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E38 740iL Power Steering

Discussion in '7 Series' started by koh_424, Nov 16, 2013.

  1. koh_424

    koh_424 Club Guest

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    When driving or turning for reverse, sometimes the steering feel very light. But sometimes it's feel heavy to turn it.Did anybody encounter this problem before?
     
  2. alantiong

    alantiong Club Guest

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    time to flush your fluids bro. i mean flush.. not just change
     
  3. koh_424

    koh_424 Club Guest

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    If flush it will the hose leak due to the age of it?
     
  4. alantiong

    alantiong Club Guest

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    why would it leak.. unless its time to replace hose... if its the original, its high time to change the hoses too.
     
  5. koh_424

    koh_424 Club Guest

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    I just worry after flush the oil wil cause it leak.

    Lets visit 'Bang John' next week & c how it's goes!

    Where are you now bro?
     
  6. E28driver

    E28driver Club Guest

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    Check your servotronic switch and / or general module.
     
  7. koh_424

    koh_424 Club Guest

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    Will try to check it up when meet up with mech.
     
  8. alantiong

    alantiong Club Guest

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    a rather stupid question to ask.. what to check on module?? how to check ah?? what to see ah?? enlighten please.

    - - - Updated - - -

    a rather stupid question to ask.. what to check on module?? how to check ah?? what to see ah?? enlighten please.
     
  9. E28driver

    E28driver Club Guest

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    Alan

    We all know you are the resident E38 guru lah so save the attitude.

    I'm just trying to be helpful to the OP.

    When I had a problem with heavy steering, it turned out that a frayed servotronic switch wire resulted in the GM111 module getting shorted. At least this is what the mech told me. One new servotronic switch and one replacement GMIII module (from chop shop) later and I had my PS back.

    Cheers
     
  10. koh_424

    koh_424 Club Guest

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    Have consult mechanic bout this matter.

    He told me it may cause by the pressure valve hose which the previous owner re-thread the hose instead of change a new hose.

    Next project will sort out this issue.
     
  11. alantiong

    alantiong Club Guest

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    bro, i think you have jumped the gun.. i was really asking a question as i have no idea what to look for when looking at a module unless there is a code..

    but since you have explained frayed switch wire.. so it all make sense..

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    bro, i think you have jumped the gun.. i was really asking a question as i have no idea what to look for when looking at a module unless there is a code..

    but since you have explained frayed switch wire.. so it all make sense..

     
  12. E28driver

    E28driver Club Guest

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    OK, my mishtake, all is good.
     
  13. koh_424

    koh_424 Club Guest

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    Been to Bomin Auto to flush the power steering fluid.

    Used 4L new oil to flush the system & clean the reservoir. Add in 1L new oil.

    Result = still heavy to turn.
     
  14. alantiong

    alantiong Club Guest

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    did they check is servotronic solenoid ? if that unit is stuck.. then it will be heavy too
     
  15. koh_424

    koh_424 Club Guest

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    Nope. They didn't diagnose my ride.

    Just flush the oil. And the foreman 'Seng' help look around for the any others leak.

    He also suggest i take out the steering box, pump & etc to do a repair on it.

    Advise?
     
  16. alantiong

    alantiong Club Guest

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    do check servotronic
     
  17. koh_424

    koh_424 Club Guest

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    Diagnose manage to detect it?
     
  18. alantiong

    alantiong Club Guest

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    see whether any power reach the unit. it may be module burnt. ask seng to call me when he check
     
  19. koh_424

    koh_424 Club Guest

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    Will arrange my time to drop by Bomin again.

    Thanks.
     
  20. koh_424

    koh_424 Club Guest

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    Problem solved.

    Changed steering box & servotronic switch.

    Now its back to normal!
     

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