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Electro-Hydraulic engine mounts

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by 46TheDoctor, Sep 16, 2007.

  1. 46TheDoctor
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    46TheDoctor Valentino Rossi A.K.A The Doctor

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    [Sep 16, 2007]
    :icon_thumright: When i had my motor remapped they ran a diagnostic and it came up with a fault, (Electro-Hydraulic Engine Mount Solenoid Valve-N144-Open Circuit), i know what it is i just wondered if any of you fellas out there had one replaced and how much it cost to have sorted:icon_thumright:
    #1
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  3. J7USS
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    J7USS Shuddup Foooool!!

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    [Sep 16, 2007]
    is it me or is this becoming quite a common thing in the past couple of weeks, Im sure Ive seen a couple other threads with similar problem!!:think:
    #2
  4. vw754
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    vw754 vorsprung Durch Technik

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    [Sep 17, 2007]
    is this the same as mine?,mine came up engine mount solenoid valve n144-145 open or short,which mounting is this?
    #3
  5. Shonobi
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    Shonobi New Member

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    [Sep 17, 2007]
    Mine is reading Open (N 144)...lets see what the dealer does. Wish me luck tomorrow.

    Cheers
    #4
  6. vw754
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    vw754 vorsprung Durch Technik

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    [Sep 17, 2007]
    Keep me posted,find out what you can,thanks and GOOD LUCK!
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  7. doogleman
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    doogleman Member

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    [Sep 17, 2007]
    I dont know what it is and mine has it also. I ignored it to be honest. What difference does it make to the car or can it be ignored?
    #6
  8. simonwjones
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    simonwjones Member

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    [Sep 17, 2007]
    I believe these stiffen the engine mounts based upon speed.

    Mine throws up the same error as well, but not bothered to do anything about it yet


    Simon
    #7
  9. doogleman
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    doogleman Member

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    [Sep 17, 2007]
    If you're happy, Im happy. Im gonna leave it too.
    #8
  10. Shonobi
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    Shonobi New Member

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    [Sep 18, 2007]
    Any Word yet on this issue?
    #9
  11. technics100
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    technics100 Member

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    [Sep 19, 2007]
    I had the same problem. Its probably the passenger side engine mount. On the later TDi's the mount has a solenoid which controls the rigidity of the mount..

    the way the mounts work is that there is a fluid chamber with a plastic body in the middle of it, with small channel cut through it. this allows fluid from the top chamber, through the plastic body, to the bottom chamber. the bottom chamber is rubber lined and can deform under pressure. there is also an airway vented to atmosphere, with a rubber membrane separating the fluid from the atmosphere. a solenoid valve, controlled by the motronic, can open or close the airway.

    below 1100 rpm (i.e idle), the engine vibrations are not enough to force fluid from the top chamber, through the passageway to the bottom chamber. the airway is open (solenoid valve open). the rubber membrane creates a soft cushion which absorbs the high frequency vibrations.

    above 1100 rpm the soleniod valve is closed which blocks the airway and so "hardens" the mount (the fluid has nowhere to go). thus the mount is effectively solid.

    the high frequency vibrations at speed are absorbed by the membrane (as in the idle case), while the more damaging low frequency vibrations cause the fluid to force itself through the chamber in the plastic body to the lower chamber, forcing the (lower) rubber chamber to distort - effectively absorbing the vibrations.

    in this case i would suspect that the mounts are bad - possibly as simple as the connectors have been pulled off.

    I just took the solenoid mount out and replaced it with a standard non electric mount. I think a new mount is about £75 + vat from audi... try the connection 1st, you will see it on mount..
    #10

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