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  1. #1

    Default 1994 Chevy K1500 5.7 Starting Issue

    Hey guys,

    New to the board but have read it several times over the past month. I have a 1994 K1500 5.7 work truck with 215,000 miles. I only drive it roughly 20 miles round trip to run my side lawn business so I would like to keep it solely for that. I have time to try to fix it myself and this has me stumped. I am by no means a mechanic but I want to try to fix it before I do anything else. Here is the deal:

    The truck starts up fine every single morning or afternoon on the first try. I would say it starts 99% of the time; even after driving it and stopping for a while. However, over the past two months, I have gone to a job, reached operating temperature, let it sit for 30 minutes to an hour, and try to start it and it would just crank and not start. It has done this 3 times now. Each time, if I leave the truck overnight, it starts right back up like a new truck the next morning.

    I have tried to self diagnose this as best as possible. Here is what I do know:

    It is getting fuel to the TBI and the injectors are spraying fuel.

    I am getting spark to the 1 and 3 spark plugs.

    I previously thought it was a ignition issue and not getting any spark. I replaced the ignition coil and it still has the problem.

    There are no error codes when its in this condition. I also thought it was a "heat issue" but yesterday, after driving it roughly 1/10 of a mile, it did it again. Like before, it cranked right up this morning. Could it be a compression issue? The truck runs great. Only other symptom would be a "looping idle" where it idles "down" or "skips" at a stop light. It has never died while at a stop light though. Could these symptoms be related? Would the idle problem be air flow related?

    I replaced the fuel pump, fuel pump relay, and fuel filter all within the last 3 months. Any help you can provide will be greatly appreciated.

  2. #2

    Default

    Welcome to GMTC! The idling down or skipping at a stop light could be an IAC 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, http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  3. #3

    Default

    Quote Originally Posted by Pikey View Post
    Welcome to GMTC! The idling down or skipping at a stop light could be an IAC issue.
    Thanks. Could a bad Idle Air control valve contribute to my no start condition?

  4. #4

    Default

    Update:

    Happened again yesterday. Luckily it was in my driveway. Decided to try to unplug the ECM when it was in this condition and see what happens. Unplugged the two connectors for a minute or two, plugged them back in, and the truck started. Started fine several times immediately after. I'm guessing a bad ECM or a wire/sensor is sending an error message?

  5. #5

    Default

    It definitely can be a bad IAC. My 1994 Suburban was almost impossible to start without putting my foot in it, and it would sputter around at about 500 rpm, blowing black smoke, all sorts of nasty stuff. Turned out the IAC was bad.
    ...
    ....

  6. #6

    Default

    So, can you actually see fuel spraying when truck is turning and not starting?

  7. #7

    Default

    Quote Originally Posted by SpeedoJosh View Post
    So, can you actually see fuel spraying when truck is turning and not starting?
    Yes. Someone else has to be trying to start it though.

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