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Thread: Can you tune up the AFM?

  1. #1
    Junior Member Grease Monkey
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    Thumbs down Can you tune up the AFM?

    hey guys my adjustment screw on the AFM was messed with before i bought it.. it was running dangerously lean and would buck during cold start really bad.. i turned the screw a turn or two and made a big difference to the bucking so i tried to find a place where it felt right.

    Can you check to see if the AFM screw if in the right position with say a multimeter or something??

    im worried its still running lean or rich through diff RPMs and wont it all sorted.. any ideas??

    do toyota have a special device to check/adjust so they can charge me an arm and a leg to use??

    thanks guys
    90' GT-Four ST185 RC motor ST205 gearbox!
    New installs Ct20B and Rear Strut Brace!!
    Next to come;
    3SGE cams, Fidanza Adj Cams, WolfKatz fuel rail!!

  2. #2
    Current UZA80 owner Chief Engine Builder JustCallMeOrlando's Avatar
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    Default Re: Can you tune up the AFM?

    The screw on the AFM is mainly used for idle fuelling. It should've been calibrated from the factory and it usually has the measurement stamped on the body near the screw. To meaningfully change the AFR's using the AFM you have to adjust its spring tension and that requires opening it up.
    Teh UZA80 - Project Century - Remotely p00'd by association

  3. #3
    Junior Member Grease Monkey
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    Default Re: Can you tune up the AFM?

    i know it makes a diff during normal driving though. because adjusting it will adjust how the car responds in all circumstances. including bucking through boost.. and when its adjusted it will change..
    90' GT-Four ST185 RC motor ST205 gearbox!
    New installs Ct20B and Rear Strut Brace!!
    Next to come;
    3SGE cams, Fidanza Adj Cams, WolfKatz fuel rail!!

  4. #4
    jay zee zee thir tee Carport Converter HAVABEER's Avatar
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    Default Re: Can you tune up the AFM?

    i also thought that screw was just an idle adjustment and that the timing fueling etc was ECU controlled?
    As they say in the book, assembly is the reverse of dismantling, but slower cos you forgot where all the bits are

  5. #5
    Junior Member Backyard Mechanic
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    Default Re: Can you tune up the AFM?

    what you need is a co meter put up the tailpipe and readjusted.
    any competent mechanic should have one (or access the one).
    2009 aurion
    Purple 2000 Hilux - 1UZ

    assembly is just the opposite of disassembly - just you swear in different spots!

  6. #6
    Junior Member Carport Converter Z2TT's Avatar
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    Default Re: Can you tune up the AFM?

    Yeah you can adjust the mixtures with the spring tension, I did it on my 1g-gte and it feels a little more responsive, would be good to play on the dyno with it.

  7. #7
    ANGRY MAN 2011 Chief Engine Builder Admiral coFF33's Avatar
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    Default Re: Can you tune up the AFM?

    Backyard spec is playing with AFM cog...

    go get a SAFC2 , they are around $200 now and you can tune your fuel to your hearts content.

  8. #8
    Cressidaspert Carport Converter andrew_mx83's Avatar
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    Default Re: Can you tune up the AFM?

    flap style AFM?

    yes the screw is only for idle, it is an air bypass. so screw it out (counterclockwise) to let more unmetered air in and run leaner, or screw it down (clockwise) to let less unmetered air in and run richer. yes it will make a difference across the whole engine range but is mainly for idle as the effects would be bugger all once there is decent airflow.


    to change running mixture take the plastic cap off and screw around with the spring tension
    There is no substitute for PUBIC inches

    Never late in an x8

  9. #9
    Toymods member no 341 Domestic Engineer amichie's Avatar
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    Default Re: Can you tune up the AFM?

    There is a marking on most AFMs showing the original setting. I will try and find the very old thread that shows you how to restore it to factory setting.

  10. #10
    Toymods member no 341 Domestic Engineer amichie's Avatar
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    Default Re: Can you tune up the AFM?

    Found it.

    There is a number stamped next to the plugged adjuster hole on the AFM.

    the info stated that the number stamped was the depth setting from the top of the relief to the top of the screw head under the plug.

    per the Toyota TCCS book

    casting number/ distance from top of casting to top of screw
    30 / 13.0mm
    26 / 12.6mm
    24 / 12.4mm

  11. #11
    Junior Member Grease Monkey
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    Default Re: Can you tune up the AFM?

    WOW.. fantastic mate.. also.. ive got a Emanage blue to install for fuel and ignition
    90' GT-Four ST185 RC motor ST205 gearbox!
    New installs Ct20B and Rear Strut Brace!!
    Next to come;
    3SGE cams, Fidanza Adj Cams, WolfKatz fuel rail!!

  12. #12
    Cressidaspert Carport Converter andrew_mx83's Avatar
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    Default Re: Can you tune up the AFM?

    then why fuck with the AFM?????
    There is no substitute for PUBIC inches

    Never late in an x8

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