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Thread: Correct size of Allen wrench for adjust air/fuel?

  1. #1
    Join Date
    Oct 2012
    Location
    Milwaukee, WI
    Posts
    14
    My Cars
    2000 BMW X5 4.4i 200K

    Correct size of Allen wrench for adjust air/fuel?

    My first question is: Is it an Allen wrench that suppose to be used in that hole? If not, what should be used (phillips, flat head..)?

    If it is an Allen wrench, what size should it be. I've tried 4mm, 4.5mm, 5mm, 5.5mm, 6.5mm & 7mm with no luck.

  2. #2
    Join Date
    Jan 2008
    Location
    NSW,Australia
    Posts
    797
    My Cars
    1981 E21 318i
    Hi ... it's a 3 mm allen and it has to be pretty long. From memory it needs to be about 2.5 inches long just to reach the adjusting screw down inside the AFM plus whatever length handle makes it easy to use.

    Cheers
    Last edited by GDAus; 06-22-2018 at 10:30 AM.
    hmm .. Wonder what happens if I do this ...

  3. #3
    Join Date
    Oct 2012
    Location
    Milwaukee, WI
    Posts
    14
    My Cars
    2000 BMW X5 4.4i 200K
    Quote Originally Posted by GDAus View Post
    Hi ... it's a 3 mm allen and it has to be pretty long. From memory it needs to be about 2.5 inches long just to reach the adjusting screw down inside the AFM plus whatever length handle makes it easy to use.

    Cheers
    Awesome!!! Thanks!!!

  4. #4
    Join Date
    Jun 2013
    Location
    Gordonsville, VA
    Posts
    392
    My Cars
    1983 BMW 320i S
    This is what you want IOT adjust your mixture:

    https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

    It's the right length.

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