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weird MAF issues

Discussion in 'A3/S3 Forum (8L Chassis)' started by JaseS3, Nov 10, 2013.

  1. JaseS3
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    JaseS3 Member

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    [Nov 10, 2013]
    Anyone got any ideas on this weirdness!

    Car is an s3 8l (2000) . Decat, 007p, n249 delete and remapped.

    Noticed my maf readings where low on vcds (no codes though) and my mate had a brand new seat altea maf (chinese jobby) to hand so gave it a try and the car ran much better... easy then I thought, I'll grab a new s3 bosch maf job done.
    Before I bought one I tried another mates genuine cupra r maf seems as the engine is the same, logged his on vcds and the maf works fine but when I ran it on mine it drove awful!

    Things I noticed on my car with each maf :
    Cupra maf-
    Airflow waaay down to about 150gs (same maf reads about 210 gs on the cupra)
    After 4k the ecu drops requested boost progressively (limp?) but before 4k its fine and fuelling looked ok throughout

    Altea maf (wrong maf!)
    Below 2k its not as smooth but on a run airflow reads about 200gs and it pulls much better 2k upwards without ecu dropping requested boost
    Only thing is the stft goes to about -7 and Itft to about -15!!!

    Why would the car run much better with the wrong maf and fueling out! :-/ anyone?!
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  2. jojo
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    jojo Looking for Boost! Staff Member Moderator

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    [Nov 11, 2013]
    Wideband vs Narrow band MAF? there are different MAFs for different versions of the same engine, you just need the correct one!
    #2
  3. JaseS3
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    JaseS3 Member

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    [Nov 11, 2013]
    Aha! Thanks JoJo I didn't know that, that makes sense. the only problem is that all the MAF's I'm finding say that they're suitable for all S3 8L's. I don't suppose you know the different part numbers so I can find out which one I need, I'm guessing narrow band for a Wreg (2000)?
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  4. beachbuggy
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    beachbuggy Well-Known Member

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    [Nov 11, 2013]
    There is an M part number and E part number. These can also have X after them. IE EX and MX which signifies they are exchange units.

    The M is wideband and E is Narrow band ( APY Engine )
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  5. JaseS3
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    JaseS3 Member

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    [Nov 11, 2013]
    Thanks beachbuggy, I'm excited that I might finally get it sorted & hopefully get some power back! :) is TPS the only acceptable place to get a genuine MAF? Seems most posts say stay away from eurocarparts?
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