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2.5TDI needle lift sensor

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by Mike B, Nov 20, 2010.

  1. Mike B

    Mike B Member

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    VAGcom diagnoses faulty sensor on the injector causes poor starting and smoky exhaust low mpg .Any one know what the sensor does and if when it fails if it causes overfueling thus these symptoms.part costs £300plus vat from Audi
     
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  3. quattrojames

    quattrojames Moderator
    Staff Member Moderator Audi Avant Owner Group Audi A6

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    From memory the needle valve regulates and helps to calibrate fuel pump flow in relation to the amount coming out of the injectors, so will very likely be a cause of over fueling. And they are expensive little buggers too.
     
  4. Mike B

    Mike B Member

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    Thanks James new Bosch injector found for just over £200 due here Mon to be fitted and see if it fixes these probs which have been with us all year
     
  5. quattrojames

    quattrojames Moderator
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    Apologies if this is a stupid thing to say...... only one of the injectors has the needle lift sensor on it, so be sure that's the one you're getting!
     
  6. Mike B

    Mike B Member

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    Seems OK James cos we got part nos from Audi.Car sb back tomorrow hoping to have improvements all round but mostly mpg Quattro triptronic only averidging29 but the similar manual 36 both with tuning boxes
     
  7. A4 nut

    A4 nut Member

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  8. quattrojames

    quattrojames Moderator
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  9. Turkster

    Turkster Bro.Paul 2.5TDI Quattro Sport

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  10. murran

    murran Active Member

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    have you checked the resistance thru it? should be around 100ohms if memory serves.... if its way off or open circuit you know its faulty.
     
  11. Mike B

    Mike B Member

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    Replacement fitted and there seems much less smoke.Starting OK but always was in cold weather.Now for mpg just refilled full tank shows down to 26mpg but hoping this has sorted unburnt fuel causing smoky exhaust and lets see next refill .Fault code cleared and not returned so seems like we should have fixed this long ago but at £400 you need to be convinced its worth it
     
  12. A4 nut

    A4 nut Member

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    Glad its all sorted bud hope the mpg goes up keep us posted.
     
  13. adamss24

    adamss24 Well-Known Member

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    Remember the petrol stations have switched to winter fuel since november so the average mpg will be much lower...
     
  14. Mike B

    Mike B Member

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    Not heard this before Adams How much lower and is this only diesel?
     
  15. jamin128

    jamin128 Member

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    Where did you find for 200 quid?
     

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