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  1. #1

    Default '96 Suburban 7.4L, Won't start, scanner won't read codes

    Need some help. My '96 K2500 Suburban died on my wife while driving home. It cranks, but won't start. Checked for secondary spark - none. Checked fuses, all good. Checked coil, checked good. Replaced crankshaft position sensor on a hunch, didn't work. Borrowed a scanner & plugged in and it won't recognize that it is plugged into the truck! Checked scanner on another car, it's working fine. Re-checked fuses, all good. Ideas?

  2. #2

    Default

    Did you check for fuel pressure at the same time?

    The usual reason a scanner won't recognize when it's plugged in is because there is no power from the vehicle to the diagnostic port. On GM's, they routed this power through, I believe, the cigarette lighter fuse, and usually it is determined that the fuse is bad. If you insist that the fuses are all good, then you need to determine if you have power to the diagnostic port, and, if not, find out why.
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
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  3. #3

    Default

    Yep, sounds like there's a break in the power going to certain points in the truck.

    Welcome to the forum btw!
    Scott

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  4. #4

    Default

    Quote Originally Posted by MrShorty View Post
    Did you check for fuel pressure at the same time?

    The usual reason a scanner won't recognize when it's plugged in is because there is no power from the vehicle to the diagnostic port. On GM's, they routed this power through, I believe, the cigarette lighter fuse, and usually it is determined that the fuse is bad. If you insist that the fuses are all good, then you need to determine if you have power to the diagnostic port, and, if not, find out why.
    agreed!

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    Ryan

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  5. #5

    Default

    Thanks for the help! Did find that the fuse to the cigarett lighter was bad, didn't check that one before. Now the scanner reads, no codes though. I didn't check the fuel pressure yet, started trying to track down why there was no secondary spark. Re-checked to be sure, and still no spark. Ideas?

  6. #6
    Jr. Mechanic
    Join Date
    Sep 2007
    Location
    Los Angeles, CA
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    116

    Default

    I'm trying to remember, did 96 still have a distributor? If they do, the ignition module and/ or pickup coil would be my prime suspect. Also, do check your fuel pressure, like shorty mentioned. And check all your fusible links. Other than that, I'd do a pin by pin on the ECM itself!
    '88 Jimmy 4X4
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  7. #7
    Master Mechanic
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    Default

    Quote Originally Posted by Toymyster View Post
    I'm trying to remember, did 96 still have a distributor? If they do, the ignition module and/ or pickup coil would be my prime suspect. Also, do check your fuel pressure, like shorty mentioned. And check all your fusible links. Other than that, I'd do a pin by pin on the ECM itself!
    Yes they have a Ign Module, inside the Distributer, sound as if it has quit working.........

    Jeff
    JMoney02

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