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Thread: kishy's 1983 Grand Marquis 2dr

  1. #101
    Wagon Addicted Tiggie's Avatar
    Join Date
    Mar 2006
    Bedford, VA


    Quote Originally Posted by kishy View Post
    Are the boosters the inward-facing holes around the perimeter of the inner venturi assembly? Sorry for terminology issues. If that is them, yes, they are dribbling fuel.
    That's them. Drop the float level a little and that should help. Also be very sure the little holes in the top of the boosters are open. They are air bleeds, and if they are blocked you get a similar result. The extra fuel from the leaking boosters is contributing to the lack of idle control.
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  2. #102
    Stow It! GM_Guy's Avatar
    Join Date
    Sep 2008
    Ontario, Canada


    Quote Originally Posted by kishy View Post
    -idle mixture screws, and the same problem I had with the Ranger: why do they not seem to do anything? Threaded them in to seat and it kept running exactly the same. Idle must be set too high, but there's no lower it could be and still run.
    Did you poke a wire into the holes and blow 'em out with air when you had it disassembled?
    The other thing about little apparent change is its an emmisions era carb, ford probably did the same thing gm did, the idle mixture passages are smaller in an emmisions q-jet so you don't get the same range of adjustment as you would with a pre smog era carb.

    I do get the impression the bowl is too full. Need to recheck float height since parts-swapping. It's also at what I'd call the extreme of its adjustment so some creative re-bending will have to happen.
    Then drop it lower. Won't hurt to try, just the nuisance of having to take the air horn off again. No float height spec in the repair kit leaflet? As you drop it, pay attention to the car going lean when you are full throttling it (running the bowl dry).

  3. #103
    I'm an air-conditioned gypsy gadget73's Avatar
    Join Date
    Jan 2005


    fuel level in the bowl is somewhat dependant on pressure, so if that pump is overly enthusiastic it may be right "by the book" but in practice the fuel level ends up too high. The static height really isn't whats important, its the fuel level that matters, but most things don't allow you to check that so it just has to be inferred.

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