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MAF fault with new Bosch MAF

Miguel_S# Mar 2, 2014

  1. Miguel_S#

    Miguel_S# Active Member

    335
    29
    28
    Hello people.

    i have a audi S3 from year 1999.
    i have this fault 16487 - Mass Air Flow Sensor (G70): Signal too high
    P0103 - 35-10 --- Intermittent
    Car smelled gasoline and Mass Flow g/s are too low.
    i bought a new bosch MAF and fasoline smell disappeared, air flow is good but car remains slow,
    fault 16487 remains.
    With maf disconnected the car is ok.
    log

    [TABLE="width: 384"]
    [TR]
    [TD="width: 64"][/TD]
    [TD="width: 64"]Group A:[/TD]
    [TD="width: 64"]'002[/TD]
    [TD="width: 64"][/TD]
    [TD="width: 64"][/TD]
    [TD="width: 64"][/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD][/TD]
    [TD]RPM[/TD]
    [TD]Load[/TD]
    [TD]Inj. On Time[/TD]
    [TD]Mass Flow[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]TIME[/TD]
    [TD][/TD]
    [TD][/TD]
    [TD][/TD]
    [TD][/TD]
    [/TR]
    [TR]
    [TD]Marker[/TD]
    [TD]STAMP[/TD]
    [TD] /min[/TD]
    [TD] %[/TD]
    [TD] ms[/TD]
    [TD] g/s[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]35.98[/TD]
    [TD="align: right"]2120[/TD]
    [TD]14.3[/TD]
    [TD]1.64[/TD]
    [TD]7.69[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]36.88[/TD]
    [TD="align: right"]2160[/TD]
    [TD]23.3[/TD]
    [TD]2.46[/TD]
    [TD]10.39[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]37.78[/TD]
    [TD="align: right"]2240[/TD]
    [TD]44.4[/TD]
    [TD]4.10[/TD]
    [TD]19.72[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]38.68[/TD]
    [TD="align: right"]2320[/TD]
    [TD]35.3[/TD]
    [TD]5.33[/TD]
    [TD]28.11[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]39.58[/TD]
    [TD="align: right"]2360[/TD]
    [TD]22.6[/TD]
    [TD]2.05[/TD]
    [TD]8.72[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]40.48[/TD]
    [TD="align: right"]2360[/TD]
    [TD]22.6[/TD]
    [TD]2.46[/TD]
    [TD]10.47[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]41.38[/TD]
    [TD="align: right"]2360[/TD]
    [TD]40.6[/TD]
    [TD]3.69[/TD]
    [TD]17.75[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]42.29[/TD]
    [TD="align: right"]2400[/TD]
    [TD]48.1[/TD]
    [TD]5.74[/TD]
    [TD]29.64[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]43.17[/TD]
    [TD="align: right"]2520[/TD]
    [TD]111.3[/TD]
    [TD]11.89[/TD]
    [TD]56.69[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]44.07[/TD]
    [TD="align: right"]2760[/TD]
    [TD]145.1[/TD]
    [TD]15.99[/TD]
    [TD]79.97[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]44.97[/TD]
    [TD="align: right"]2920[/TD]
    [TD]191.7[/TD]
    [TD]20.91[/TD]
    [TD]116.94[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]45.88[/TD]
    [TD="align: right"]3240[/TD]
    [TD]159.4[/TD]
    [TD]17.22[/TD]
    [TD]103.17[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]46.77[/TD]
    [TD="align: right"]3480[/TD]
    [TD]162.4[/TD]
    [TD]17.63[/TD]
    [TD]116.00[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]47.67[/TD]
    [TD="align: right"]3760[/TD]
    [TD]163.2[/TD]
    [TD]17.63[/TD]
    [TD]123.19[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]48.57[/TD]
    [TD="align: right"]4000[/TD]
    [TD]167.7[/TD]
    [TD]18.04[/TD]
    [TD]137.17[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]49.48[/TD]
    [TD="align: right"]4240[/TD]
    [TD]165.4[/TD]
    [TD]18.04[/TD]
    [TD]142.64[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]50.38[/TD]
    [TD="align: right"]4480[/TD]
    [TD]168.4[/TD]
    [TD]18.04[/TD]
    [TD]151.75[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]51.28[/TD]
    [TD="align: right"]4680[/TD]
    [TD]168.4[/TD]
    [TD]18.04[/TD]
    [TD]161.25[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]52.18[/TD]
    [TD="align: right"]4920[/TD]
    [TD]169.9[/TD]
    [TD]18.45[/TD]
    [TD]167.81[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]53.08[/TD]
    [TD="align: right"]5160[/TD]
    [TD]191.7[/TD]
    [TD]21.73[/TD]
    [TD]194.89[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]53.97[/TD]
    [TD="align: right"]5360[/TD]
    [TD]191.7[/TD]
    [TD]21.73[/TD]
    [TD]195.75[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]54.88[/TD]
    [TD="align: right"]5560[/TD]
    [TD]187.2[/TD]
    [TD]21.73[/TD]
    [TD]199.44[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]55.78[/TD]
    [TD="align: right"]5720[/TD]
    [TD]182.7[/TD]
    [TD]21.32[/TD]
    [TD]200.25[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]56.68[/TD]
    [TD="align: right"]5880[/TD]
    [TD]178.9[/TD]
    [TD]20.50[/TD]
    [TD]200.31[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]57.58[/TD]
    [TD="align: right"]6040[/TD]
    [TD]174.4[/TD]
    [TD]20.50[/TD]
    [TD]201.92[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]58.48[/TD]
    [TD="align: right"]6160[/TD]
    [TD]170.7[/TD]
    [TD]20.09[/TD]
    [TD]200.25[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]59.38[/TD]
    [TD="align: right"]6240[/TD]
    [TD]168.4[/TD]
    [TD]19.68[/TD]
    [TD]201.25[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]60.28[/TD]
    [TD="align: right"]6360[/TD]
    [TD]164.7[/TD]
    [TD]19.27[/TD]
    [TD]201.00[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]61.18[/TD]
    [TD="align: right"]6480[/TD]
    [TD]162.4[/TD]
    [TD]19.27[/TD]
    [TD]201.08[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]62.07[/TD]
    [TD="align: right"]6560[/TD]
    [TD]158.6[/TD]
    [TD]18.45[/TD]
    [TD]200.31[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]62.97[/TD]
    [TD="align: right"]6640[/TD]
    [TD]157.1[/TD]
    [TD]18.45[/TD]
    [TD]200.06[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD]63.87[/TD]
    [TD="align: right"]6720[/TD]
    [TD]154.1[/TD]
    [TD]18.04[/TD]
    [TD]199.42[/TD]
    [/TR]
    [/TABLE]
     
