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Better running with different MAF sensor?

Discussion in 'Diesel forum' started by Nessy, Sep 26, 2006.

  1. Nessy
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    Nessy VW + Audi mad

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    [Sep 26, 2006]
    A few weeks ago I bought via Ebay a Pierburg MAF sensor for my A4 TDi 110 as I had been told by the previous owner of my car it had received a new MAF sensor but he had lost the invoice......
    Worried that it might have been a cheapo one I bought the Pierburg one as it even came with a little torx-style bit to be able to remove the sensor....something I didn't have before and so had been unable to get the old one out to see what make it was.
    It turned out that the old sensor was a Bosch and the Pierburg went straight in with no problem.
    This brings me to my question, with the new Pierburg sensor the engine really does seem much more flexible, before with the Bosch sensor the car would struggle to do 30mph in 5th gear without hunting, now in 5th at 30 the car is fine.....
    Anyone else noticed a difference with different sensors? I don't think the Bosch sensor was faulty as it was only about 6 months old (supposedly) when I removed it, but the car does seem to run better with the Pierburg one......
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  3. Macduff
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    Macduff Member

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    [Sep 26, 2006]
    No idea on the MAFs but why would you be in 5th at 30? I wouldn't be higher than 3rd at that speed. The car is much more responsive and it doesn't really affect MPG that much. I've also read that driving a diesel at such low revs can soot up the turbo.
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  4. fjtwelve
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    fjtwelve Moderator Staff Member Moderator

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    [Sep 26, 2006]
    Maybe as you half suspected the MAF hadn't been replaced and was on the way out anyway. I put a Pierburg on my old 110hp Passat TDi and it worked as well as the previous Bosch, no significant difference.
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  5. Nessy
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    Nessy VW + Audi mad

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    [Sep 26, 2006]
    I don't go around on the whole doing 30 mph in 5th!!!!
    Just using that as an example of how much more tractable the car seems to be....
    Before the sensor change there's no way it would have taken 5th at such a low speed, now there's no problem!
    Perhaps the sensor hadn't been changed by the previous owner, but am glad I took the gamble and got the Pierburg one.....
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  6. fjtwelve
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    fjtwelve Moderator Staff Member Moderator

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    [Sep 27, 2006]
    You've started a how slow can i go contest now. Mine will plod along at 800rpm tick over in 6th, about 26mph, and will slowly pull away without any shudder or glitch.
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  7. Griffter
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    Griffter New Member

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    [Sep 28, 2006]
    Removed mine at the w/e to clean it - it's a Pierburg. Having cleaned it (just by squirting lots of contact cleaner through the gauze on to the sensor) car is possibly more responsive, but more noticably doesn't cut the turbo over 3k rpm which it occasionally used to. Didn't notice any torx screws though?!

    And the road leading to where I live has ****** speed bumps and a 20 mph limit. I can pop the car in fourth, and trundle along with my foot off the accelerator at (what appears to be) exactly 20 mph.
    #6
  8. necroeire
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    necroeire Active Member

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    [Sep 28, 2006]
    Can someone give us an idea where to find the MAF sensor? I've no idea even where to look. While idling in trafic the car sometimes gives a shudder - like someone walked over it's grave. Anyhow I'd like to check the MAF sensor as I don't think it has ever been changed on my car. Thanks.
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  9. Jason
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    Jason Member

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    [Sep 28, 2006]
    Straight after your air-filter direction inlet manifold, you will see a jobby doodle with 2 torx screws with a pip in the middle and a cable going to it!

    I use a pair pliers to undo mine which I take out and clean very carefully with cotton buds and petrol.The first time I cleaned it was after buying the car and discovering a massive flat spot after 3000 revs after cleaning it was like finding another 80bhp and no flat spot!!tried it on the wife's New beetle but it didn't work so had to buy a new one (£70) and again wow what a difference it made even she noticed!!!!!!!!!!!!!
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  10. necroeire
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    necroeire Active Member

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    [Sep 29, 2006]
    I'm completly think when it comes to finding parts in the motor, can you post a pic please of where to find it?
    #9
  11. Jason
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    Jason Member

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    [Sep 29, 2006]
    I will try and take you a pic of maf tomorrow (It's too dark now!)
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  12. ribena
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    ribena Member

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    [Sep 30, 2006]
    quick query on the subject of this thread

    just recently my yellow ecu light has come after a noticeable hiccup? in revs

    this has happened 3 or 4 times now usually at around 2.5-3k revs and at any temp

    the light has gone off after restarting a couple of times then come on again after another couple of journeys

    was thinking of just giving the MAF a good clean with some brake cleaner ( any other suggestions ) but all other MAF threads have not mentioned the ecu light coming on

    its due into audi for a lower suspension arm soon but could do w/out another bill for the sake of getting mucky hands for an hour

    edit : no noticeable power loss

    anybody ??
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  13. Jason
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    Jason Member

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    [Sep 30, 2006]

    Sorry mate!

    Got you a pic of a maf sensor but I can't get it onto forum for you!!
    #12
  14. Jason
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    Jason Member

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    [Oct 22, 2006]
    Any one tell me why I can't post attachments??????
    #13
  15. Rev-head
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    Rev-head Active Member

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    [Oct 22, 2006]
    Go to www.photobucket.com download your pics there and copy and paste the IMG bar (below PIC on there website )on to your thread

    Cheers
    #14
  16. Jason
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    Jason Member

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    [Oct 23, 2006]
    #15
  17. Rev-head
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    Rev-head Active Member

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    [Oct 23, 2006]
    copy the Img bar and you will get pic on thread
    [​IMG]
    #16
  18. Jason
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    Jason Member

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    [Oct 23, 2006]
    http://i142.photobucket

    Oh yeh!

    Ps:You have to take a plastic cover off to get this image-just clips off air filter!!
    #17

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