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Thread: Hey, no start

  1. #1

    Default Hey, no start

    Helped a friend with a motor swap, bought it with a blown motor. We've got it cranking and assuming fuel, but not getting spark. Pulled off the icm plug, got 12v from the left (red) wire, white is next (should pulse when cranked over correct? But its not) Then black (ground) and cant remember the forth. Any ideas of troubleshooting or a good write up?

  2. #2
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    Name
    Cameron
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    1994 Formula
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    Default

    White wire should pulse 1-4 VAC when cranking, If i remember right that's the signal wire from the opti. There should be 2 12v wires for the Coil, ground and white signal.

    Opti Test is alil more than halfway down
    http://shbox.com/1/4th_gen_tech2.html
    2012 Sierra - 5.3, Summit "Stage 1" Truck Cam
    1994 Jimmy - LS? LT? 4wd? AWD? Time? Money?
    1994 Formula - 5.3, Terminator X, Billet VS7875, "Best Cam", T56, QP 9"
    Formula Build Thread


  3. #3

    Default

    Ok, im on course. Id think its not the opti because its brand new. But prob worth a test

  4. #4
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    Cameron
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    Default

    Did you use a new opti harness too?
    2012 Sierra - 5.3, Summit "Stage 1" Truck Cam
    1994 Jimmy - LS? LT? 4wd? AWD? Time? Money?
    1994 Formula - 5.3, Terminator X, Billet VS7875, "Best Cam", T56, QP 9"
    Formula Build Thread


  5. #5

    Default

    Yup. Brand new, came with the opti.

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