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87 TBI vapor canister

Discussion in 'The Garage' started by btolenti, Oct 16, 2005.

  1. btolenti

    btolenti 1/2 ton status

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    For those with TBI, does your vapor canister connect directly to the TBI or is there an inline purge valve (vacuum or electronic)?

    Thanks!
     
  2. btolenti

    btolenti 1/2 ton status

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    Anyone? Someone's got to have an answer to this! :doah:
     
  3. clarkjw24

    clarkjw24 1/2 ton status GMOTM Winner

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    I don't have a canister on my rig with tbi :dunno:
     
  4. blazerguy 90

    blazerguy 90 1/2 ton status

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    yes, it connects directly to the TBI.
     
  5. btolenti

    btolenti 1/2 ton status

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    ....so is there a purge valve in between the tank and the canister then? :dunno:
     
  6. yunit

    yunit 1/2 ton status

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    Nope, goes from the front of the throttle body directly to the canister.
     
  7. btolenti

    btolenti 1/2 ton status

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    yes, but what about the other line from the canister to the fuel tank?
     
  8. dyeager535

    dyeager535 1 ton status Premium Member

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    You might want to go look at the '85 or '86 TPI wiring diagrams over at thirdgen.org just to confirm, (that it's listed as EVAP purge) but on the wiring manual I linked to in your other thread, I see no cannister purge pin on the ECM. I may have missed it, as that seems odd, but who knows.

    I know my '88 TPI has a cannister purge connector.
     
  9. btolenti

    btolenti 1/2 ton status

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    Yeah, I was thinking the same thing (that the ECM doesn't have a pin out for it). But I also found these vacuum purge valves too, and am wondering if they are on any TBI setups....

    cp113.jpg
     
  10. loafer

    loafer 1/2 ton status

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    No purge valve on any of the TBI trucks I have owned; The vacuum line goes directly from the canister to a ported vacuum port on the throttle body. Using ported vacuum is how they got around the purge valve.

    Fuel vent line goes directly from the tank to the canister. No valves or anything to my knowledge.
     
  11. btolenti

    btolenti 1/2 ton status

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    Phew! That's a relief. Thanks for the help. :waytogo:
     

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