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Disconnecting ESC

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Chaz316, Jan 7, 2002.

  1. Chaz316

    Chaz316 1/2 ton status

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    I have an 82 with ESC. Its a 305. A previous owner removed the Stock manifold and the quadrajet with a Weiand High Rise intake and a Holley Four Barrel. It stutters a lot and has poor performance. Yea I know its a 305. It feels like the plugs are not all firing. I put it in park and rev it a couple of times and no hesitation or stuttering.

    I have read that the ESC module, if it doesnt get the required 8 to 10 volts from the ecm(?), it thinks that there is spark knock and retards the timing. Any idea?

    "If it aint broke don't fix it" is like a 4 letter word.
    <a target="_blank" href=http://www.phatboy.alloffroad.com>PhatBoy.AllOffRoad.com </a>
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    I don't have any GM service manuals here, but if you want to get rid of ESC (not sure if I would or not, '82 motor doesn't use it for anything but timing retard) I would investigate putting non ESC distributor parts in it. Maybe someone else has had one of these distributors apart, but I'd think a module swap to non ESC could perhaps get rid of it. Just have to find out if the actual mechanical parts inside changed.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
    Why insist on counting when the ring gear has the tooth counts stamped in?
     
  3. Chaz316

    Chaz316 1/2 ton status

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    The only reason I want to get rid of it is because it is retarding the timing when it doesnt need to because its not receiving the signal. Maybe I could run a wire from the battery and filter it down to 8-10 volts and see if I can trick it into believing there is no spark knock.

    "If it aint broke don't fix it" is like a 4 letter word.
    <a target="_blank" href=http://www.phatboy.alloffroad.com>PhatBoy.AllOffRoad.com </a>
     
  4. txbartman

    txbartman 1/2 ton status

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    If you have an 82, you shouldn't have an ECM. I don't think they put ECMs on our rigs until 87 when the TBI required it. However, if you have ESC, you will have a control box under your dash above/behind the glove box. However, this is NOT an ECM.

    On my crate, I plan to simply go with a Summit non-ESC HEI distributor. I'm not sure, but you may even be able to simply disconnect the ESC from the HEI. I am not sure if that would hurt anything (like if it is expecting some signal all the time just to operate normal), but that may be a consideration.

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     
  5. Chaz316

    Chaz316 1/2 ton status

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    The way I read it was the "little box" was expecting the signal from the little plug that goes into the engine and that it tells the little black box if there is or isnt spark knock. The little black box sends the signal to the distributor to retard the advance or not. If I sever the cable going to the distributor then the advance shouldnt change?

    The reason I am doing this is to try and save some money and not have to buy a non-esc distributor. A previous owner removed the Q-Jet and stock manifold were swapped for a Holley and a Weiand Hi-Rise intake. So the module that is in the motor may not even be there anymore.

    "If it aint broke don't fix it" is like a 4 letter word.
    &lt;a target="_blank" href=http://www.phatboy.alloffroad.com&gt;PhatBoy.AllOffRoad.com &lt;/a&gt;

    <P ID="edit"><FONT class="small">Edited by Chaz316 on 01/08/02 12:30 PM.</FONT></P>
     
  6. 85Blazer

    85Blazer Registered Member

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    I have a document which explanes how to remove the ESC and how to convert your distributor. I did this conversion after I installed my new engine and it works fine. I'll send it to you.
    Alan

    [​IMG] =
     
  7. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I just installed an older HEI and left the ESC unplugged...solved a lot of driveabilty issues I was having.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
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  8. blazer72

    blazer72 1/2 ton status

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    If you simply remove the box or just cut the wire then you will have no spark! the only way to do with out it is to remove it. TO tell if this is really an ECM dis look and see if it has a vacum advance if it does its not an ECM conyroled DIS

    72 Blazer 400TPI NV4500 NP203/205, 6 bolt FF14
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