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air escape ?

jay1601 Dec 17, 2010

  1. jay1601

    jay1601 Well-Known Member

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    hi,

    for the past few days it sounds like its got a bird under the bonnet (annoying whistling noise)

    opened the bonnet today, i can hear air leaking from somewhere near the turbo/DV/intake pipe

    is there any common faults near this area

    also sometimes it will also idle at 1200-1500RPM (not all the time)

    not sure if this is linked at all

    thanks for any help/info

    Jay
     
  2. Nilz

    Nilz Defo worth the wait :) Team Ibis TFSI Owners Group quattro Audi A4 S-line owners group saloon Manual

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    Its very regular and common for the pipes under the bonnet to perish and deteriorate, it could be one of many, just do a feel/visual check, it cleary sounds like there is a vac leak somewhere....

    Spray some carb cleaner around the area, if you notice the revs changing, you may be able to find the leak a little easier.
     
  3. jay1601

    jay1601 Well-Known Member

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    still reading -20 to -24 on the boost gauge

    would the standard DV leak air ?
     
  4. Welly

    Welly VX220 SC Driver :)

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    Possible, but it's the change in revs that's interesting. Typical of a leak.

    I would recommend replacing all the hoses in that area. Good practise anyway to avoid future leaks.
     
  5. A3 Oly

    A3 Oly Member

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    Right so i am thinking 98 a3 1.8t's shouldnt make a kinda whistling noise on idle?
     
  6. hatchs3

    hatchs3 New Member

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    NO they shouldn't. From experience check the air inlet pipe - which is past the MAF unit. There is a crankcase breather return pipe which comes into this main moulded pipe from the side, check that there are no splits in the region of this join. At this point the air is unmetered - so the mixture will be very very lean . I know - I had 8 new exhaust valves about 2.5mnths ago. Check the condition of the other hoses from the crankcase breather - the oil vapour will degrade the hoses (excess oil vapour is probably worn valve guides).

    Hope this helps.
     
  7. jay1601

    jay1601 Well-Known Member

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    good info Hatchs3 i will check mine asap

    :icon_thumright:
     
  8. A3 Oly

    A3 Oly Member

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    Ditto, thanks Hatchs3 i will do the same although its a wee bit dark now.

    Hey jay, Same a3's me and u gold and 98 and 1.8t....... :)
     
  9. jay1601

    jay1601 Well-Known Member

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    does yours say "yellow" on the log book aswell ?
     
  10. A3 Oly

    A3 Oly Member

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    Yep lol

    Is it more liquid yellow than gold? i aint sure, but it certainly aint yella!
     
  11. A3 Oly

    A3 Oly Member

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    Actually bout u and i having same year etc, have u had a remap? and was it an **** to get done? as i have had problem after problem getting it done but just waiting for revo to sort right harness out for my ecu. I have the agu lump.
     
  12. jay1601

    jay1601 Well-Known Member

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    mine is 1999 (T)

    its being remapped after xmas

    but i am not going to Revo, i'm going up to R-tech to have it done, cheapier and get alot more for your money
     
  13. jay1601

    jay1601 Well-Known Member

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    i found out the problem.

    fitted my Forge 007P today, as i took the vacuum pipe off the top of the DV, i noticed the hose was split where it joined the metal rail from the inlet manfold.

    replaced with a silicone hose, and its stopped the air noise.
     
  14. Nilz

    Nilz Defo worth the wait :) Team Ibis TFSI Owners Group quattro Audi A4 S-line owners group saloon Manual

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    Good stuff, glad you got it sorted mate.
     

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