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can someone tell me the difference between these three valves...???

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by prel2000, May 21, 2007.

  1. prel2000
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    prel2000 Member

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    [May 21, 2007]
    what is the ultimate difference between these three valves? are they all present in the 1.8T engine? and what are their functions?

    [​IMG]
    part number: 026 906 283J

    [​IMG]
    part number: 034 906 283J

    [​IMG]
    part number: 028 906 283

    Thanks.
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  3. Mcgough
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    Mcgough Member

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    [May 21, 2007]
    they are in exact order......

    a woof woof

    a poof poof

    and a swoosh swoosh

    hope that helps!
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  4. inigoj
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    inigoj Member

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    [May 21, 2007]
    They are all 'electropneumatic valves', simply an electrically controled variable pressure/vacuum valve.

    They are generally used in the boost control system, and EGR control system, basically anywhere an ECU controlled valve is needed.

    They are all pretty much the same basic design, some just open a different amount at a different voltage, or have a different number of inlet/outlets.

    Some valve info

    http://www.msi-motor-service.com/ximages/pg_si_0087_en_web.pdf

    http://www.msi-motor-service.com/ximages/pg_si_0089_en_web.pdf

    http://www.msi-motor-service.com/ximages/pg_si_0076_en_web.pdf
    #3

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