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Thread: Mass Air Flow Meter Values ?

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    Regular Member marcdale's Avatar
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    Default Mass Air Flow Meter Values ?

    Is it possible for anyone to post the expected g/s value for the MAF on a 3.2 Petrol GSi?

    Min or Max expected values or maybe a reading from your car if you have diagnostic's capability.

    Thanks very much

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    [Ex]Admin Duncan's Avatar
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    Less than 20 kg/h is the expected value - so in g/s that's gonna be less than 5.55 g/s.

    HTH

    D

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    [Ex]Admin Duncan's Avatar
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    P.S. There's also an electrical test you can do if you want to test the voltage being sent?

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    Vehicle : Golf 7

    Trim : GTD

    Engine : 2.0 TDI 184PS

    Year : 2014

    Mileage : 40000

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    At 4000rpm - peak torque ~ 239cfm

    At 6200rpm - peak power ~ 295cfm

    Basic mathematics - a meter would obviously give much better readings.

    Gazza4

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    [Ex]Admin Duncan's Avatar
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    Quote Originally Posted by Duncan View Post
    Less than 20 kg/h is the expected value - so in g/s that's gonna be less than 5.55 g/s.
    Forgot to say - that's with the following criteria -

    • Engine running at idle speed, operating temperature
    • All consumers turned off
    • Accelerator pedal not actuated


    Gazza - how do you get those cubic feet per minute figures?

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    Regular Member marcdale's Avatar
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    Guys, thanks for the replies.

    So can I tell if the MAF is working through the whole rev/mph range by simply testing the values at idle with all toys turned off?

    It's not necessary to test the values at speed or anything like that?

    I have a laptop and OBDII software, on the motorway an hour or 2 ago I got it up to just short of 90 g/s with my foot down.

    I am getting a misfire, so I don't know if the reading seems low because it misfires, or if it misfires because the g/s seems low if you see what I mean. Chicken and Egg sort of question really.

    Or does 90g/s seem reasonable to you?

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    [Ex]Admin Duncan's Avatar
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    Quote Originally Posted by marcdale View Post
    So can I tell if the MAF is working through the whole rev/mph range by simply testing the values at idle with all toys turned off?

    It's not necessary to test the values at speed or anything like that?
    The values, and criteria, for testing the MAF in my post are as per the Vx tech docs, so I'd assume that if it's not giving the right figures there it's not going to give the right ones at higher revs - and vice versa.

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    Regular Member marcdale's Avatar
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    Quote Originally Posted by Duncan View Post
    The values, and criteria, for testing the MAF in my post are as per the Vx tech docs, so I'd assume that if it's not giving the right figures there it's not going to give the right ones at higher revs - and vice versa.
    Oh great, so it's a recommended to test them. Sweet, I'll pop that on my list for tomorrow.

    Thanks very much for that.

    Would a low reading mean it's ****ged, or is there a possibility of cleaning them. I read on other forums that you can try cleaning them with some non residue electronic circuit cleaner, in a spray can obviously, so your not touching it with your fingers or a cloth etc.

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    [Ex]Admin Duncan's Avatar
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    You can certainly clean them. Isopropyl Alcohol (Isopropanol) would be a safe bet, or as you said some non-residue contact cleaner stuff. Just be careful which one you use. Isopropanol is definitely a safe bet.

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    Regular Member marcdale's Avatar
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    Ok, i'll put that on my list for tomorrow too!

    I made the mistake of using filter oil on my induction kit some time ago and there is a thin coating of oil inside the plenum chamber, so i'm assuming the inside of the MAF is the same.

    It's been like that for ages so I don't think it's causing the misfire but it might be effecting MPG or something along those lines if it's slightly off the mark.

    Cheers very much.

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