

    <A target="_blank" HREF=http://billybob.coloradok5.com>http://billybob.coloradok5.com</A>
    If it ain't leaking oil, it ain't my truck![​IMG]
     
  6. Jaden

    Jaden Registered Member

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    Same thing on my 83

    I have gone to a normal HEI distributor and a non controlled carb and was wondering if I will have any emission probs.......
     
  7. dyeager535

    dyeager535 1 ton status Premium Member

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    Re: Same thing on my 83

    Your carb wasn't "controlled" in the first place, except MAYBE if it was originally a CA truck. As long as you hooked up all the hoses, you won't have any problems. FWIW, without a visual inspection, my high mileage 305 passed emissions without AIR or the Cat converter.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  8. dyeager535

    dyeager535 1 ton status Premium Member

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    I believe ESC was/is a knock sensor combined with the module in the distributor..when knock is detected, it retards the timing to prevent engine damage. In other words, like most emissions equipment, it is to keep people that are too lazy/cheap to keep their vehicle in proper running order from damaging it or the environment.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     

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