hp efi

  1. paddyrk

    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...
  2. paddyrk

    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...