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Set Timing '89 Chevy K2500 350 CID

Discussion in 'Truck & Equipment Repair' started by Daddy Wags, Sep 5, 2007.

  1. Daddy Wags

    Daddy Wags Member
    Messages: 62

    Does anyone know which wire to disconnect before setting the timing on this truck? I think it's on the pass. side firewall behind the plastic cover, but not sure which one. I've been told it's a single wire.
  2. sweetk30

    sweetk30 PlowSite.com Addict
    Messages: 1,588

    you are correct. its a 1 wire only gm weather pack style plug.

    disc wire fire up truck. check engine light will be on. set to 0* and turn off truck. plug back in and fire up. should be all good. some times you need to disc batt to clear timming fault code.
  3. Daddy Wags

    Daddy Wags Member
    Messages: 62

    Is this wire on the pass. firewall? Which plug is it?
  4. #1 plowtech

    #1 plowtech Senior Member
    Messages: 253

    It is 1 single wire ,weather pac style plug, behind your plastic cover on pass side firewall.
    remove the cover w/ 1 plastic cheesy nut,and its behind it.

    Goodluck, Plowtech.:)
  5. Daddy Wags

    Daddy Wags Member
    Messages: 62

    Do you know what color the wire is?
  6. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    The wire you want is a single light brown wire with a black stripe. It's located under the plastic cover on the pass side of the firewall like you said. After you set the timing with the truck running the ECM will set a code because of having the timing wire disconnected so be sure and clear the code after your done.
  7. Daddy Wags

    Daddy Wags Member
    Messages: 62

    Found it. Thanks.
  8. Buick1500Chevy

    Buick1500Chevy Junior Member
    from Buffalo
    Messages: 1

    If you advance the timing to 6 BTDC it will run a bit stronger...
  9. Daddy Wags

    Daddy Wags Member
    Messages: 62

    Found it. Thanks.