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Thread: bad running e39

  1. #1
    BMWHaus Contributor
    Join Date
    Aug 2013
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    831

    bad running e39

    well haven't used the car for a couple of weeks as was doing a few jobs on it when I had time,started it a while ago and it ran bad,would barely tick over and would drop to 500 rpm and cut out.have one of them cheap code readers whichsays p0505:idle air control system.is that idle control valve..car was running fine and I started it regularly but didn't drive it.is the icv hard to get at to clean or any ideas why for no reason its showing up.the eml light has come on as well and the orange triangle..all ive done to it lately is install new radio and im doing the brakes,,one pipe isn't connected but doubt that has any issue connected.any advice appreciated.

  2. #2
    BMWHaus Guru
    Join Date
    Jul 2013
    Posts
    2,554

    bad running e39

    Could be vacuum related


    Sent from my iPhone using Tapatalk

  3. #3
    BMWHaus Contributor
    Join Date
    Aug 2013
    Posts
    409

    RE: bad running e39

    As dave said could be a vacuum leak, if you have a look at the "y" shaped bellows from the air intake to the engine block below the disa valve that's where the idle control valve is, that particular bellows is also the one that cracks and causes the leaks. Removing both is an easy job Gar has a write up on the valve.

  4. #4
    BMWHaus Contributor
    Join Date
    Aug 2013
    Posts
    831

    RE: bad running e39

    Thanks lads.will check car tomorow

  5. #5
    Junior Member
    Join Date
    Mar 2015
    Posts
    29

    RE: bad running e39

    Smoke test. Simple... Find your vacuum leak in five ten mins

  6. #6
    BMWHaus Contributor
    Join Date
    Aug 2013
    Posts
    831

    RE: bad running e39

    the issue was camshaft position sensor...

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