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Truck running terrible. Need help...

Discussion in 'Mechanic and Repair' started by tsh1773, Jul 2, 2007.

  1. tsh1773

    tsh1773 LawnSite Senior Member
    Messages: 319

    I have a 1997 Mercury Mountaineer with 5.0 V8 engine. I noticed lately it's been hard to start and now it's skipping really bad until it warms up. I started listening to the engine yesterday and noticed a hissing sound such as a vaccuum leak. In the first picture, there is a metal fitting where it looks like a hose belongs but I do not a loose hose anywhere nor do I see where the other end of the hose would connect to. When I put my finger over the hole it'has a vaccuum on it and it will shut the engine down if my finger is kept over the hole This area is just under the right side of the intake manifold area (2nd pic). If you have an engine the same size and approximate year, please advise me what's causing this. Thanks in advance.


  2. tsh1773

    tsh1773 LawnSite Senior Member
    Messages: 319

    Bump Bump Bump
  3. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    Sorry, Not much help on this one. I got out of the auto biz 16yrs. ago, I hope you don't mind but I posted this thread in a auto forum I'm a member of. I will let you know should I find anything out.
  4. tsh1773

    tsh1773 LawnSite Senior Member
    Messages: 319

    I don't mind at all. Thanks.
  5. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    I don't know if you got it fixed yet but this just came in today;

  6. Bill M

    Bill M LawnSite Member
    Messages: 36

    Check for a loose hose, if you can't one, cap it off. Check if the pcv on the rear of the lower intake is plugged in.

    Vacuum sources to check
    - pcv
    - brake booster
    - carbon cannister
    - fuel pressure regulator
    - vacuum tree on fire wall
    - EGR

    take a good look around, even under the front of the upper intake for a hose that is open. Don't be afraid to pull on the hoses slightly.

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