94 Disco 1 3.9 Running rough

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  • baetis99
    Low Range
    • May 2010
    • 2

    94 Disco 1 3.9 Running rough

    Please help, new to this forum and my Disco 1 recently started not starting as well, but when started it ides fine. As soon as step on the gas and put it in gear it has no power until I get above 3000 rpms and then it runs great. Plugs aren't fouling and wires are new. Oil and coolant look normal and I have no warning lights. Thanks in advance.
    1994 Discovery 3.9
    Vail, Colorado
  • joshua.mcguoirk
    1st Gear
    • Sep 2007
    • 122

    #2
    Vacuum Hoses

    From what you describe... It sounds to me like a vacuum leak.

    Confirm that all hoses are in good condition. Some forget to include the hoses for the cruise control.

    An old mechanics trick:

    1. Start vehicle.
    2. Open hood.
    3. Using the gas ONLY from a propane torch, run over all vacuum hoses.

    If idle increases... you found the bad hose.

    Otherwise, its something else... like the timing. Easily check with a "timing" light.

    Cheers,
    1990 RRC, 3.9L, AUTO "Willow Pond" (Sold)
    1996 D1, 4.0L, AUTO "Lucas"
    1999 RR, 4.0L, AUTO "Belle" (Sold)

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    • baetis99
      Low Range
      • May 2010
      • 2

      #3
      Thanks Joshua, I'll give the entire vacuum system a close look. Great tip on using propane to find the leak. If that doesn't work I'll pull out the timing light.
      1994 Discovery 3.9
      Vail, Colorado

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