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what the heck is this thing?!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by jekbrown, Mar 14, 2005.

  1. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

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    yanking the heater/AC system out of my '85 and installing a mohave heater in its place (write-up coming soon!). When I pulled the stock junk out, I came upon this thing. I don't know much about 'em, but that looks like a FI computer to me. Not sure what else is could be, but it can't be that so what the heck is it? my rig didn't come with FI so... what the heck? lol! anyone know?

    [​IMG]

    j
     
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Where is it located? It could be the ECM for the electronic controlled distributor and electronic controlled carb.
     
  3. 1K_yd_Shooter

    1K_yd_Shooter Registered Member

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    If it was up under the dash behind the glove box it is the ECM.
    I just pulled mine out to put in an aftermarket heater also.
    Dennis
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    Thats an ESC controller. ECM's are larger.
     
  5. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

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    ok, what does it do? do i need it? lol!

    j
     
  6. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    It adjusts your timing , was useful to GM to keep the 305's from pinging on cheap gas with their 9.2:1 compression . If you do not have a computer controlled carb , get a regular HEI distributor and forget about it . I left mine in there , but the distributor is in a box in my garage :k5: :k5:
     
  7. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

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    yeah, back in the day I had my 305 removed and a crate 350 put in. One of the plugs (5 or 6 wires) that comes out of this thing has always been disconnected and just kind of hanging there behind the engine by the firewall. I have all the stuff to go TBI, including the tbi distributor. When I do the swap, I won't need this thing at all anymore, right?

    j
     
  8. bigcat44

    bigcat44 Registered Member

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    Don't mean to get off topic but if you guys are getting rid of your stock heating stuff I am in need of the stock stuff behind the dash that controls where the air flow goes. Give me a price because right now I can only direct airflow to defrost. I have the tubing and the actual vents I just need the large black box that distributes the air!!
     
  9. dyeager535

    dyeager535 1 ton status Premium Member

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    No you don't need it with TBI. But keep the "bracket" it sits in for your ECM.

    Knock sensor, timing, all handled via the TBI system as one, not standalone like ESC.
     

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