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  1. #1
    vw754's Avatar
    vorsprung Durch Technik

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    MAF SENSOR READINGS...VAG-COM?

    Ive been told a may have a faulty MAF ,although i have power,i dont have economy.
    A4 tid 130 (awx engine) only does 24.6 m.p.g !!!! ive replaced temp sensor,ive heard a fault maf will give wrong readings (although will still work)

    How can i check the readings via vag-com?
    and what are good readings and what are bad?

    Unless theres another reason its heavy on diesel!

    16.00 pounds it used,it did 94.6 miles town driving @ 91.9 pence per litre.

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  3. #2
    bearthebruce's Avatar
    Ross-Tech, LLC

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    Measuring block Group 02 or 03 should display the MAF reading. If you are using a full recent version of VAG-COM, it should suggest the range of typical in spec values.
    -Bruce-
    Ross-Tech, LLC
    Bruce@Ross-Tech.com

  4. #3
    vw754's Avatar
    vorsprung Durch Technik

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    thanks.

  5. #4
    vw754's Avatar
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    hope you guys can tell me if these are good or bad maf readings.

    Tuesday,21,March,2006,12:10:51
    038 906 019 FP,,1.9l R4 EDC 0000SG 1467,
    ,Group A:,'003,,,,Group B:, Not Running,,,,Group C:, Not Running
    ,,Engine speed,MAF (specified),MAF (actual),EGR duty cycle,,,,,,,,,,
    ,TIME,790-870,230-310,210-350,40-75%,TIME,,,,,TIME,,,,
    Marker,STAMP, /min, mg/str, mg/str, %,STAMP,,,,,STAMP,,,,
    ,0.01,1848,850.0,1117.2,4.8,,,,,,,,,,
    ,0.35,1890,850.0,1131.9,4.8,,,,,,,,,,
    ,0.69,1932,850.0,1117.2,4.8,,,,,,,,,,
    ,1.03,1974,850.0,1146.6,4.8,,,,,,,,,,
    ,1.36,2016,850.0,1161.3,4.8,,,,,,,,,,
    ,1.70,2058,850.0,1166.2,4.8,,,,,,,,,,
    ,2.04,2100,850.0,1185.8,4.8,,,,,,,,,,
    ,2.38,2163,850.0,1151.5,4.8,,,,,,,,,,
    ,2.73,2205,850.0,1146.6,4.8,,,,,,,,,,
    ,3.08,2163,240.0,563.5,51.0,,,,,,,,,,
    ,3.44,2205,245.0,583.1,4.8,,,,,,,,,,
    ,3.80,2184,240.0,563.5,4.8,,,,,,,,,,
    ,4.16,2121,235.0,553.7,4.8,,,,,,,,,,
    ,4.52,2058,235.0,529.2,4.8,,,,,,,,,,
    ,4.88,2037,230.0,529.2,4.8,,,,,,,,,,
    ,5.24,1995,230.0,519.4,4.8,,,,,,,,,,
    ,5.60,1953,230.0,524.3,4.8,,,,,,,,,,
    ,5.95,1890,230.0,514.5,4.8,,,,,,,,,,
    ,6.31,1827,230.0,499.8,4.8,,,,,,,,,,
    ,6.67,1785,230.0,504.7,4.8,,,,,,,,,,
    ,7.03,1743,230.0,490.0,4.8,,,,,,,,,,
    ,7.39,1701,230.0,494.9,4.8,,,,,,,,,,
    ,7.75,1680,235.0,490.0,4.8,,,,,,,,,,
    ,8.11,1659,235.0,490.0,4.8,,,,,,,,,,
    Tuesday,21,March,2006,12:13:56
    038 906 019 FP,,1.9l R4 EDC 0000SG 1467,
    ,Group A:,'003,,,,Group B:, Not Running,,,,Group C:, Not Running
    ,,Engine speed,MAF (specified),MAF (actual),EGR duty cycle,,,,,,,,,,
