mpfi

  1. B

    Cam and 411pcm swap

    I have a 97 k1500, l31 vortec motor, 4l60e, np243, 10 bolt 3.73 truck and I’m putting a used but less blown up motor in it here soon. Exact same motor but I’m looking to give this thing some more power and get that cam sound. I’m looking into a melling m-22280 cam right now and a set of .510...
  2. J

    97 Suburban K2500 7.4l Stutter

    Hi all! I’ve been chasing this stutter I’m having and have replaced just about everything on this thing haha. I purchased the truck and it had the dreaded intake manifold coolant leak so I replaced a ton of parts while I was there. Once the engine is warm wether in park or at a complete stop in...
  3. J

    97 Suburban K2500 7.4 MPFI Stutter

    Hi all! I’ve been chasing this stutter I’m having and have replaced just about everything on this thing haha. I purchased the truck and it had the dreaded intake manifold coolant leak so I replaced a ton of parts while I was there. Once the engine is warm wether in park or at a complete stop in...
  4. S

    Need help with Cam, Heads, and tune choices

    I Have a 4x4 1997 GMC Sierra k2500, with a 5.7l Vortec. It has 170k miles, and the 4l80E transmission, also. I am contemplating having my local shop do 4.56 gears from 3.55, but thats a conversation for another day. I will probably do a 2.5" true dual exhaust as well (outside the 5k budget)...
  5. D

    New MPFI Spider Injection caused Engine Seizing????

    Hey ya'll, I have a '98 K1500 with a 5.7 Vortec (vin code R). The truck has 230k on it, so i decided I would do the MPFI upgrade. I figured it had the original CFI in it. Well, I took it apart and discovered it already had an FJ504 (O'Reilly's) injector in it. Being as I had a brand new one...
  6. 96CK

    1996 GMC Z71 - 220k - Rough Idle/Hard Start - New to Me

    Well, I suppose this is as good a place to place an introduction as any. To start off with, it feels good to be back on a forum, I haven't been on one since I had an LS1 powered F-Body. Alright, so I just purchased this truck as a fixer to daily driver project. They just don't make them like...
  7. 2doortahoetoby

    Best choice for MPFI

    Long time viewer and reader of the threads here but I just want any possible new ideas or information on the topic. I know a lot of people recommend the mpfi conversion, and I have been needing to put a new spider in. I have been having a misfire code that won’t go away. I did my intake gaskets...
  8. pl813239

    Benefits of adjustable fuel pressure reg for mpfi?

    What would be the benefits of an adjustable fuel pressure regulator on a mpfi spider? More specifically while also having a cam, headers, and tuning capabilities. Appreciate your input.
  9. chris2323

    Increasing Fuel Pressure on Spider Injectors

    Does anyone have any experience increasing fuel pressure on the spider injectors? Its my understanding that there is a torx adjustment screw on the fuel pressure regulator. Some people have said they were able to increase pressure up to 70psi. Currently seeing over 100% injector duty cycle at...
  10. B

    No fuel pressure at the rails after mpfi conversion

    So i have 1999 k1500 4x4 with the 5.7l vortec. I have installed the following within the past year (alternator, fuel pump, fuel lines, fuel filter, distributor cap, plugs/wires, starter, ignition switch). I just did the mpfi conversion and now the truck won’t start, the truck ran and started...

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