  2. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

    20,875
    3,700
    113
    Post screen shots in excel mate... those are pretty difficult to read

    <tuffty/>
     
  3. Miguel_S#

    Miguel_S# Active Member

    335
    29
    28
    maf off
    maf off.jpg ​
     
  4. Miguel_S#

    Miguel_S# Active Member

    335
    29
    28
    maf em

    maf on2.jpg
     
  5. Miguel_S#

    Miguel_S# Active Member

    335
    29
    28
    Someone can help?!?!?!?
     
  6. epox

    epox Active Member

    772
    74
    28
    Have you cleared the faults maf gs is 200 /8 = 250 bhp.

    What makes you think its faulty?
     
  7. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

    20,875
    3,700
    113
    I assume your car is mapped? 200 odd gs suggests it is as does the requested boost... MAF too high faults are normally the result of the airflow exceeding values in the table KFMLDMX... this is the table with diagnostic limits for airflow and is normally lifted a little and tuned cars although I have only seen this personally on big turbo tunes...

    If your car has extra mods to aid airflow (I don't know the spec of your car) then this could be part of the reason why this limit is being reached..

    <tuffty/>
     
  8. Miguel_S#

    Miguel_S# Active Member

    335
    29
    28
    the car is a s3 Apy 210hp form year 1999

    the car is mapped and have a conical filter.
     
  9. Miguel_S#

    Miguel_S# Active Member

    335
    29
    28
    Yes, i clear faults several times.
    the car is too slow dont have 250bhp
     
  10. Miguel_S#

    Miguel_S# Active Member

    335
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    People i already see all intake system.
    The maf connector is ok.
    but the car still runs faster with maf unplugged.
    With maf plugged the injection time is always above 20ms.

    need some help
     
  11. a6_chris

    a6_chris Well-Known Member

    1,883
    160
    63
    Change the Bosch MAF for a genuine Audi MAF.
     
  12. Miguel_S#

    Miguel_S# Active Member

    335
    29
    28
    i already change MAF
     
  13. a6_chris

    a6_chris Well-Known Member

    1,883
    160
    63
    I know but after reading various articles online, the Audi MAFs are the best and most aftermarket ones still provide false/incorrect readings.
     
  14. Miguel_S#

    Miguel_S# Active Member

    335
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    28
    the readings in all logs the g/s are ok,
    i will try with other maf
     
  15. Miguel_S#

    Miguel_S# Active Member

    335
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    i have news.
    I miss a Pipe, the pipe from intake manifol to PCV has a big hole hole.
     
  16. badger5

    badger5 www.badger5.co.uk Site Sponsor

    9,398
    1,943
    113
    air leaks?
    injested airflow looks kinda normal, but if you are down on power, I would be smoke testing it looking for leaks
     

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