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Thread: Popping INJ fuses on Beretta LS swap. Both banks acting identical.

  1. #1
    Fuel Injected! woody80z28's Avatar
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    Popping INJ fuses on Beretta LS swap. Both banks acting identical.

    Been a while...been so busy I only pop in when I need help. :(

    I have a 4.8 I'm putting in a Beretta (with a 5spd and Ford 8.8 to make it RWD). haha
    https://www.youtube.com/watch?v=2JnU-ZbfYH4

    I got the 2000 4.8 out of a running truck with the whole harness and fuse block intact. I wired it to test run on my stand after swapping on car intake and pan. Everything is set up just like LT1swap.com says. Power out and back from key (rocker) switch and a momentary starter switch and the PCM pink from the C100 connector run to switched 12v.

    With everything plugged in it pops both INJ A and INJ B fuses immediately with the key on.
    Unplug all the injectors and coils and it doesn't blow.
    Plug all the injectors in: fine
    Plug in the coil harnesses (without individual coils plugged in): fine
    Plug in any single coil on either side: fine
    Plug in 2 coils on either bank: blown fuse

    Any ideas? This one has me stumped.

    BTW, I'm getting about 1200ohms from the circuit at the fuse location to ground. Same test on my 2001 truck in the driveway with 8.1 is 1600ohms. Is that a clue?

    Thank you in advance.

    80 Camaro Z28 - 550hp AFR 383 / T56 6spd (Holley HP EFI)
    91 Beretta "SS" - 260hp 3400 MPFI / HM282 5spd (7730/$A1) sold! for crazy money...but I miss it
    94 Silverado Z71 - 300hp Vortec 357 TBI / NV4500 5spd (7427/$0D) gone but not forgotten
    96 Beretta "LS" - 4.8 LS RWD swap / 5spd (0411/2156)
    01 Silverado 2500HD - stock Vortec 8.1 / ZF6 6spd (0411/8322)
    https://www.youtube.com/c/GEARHEADdezign

  2. #2
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    That's a strange one. Is there a possibility you have a wire making contact with ground when all the coils are connected?

  3. #3
    Fuel Injected! brian617's Avatar
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    Strange indeed, However a blow fuse is a short. Don't over think it, find the short.
    89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
    95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
    05 Outback XT 2.5L turbo gas auto

  4. #4
    Fuel Injected! woody80z28's Avatar
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    I'm an idiot. Keep it simple stupid. I'll share my stupidity in case anyone else finds this in a search...

    Flashed the factory truck tune back to the PCM to make sure there wasn't something off with my modified one. Then, as I hooked everything back up (PCM and fuse block stacked on top of the battery) I noticed I had the damn terminals backwards! FYI: red goes to B+ and black to B- haha
    80 Camaro Z28 - 550hp AFR 383 / T56 6spd (Holley HP EFI)
    91 Beretta "SS" - 260hp 3400 MPFI / HM282 5spd (7730/$A1) sold! for crazy money...but I miss it
    94 Silverado Z71 - 300hp Vortec 357 TBI / NV4500 5spd (7427/$0D) gone but not forgotten
    96 Beretta "LS" - 4.8 LS RWD swap / 5spd (0411/2156)
    01 Silverado 2500HD - stock Vortec 8.1 / ZF6 6spd (0411/8322)
    https://www.youtube.com/c/GEARHEADdezign

  5. #5
    Fuel Injected!
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    Lol, it happens. My new ecm/pcm programming station has built in protection just for that and many more protection circuits. As much as we all know, we get in a hurry sometimes the closer we are to the finish :)
    -Carl

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    Its a fine line between clever and stupid and I cross that line way too often. Sounds like you did too but I bet it'll never happen again this way.

    Rick
    1970 Chevy El Camino, LM7 Engine, 4L60E - Two 896 and two 0411 PCM's

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