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  1. J

    2000 gmt400 3500hd 7.4 vortex low power

    I am at loss at where I should go from this point without throwing parts at truck.
  2. J

    2000 gmt400 3500hd 7.4 vortex low power

    Cats are gutted already. As far as the o2 sensors not sure swapping them out absolutely says they are fine with problem staying on bank 1. If I understand what I've read there can be another issue that could effect the o2 voltage. If someone could confirm that for me thanks
  3. J

    2000 gmt400 3500hd 7.4 vortex low power

    So I didn't get to spend as much time with truck as I hoped but. I have got some new interesting info. Borrowed a different scan tool with more functionality. Bank one sensor one o2 sensors is not switching. Staying around .140 v if I remember rt. I will double check and edit if needed...
  4. J

    2000 gmt400 3500hd 7.4 vortex low power

    No hot start. It always starts up easily. I'm fairly certain the rear talk is empty. I totally agree that the new FPR seemingly is too low. 48 lbs is what it's running at idle witch is what my 5.3 LS engine runs. It came from AutoZone, the numbers on the box is at least correct but they could...
  5. J

    2000 gmt400 3500hd 7.4 vortex low power

    The injectors are under the plenum . With the top half of the plentum off Energizing/pressurizing system you can see if the injectors are leaking or not. They did not appear to be .
  6. J

    2000 gmt400 3500hd 7.4 vortex low power

    I'm gonna have some time to work on the truck this weekend so I'm updating what I've done. I thought the $15 cheap aftermarket FPR could have been bad out of the box so I had intended to buy a Delphi but no one had them in stock so I got a GP Sorenson for $85 that I feel confident with...
  7. J

    2000 gmt400 3500hd 7.4 vortex low power

    Ok so here's what I've learned the reason I had such a hard time installing the FPR to begin with is the new aftermarket fpr had a different shaped plastic spacer that didn't allow me to get fpr deep enough to let the ring clamp seat properly so when I pinch off return in blew out. Took back...
  8. J

    2000 gmt400 3500hd 7.4 vortex low power

    Fuel Trims are the same defaulting on bank 1 . Cats have been hulled out .
  9. J

    2000 gmt400 3500hd 7.4 vortex low power

    Thank you for your reply. I started to replace injectors while I had it apart I just need the truck crossed my fingers FPR was the issue.
  10. J

    2000 gmt400 3500hd 7.4 vortex low power

    Thanks for replies. I did not get an alert for your replies I will figure that out so I can keep up with thread. Fuel trims are relatively the same with bank 1 defaulting once circuit closes. My scanner will not do a injector balance test. No codes present or before.
  11. J

    2000 gmt400 3500hd 7.4 vortex low power

    Hi folks I'm new here and this is my first post. This should be the right place for questions for this truck. Truck has 90k miles with a 12' flat bed. Fuel pump had been replaced before it was parked a couple years back. When got it up and running had low power, wouldn't hardly pull itself...

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