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  1. #1

    Default Truck won't start after a few upgrades.

    Ok 1st a little history of what the truck has: 1990 GMC C1500 5.7L, MSD HEI Distributor, Hypertech Performance Chip.
    Now what I just finished adding is: Shorty Headers, Water Pump, Thermostat, Radiator, all new cooling\heater hoses, O2 sensor, spark plugs and wires, Edelbrock Valve Covers and Air Cleaner.

    Truck was running 100% before I installed all the new stuff and now it tries to start but it won't.
    You crank on it for a bit and it just blub-blub-blub, dies.

    I didn't mess with the distributor besides unplugging the wires, I've confirmed I'm getting fuel and spark.
    The tricky part is that the previous owner marked the dist. with a sharpie for the cylinder #'s but it doesn't match the firing order so it can't be right.

    I went ahead and wired the dist. to this layout:

    My brother is coming by with a timing light so we can check that to confirm and we'll also determine for sure which post on the dist. is #1.

    Any ideas regarding this problem please let me know. I was so careful not to mess with anything electrical related but regardless it won't start.

  2. #2
    Jr. Mechanic
    Join Date
    Mar 2013


    did you put plug wires back on the same way ?

  3. #3


    I would bet that your plug wires are not correct. If it ran the way he had it then even though he may have not had the numbers correct, it still ran. Your "correction" of the wires may be the issue.

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors,
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

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