• Tags

hp efi

  1. Digital Tuning 1991-exhaust crackles

    Hello all, I have a 1991 347 stroker lx 5.0 with the HP EFI system. I have an off-road X-pipe with shorty headers, full tail pipes, and mufflers. I would like to know how to do exhaust pops and crackles, such as when I let off the throttle after acceleration. I have not had any success with...
    • paddyrk
    • Thread
    • Oct 9, 2018
    • 347 347stroker bang crackle exhaust hp efi lx pop stroker
    • Replies: 8
    • Forum: Fox 5.0 Mustang Tech
  2. Electrical 1991 LX 5.0, radio wiring help, ECU swap

    Hi, I am new to the forum and recently did a 347 swap into my '91 fox, and when doing so, I replaced the ECU with a Holley Hp EFI system. I have the car running and driving, but the radio does not turn on. I believe the radio got its power from the old ECU through its system of big red wires...
    • paddyrk
    • Thread
    • Jun 7, 2018
    • body diagram ecu electrical fox holley hp efi radio swap wiring
    • Replies: 2
    • Forum: Fox 5.0 Mustang Tech
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