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Thread: 17439 tuning valve

  1. #1
    Join Date
    Sep 2017
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    Larne,Antrim, UK
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    22

    17439 tuning valve

    Bought my first a2 in September. A 2001 1.4 with a glass roof. Was so impressed that I bought two more. Sister in law took that one. I bought two 1.6 fsi models. A 2003 and a 2004. Daughter got the 2004 one and I have the 2003 with 92000 miles. Nice car but with a bit of lacquer peel but red cars seem to do that.

    If that was the only fault I would be happy but it has the manifold tuning valve fault and associated random multiple and cylinder one misfire. Will accelerate ok if I build the revs up gently but under any load it runs lumpy like it is misfiring. I suspect the vacum side of the flap is not operating correctly. I have exercised the flap with Vagcom and seems to work ok.

    Does anyone have a circuit diagram of the intake manifold system and a diagram with the parts labelled so I know what part does what.

    Is there a manual to help with maintainence as Haynes donít seem to do one and I like to do my own servicing.

    Thanks Brian

  2. #2
    Join Date
    Aug 2015
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    Hi Brian
    I find 7zap quite handy for parts and Diagrams, as they have the OEM parts photos and list part numbers and names ...
    try this link as may be of help ..
    https://audi.7zap.com/en/rdw/audi+a2.../1/133-133005/

    I do know the FSI's have a habit of snapping the plastic shaft that moves the intake flaps as a weak point and common fault as you mention the actuator seems to work possibly the shaft itself is snapped so the flaps or some of the flaps are not opening and closing , although just a guess and affraid i think its a strip down to be 100%...

    hopefully someone knowledgable on the fsi will be along to help

    Regards Gary
    Last edited by JIGSAW; 12-10-2017 at 11:08 AM.

  3. #3
    Join Date
    Dec 2014
    Location
    Danderyd, Sweden
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    This is my bible for the 1.6 Fsi injection system: http://www.volkspage.net/technik/ssp/ssp/SSP_253.pdf

    1.6 FSI. COBALT BLUE, S-line, OSS (Working), half leather sport seats, Cruise Control, Dis, ACC, Front Electric windows, Alarm
    My mods: Seat Heating, Osram LED DRL/Fog lights,
    Projector HID headlights, VALEO Light sensor, reinstalled Consert II, S-line 17" wheels, Koni FSD and ST Lowering Springs (Rebranded Weitec), RemoteKey comfort controller, detachable tow-bar, EBC Green pads and EBC slotted discs.


    My vehicles:
    Audi A2 1.6 FSI -2003, Audi A3 2.0 Q TFSI S-Line S-tronic -2018, Mercedes ML 350 Bluetec AMG -2015

  4. Users that liked this post:

    damadgeruk (12-10-2017)

  5. #4
    Join Date
    Sep 2017
    Location
    Larne,Antrim, UK
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    Thumbs up

    Quote Originally Posted by JIGSAW View Post
    Hi Brian
    I find 7zap quite handy for parts and Diagrams, as they have the OEM parts photos and list part numbers and names ...
    try this link as may be of help ..
    https://audi.7zap.com/en/rdw/audi+a2.../1/133-133005/

    I do know the FSI's have a habit of snapping the plastic shaft that moves the intake flaps as a weak point and common fault as you mention the actuator seems to work possibly the shaft itself is snapped so the flaps or some of the flaps are not opening and closing , although just a guess and affraid i think its a strip down to be 100%...

    hopefully someone knowledgable on the fsi will be along to help

    Regards Gary
    Thanks Gary. Very useful diagram
    Brian
    Itís really wet here.

  6. #5
    Join Date
    Sep 2017
    Location
    Larne,Antrim, UK
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    Thanks. Lot of information in that article.
    Brian.
    Itís really wet here.

  7. #6
    Join Date
    Sep 2017
    Location
    Larne,Antrim, UK
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    The plastic shaft is intact. Does anyone know what way the vacuum works the flaps and how to test it. I suspect it only operates under load independently of the Ecu.
    Itís really wet here.

  8. #7
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    Aug 2012
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    Alton, Hampshire, United Kingdom
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    Quote Originally Posted by Chiefmechanic View Post
    The plastic shaft is intact. Does anyone know what way the vacuum works the flaps and how to test it. I suspect it only operates under load independently of the Ecu.
    Hi,

    the tumble flaps in the manifold should be in line with the airflow in "normal" engine mode and at an angle in stratified and lean burn mode. The latter only happens when the engine and exhaust are up to temperature, the NOx storage catalyst isn't full and the engine is running at specific loads.

    The ECU adaption for the flaps will cycle them between the two extremities of their movement. You need to do ECU basic settings number 142 with VAG COM to run the flap adaption routine. This will allow you to see the flaps move and report if there is a problem. If the manifold is clogged with carbon deposits then this can prevent the flaps from reaching their correct positions. Worst case, the "blockage" can causes the plastic parts to snap.

    Measuring block 142 should also show the expected and actual positions of the flaps. If there is an obstruction then this should show up as a difference. The adaptation should also fail with an error (rather than OK) message if the movement isn't correct.

    regards

    Andrew
    Last edited by ajsellors; 12-10-2017 at 11:41 PM.

  9. Users that liked this post:

    damadgeruk (13-10-2017)

  10. #8
    Quote Originally Posted by Chiefmechanic View Post
    The plastic shaft is intact. Does anyone know what way the vacuum works the flaps and how to test it. I suspect it only operates under load independently of the Ecu.
    As a basic test, suck it and see. I disconnected the vac pipe from the solenoid and sucked to confirm the actuator was working. I have since replaced the vac solenoid, the actuator now responds to the engine revving (though other issues still present). I used this solenoid (was £38.90 in Sept)...
    https://www.amazon.co.uk/dp/B0068MZ4...395841_TE_dp_1

  11. #9
    Join Date
    Sep 2017
    Location
    Larne,Antrim, UK
    Posts
    22
    Thanks for the info. I have performed the flap test at 142 and I get an ok. I also get a 0 and 100. It’s only when the car warms up and is under load that it runs lumpy. I’m sure it’s not a misfire. The temp gauge does not work although Vagcom says 94 degrees. I don’t really understand why the gauge stays at zero but Vagcom can tell the temperature.
    Can anyone tell me if there is a flap controlled by the ecu and one controlled by vacuum as I think my fault is with the vacuum side of things. Brian.
    Itís really wet here.

  12. #10
    So far as I am aware the flap test doesn't tell you the flaps are moving, just that the electrical side is correct. Happy to be informed otherwise.
    Lumpy under load likely misfire or fuel injector /supply.

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