    ,TIME,790-870,230-310,210-350,40-75%,TIME,,,,,TIME,,,,
    Marker,STAMP, /min, mg/str, mg/str, %,STAMP,,,,,STAMP,,,,
    ,0.01,2394,795.0,1038.8,4.8,,,,,,,,,,
    ,0.38,2436,725.0,965.3,31.9,,,,,,,,,,
    ,0.74,2499,665.0,779.1,40.2,,,,,,,,,,
    ,1.10,2520,425.0,690.9,60.2,,,,,,,,,,
    ,1.46,2541,475.0,578.2,67.3,,,,,,,,,,
    ,1.82,2562,400.0,504.7,73.7,,,,,,,,,,
    ,2.18,2583,400.0,450.8,77.3,,,,,,,,,,
    ,2.54,2604,360.0,416.5,81.3,,,,,,,,,,
    ,2.90,2625,370.0,382.2,81.7,,,,,,,,,,
    ,3.25,2646,355.0,347.9,81.7,,,,,,,,,,
    ,3.60,2625,325.0,333.2,81.3,,,,,,,,,,
    ,3.96,2667,320.0,303.8,84.5,,,,,,,,,,
    ,4.31,2688,630.0,475.3,4.8,,,,,,,,,,
    ,4.65,2667,285.0,534.1,4.8,,,,,,,,,,
    Tuesday,21,March,2006,12:20:39
    038 906 019 FP,,1.9l R4 EDC 0000SG 1467,
    ,Group A:,'003,,,,Group B:, Not Running,,,,Group C:, Not Running
    ,,Engine speed,MAF (specified),MAF (actual),EGR duty cycle,,,,,,,,,,
    ,TIME,790-870,230-310,210-350,40-75%,TIME,,,,,TIME,,,,
    Marker,STAMP, /min, mg/str, mg/str, %,STAMP,,,,,STAMP,,,,
    ,0.01,2373,525.0,632.1,84.5,,,,,,,,,,
    ,0.37,2394,505.0,583.1,84.5,,,,,,,,,,
    ,0.72,2394,510.0,558.6,84.5,,,,,,,,,,
    ,1.06,2394,505.0,519.4,84.5,,,,,,,,,,
    ,1.41,2415,625.0,646.8,4.8,,,,,,,,,,
    ,1.76,2436,600.0,788.9,35.5,,,,,,,,,,
    ,2.12,2457,595.0,803.6,53.4,,,,,,,,,,
    ,2.47,2457,575.0,739.9,63.4,,,,,,,,,,
    ,2.82,2478,585.0,720.3,73.7,,,,,,,,,,
    ,3.17,2499,565.0,686.0,78.1,,,,,,,,,,
    ,3.52,2520,550.0,656.6,84.5,,,,,,,,,,
    ,3.87,2520,550.0,632.1,84.5,,,,,,,,,,
    ,4.21,2541,560.0,612.5,84.5,,,,,,,,,,
    ,4.55,2541,560.0,588.0,84.5,,,,,,,,,,
    ,4.89,2562,610.0,583.1,83.7,,,,,,,,,,
    ,5.22,2583,690.0,759.5,4.8,,,,,,,,,,
    ,5.57,2604,735.0,916.3,30.7,,,,,,,,,,
    ,5.91,2646,735.0,984.9,36.7,,,,,,,,,,
    ,6.25,2667,735.0,882.0,46.2,,,,,,,,,,
    ,6.59,2709,715.0,808.5,53.8,,,,,,,,,,
    ,6.93,2709,715.0,769.3,57.4,,,,,,,,,,
    ,7.27,2730,715.0,744.8,60.2,,,,,,,,,,
    ,7.61,2772,715.0,754.6,63.0,,,,,,,,,,
    ,7.95,2793,715.0,730.1,64.1,,,,,,,,,,
    ,8.29,2814,710.0,725.2,66.5,,,,,,,,,,
    ,8.63,2835,610.0,666.4,72.1,,,,,,,,,,
    ,8.96,2856,585.0,612.5,74.1,,,,,,,,,,
    ,9.30,2856,570.0,583.1,76.1,,,,,,,,,,
    ,9.66,2877,550.0,529.2,77.3,,,,,,,,,,
    ,10.01,2898,540.0,504.7,75.7,,,,,,,,,,
    ,10.37,2898,555.0,499.8,72.9,,,,,,,,,,
    ,10.73,2919,550.0,494.9,67.7,,,,,,,,,,
    ,11.09,2940,550.0,480.2,62.6,,,,,,,,,,
    ,11.45,2940,540.0,485.1,57.0,,,,,,,,,,
    ,11.80,2961,555.0,490.0,51.8,,,,,,,,,,
    ,12.15,2961,555.0,539.0,50.2,,,,,,,,,,
    ,12.51,2982,570.0,573.3,51.4,,,,,,,,,,
    ,12.88,2982,560.0,607.6,53.0,,,,,,,,,,
    ,13.24,2982,560.0,588.0,56.6,,,,,,,,,,
    ,13.59,3003,610.0,568.4,58.2,,,,,,,,,,
    ,13.95,3024,805.0,906.5,4.8,,,,,,,,,,
    ,14.31,3066,810.0,1249.5,4.8,,,,,,,,,,
    ,14.67,3066,535.0,710.5,4.8,,,,,,,,,,
    ,15.02,3087,425.0,612.5,4.8,,,,,,,,,,
    ,15.38,3045,350.0,602.7,4.8,,,,,,,,,,
