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Thread: 325i Valvetronic issue

  1. #1
    Join Date
    Sep 2017
    Location
    Europe
    Posts
    6
    My Cars
    325i

    325i Valvetronic issue

    Hi,

    I have 325i with n52 engine and problem I have is rough idle and low power at low rpm. There are no error codes stored. But problem goes away when I unplug eccentric shaft sensor. So I looked in ISTA/D live data for valvetronic and it says:
    eccentric shaft actual angle 23 degrees
    eccentric shaft specified angle 29 degrees
    Is this normal or should numbers be the same?
    I already changed valvetronic motor and vanos soleonid and nothing changes.

    Thank you for your help.

  2. #2
    Join Date
    Dec 2012
    Location
    North Carolina
    Posts
    1,450
    My Cars
    2009 335i M-Sport Coupe
    I believe there is a calibration in ISTA where the valvetronic motor learns the upper and lower tolerance. You might need to calibrate it so it reaches the set-point. It might be under service functions.

  3. #3
    Join Date
    Sep 2017
    Location
    Europe
    Posts
    6
    My Cars
    325i
    I already calibrated valvetronic motor and nothing changed. Could it be bad eccentric shaft sensor? Only thing that baffles me, that there are no error codes.

  4. #4
    Join Date
    Sep 2017
    Location
    Europe
    Posts
    6
    My Cars
    325i
    Is there anything else I can check before I change eccentric shaft sensor?

  5. #5
    Join Date
    Dec 2012
    Location
    North Carolina
    Posts
    1,450
    My Cars
    2009 335i M-Sport Coupe
    It's odd that you have no error codes, but I've heard of failed eccentric shaft sensors that did not trigger a code. Replacing that seems to be the next logical step. I'm told that the off-brand sensors don't work.

  6. #6
    Join Date
    Sep 2017
    Location
    Europe
    Posts
    6
    My Cars
    325i
    Ok I will replace sensor. Thank you for your help.

  7. #7
    Join Date
    Jan 2016
    Location
    Ca
    Posts
    6,981
    My Cars
    2001 525it
    Look for oil in the electrical comnector

  8. #8
    Join Date
    Feb 2017
    Location
    Metairie, LA
    Posts
    596
    My Cars
    2001 325i; 2006 325i
    Yes, look for oil in the connector socket. When my eccentric shaft sensor was bad, I didn't get any codes either. It must have been bad when I bought the car because it had a good bit more power than I knew it to have after the repair.

  9. #9
    Join Date
    Sep 2017
    Location
    Europe
    Posts
    6
    My Cars
    325i
    I checked today for oil in connecter socket and there was a little oil in it. I'm going to replace sensor and hope for the best. Thanks for your help.

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