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BMW E39 525i Rough Idle

  • 15-01-2015 1:54am
    #1
    Foxhole Norman
    Registered Users, Registered Users 2 Posts: 5,875 ✭✭✭


    Hey lads, my E39 M54 has a rough idle when it is dead cold. It shakes a bit while the rpm goes down from around 900-600. Already replaced the ignition coil that caused a misfire in cylinder 6 but the shaking continues.

    It only happens for about 20/30 seconds until it is somewhat hotter. Perfect other than that, any ideas?


Comments

  • #2
    Stheno
    Moderators, Business & Finance Moderators, Science, Health & Environment Moderators, Society & Culture Moderators Posts: 51,690 Mod ✭✭✭✭Stheno


    cam shaft sensor?


  • #3
    Foxhole Norman
    Registered Users, Registered Users 2 Posts: 5,875 ✭✭✭Foxhole Norman


    Stheno wrote: »
    cam shaft sensor?

    AFAIK that would throw a code and there was no codes at all bar the ignition coil, the shuddering very light and not as heavy as you'd expect from a faulty shaft sensor.

    I should also mention, all power is there, shifts well and the MPG is good.


  • #4
    discodavie
    Registered Users, Registered Users 2 Posts: 341 ✭✭discodavie


    Foxhole Norman wrote: »
    AFAIK that would throw a code and there was no codes at all bar the ignition coil, the shuddering very light and not as heavy as you'd expect from a faulty shaft sensor.

    I should also mention, all power is there, shifts well and the MPG is good.

    What are you scanning it with ?
    Can you get live data with it ?


  • #5
    Foxhole Norman
    Registered Users, Registered Users 2 Posts: 5,875 ✭✭✭Foxhole Norman


    discodavie wrote: »
    What are you scanning it with ?
    Can you get live data with it ?

    It was scanned with INPA last week and yeah it could get live data. Not sure when I can get it plugged in next.


  • #6
    Andrew_Doran
    Registered Users, Registered Users 2 Posts: 227 ✭✭Andrew_Doran


    That's a common complaint on E46/E39 forums. It may well be something else but the M54 is known to suffer from clogged hydraulic tappets which have the potential to cause this.

    http://forum.e46fanatics.com/showthread.php?t=913207&highlight=


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  • #7
    enumbers
    Registered Users, Registered Users 2 Posts: 552 ✭✭✭enumbers


    I would be looking for air leaks in breather system or failing breather valve


  • #8
    Foxhole Norman
    Registered Users, Registered Users 2 Posts: 5,875 ✭✭✭Foxhole Norman


    Quick update to this, it's still occuring with no error codes thrown, replaced the intake boot as the old one was in bits. There's a faint whistle upon acceleration too.


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