    ,15.74,3066,355.0,548.8,47.8,,,,,,,,,,
    ,16.10,3045,355.0,480.2,58.6,,,,,,,,,,
    ,16.45,3066,370.0,436.1,59.4,,,,,,,,,,
    ,16.81,3045,365.0,445.9,63.8,,,,,,,,,,
    ,17.17,3045,365.0,387.1,66.1,,,,,,,,,,
    ,17.53,3045,365.0,362.6,68.1,,,,,,,,,,
    ,17.89,3045,365.0,357.7,68.1,,,,,,,,,,
    ,18.25,3024,365.0,338.1,67.3,,,,,,,,,,
    ,18.60,3024,410.0,347.9,4.8,,,,,,,,,,
    ,18.95,3045,620.0,759.5,23.5,,,,,,,,,,
    ,19.30,3045,725.0,950.6,31.1,,,,,,,,,,
    ,19.65,3066,740.0,867.3,40.2,,,,,,,,,,
    ,20.00,3087,790.0,980.0,4.8,,,,,,,,,,
    ,20.34,3087,505.0,744.8,4.8,,,,,,,,,,
    ,20.70,3108,430.0,597.8,4.8,,,,,,,,,,
    ,21.05,3108,560.0,661.5,4.8,,,,,,,,,,
    ,21.40,3108,615.0,725.2,4.8,,,,,,,,,,
    ,21.74,3129,750.0,857.5,4.8,,,,,,,,,,
    ,22.09,3150,785.0,980.0,4.8,,,,,,,,,,
    ,22.44,3171,800.0,945.7,4.8,,,,,,,,,,
    ,22.79,3192,805.0,945.7,4.8,,,,,,,,,,
    ,23.12,3213,805.0,935.9,4.8,,,,,,,,,,
    ,23.47,3234,805.0,940.8,4.8,,,,,,,,,,
    ,23.81,3255,805.0,926.1,4.8,,,,,,,,,,
    ,24.15,3276,805.0,911.4,4.8,,,,,,,,,,
    ,24.49,3297,790.0,886.9,4.8,,,,,,,,,,
    ,24.83,3318,795.0,867.3,4.8,,,,,,,,,,
    ,25.16,3339,805.0,891.8,4.8,,,,,,,,,,
    ,25.50,3360,805.0,896.7,4.8,,,,,,,,,,
    ,25.84,3381,805.0,891.8,4.8,,,,,,,,,,
    ,26.18,3402,805.0,882.0,4.8,,,,,,,,,,
    ,26.51,3423,800.0,867.3,4.8,,,,,,,,,,
    ,26.85,3423,795.0,857.5,4.8,,,,,,,,,,
    ,27.19,3444,795.0,857.5,4.8,,,,,,,,,,
    ,27.53,3465,795.0,833.0,4.8,,,,,,,,,,
    ,27.88,3486,800.0,833.0,4.8,,,,,,,,,,
    ,28.23,3486,790.0,833.0,4.8,,,,,,,,,,
    ,28.58,3507,795.0,803.6,4.8,,,,,,,,,,
    ,28.94,3507,800.0,803.6,4.8,,,,,,,,,,
    ,29.30,3507,795.0,788.9,4.8,,,,,,,,,,
    ,29.65,3528,800.0,793.8,4.8,,,,,,,,,,
    ,30.00,3528,835.0,886.9,4.8,,,,,,,,,,
    ,30.36,3549,835.0,1004.5,4.8,,,,,,,,,,
    ,30.72,3570,840.0,916.3,4.8,,,,,,,,,,
    ,31.08,3591,845.0,965.3,4.8,,,,,,,,,,
    ,31.43,3612,845.0,994.7,4.8,,,,,,,,,,
    ,31.79,3633,845.0,989.8,4.8,,,,,,,,,,
    ,32.14,3633,850.0,994.7,4.8,,,,,,,,,,
    ,32.50,3654,850.0,965.3,4.8,,,,,,,,,,
    ,32.86,3675,850.0,960.4,4.8,,,,,,,,,,
    ,33.22,3675,850.0,984.9,4.8,,,,,,,,,,
    ,33.58,3696,850.0,999.6,4.8,,,,,,,,,,

  6. #5
    1st Gear

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    The peak values are OK, but the graph itself looks a little bit erratic.
    Sebastian @ Ross-Tech.com

  7. #6
    vw754's Avatar
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    im lost what does this mean? im not very good with these things,now cars starting to hesitate in the morning, when i put my foot down i get hesitataton,puff of black smoke,and then it go's.

    Ive replaced the maf with a new one from audi,problems not gone though(long starting,heavy fuel consumption)

    oh and readings taken while driving in 4th gear at 3 an half thousand rpm.

 

 

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