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  1. #1
    Join Date
    Jul 2007
    Location
    Edmonton, AB, Canada
    Posts
    762
    My Cars
    91 850i, 07 Jeep SRT8

    2008 X5 4.8L Rough Idle + lots of codes

    The vehicle was fine all along. The other night was driving and it started running rough... Pulled over and restarted it and was fine..

    All these codes in the car even after resetting:

    P2187 - lean at idle bank 1
    P2189 - lean at idle bank 2
    P0300 - random / multiple misfire detected
    P0301 - Cylinder 1 misfire
    P0302 - Cylinder 2 misfire
    P0303 - Cylinder 3 misfire
    P0304 - Cylinder 4 misfire
    P0305 - Cylinder 5 misfire
    P0307 - Cylinder 7 misfire

    I looked around for vacuum leaks already and everything seems ok. There is however a small plastic tube not connected to anything by the driver side valve cover.
    CB01718 850i Lagunengruen Metallic / Silbergrau Leder

  2. #2
    Join Date
    Jan 2012
    Location
    Greeley, CO
    Posts
    337
    My Cars
    X5 E53 528i E39
    Check what you maf is reading, and that small plastic tube should be the breather hose for the front diff.
    E36 M3 95-sold
    E30 318i 91-sold
    E39 528i 00-rebuild at136K - sold
    E36 M3 98-sold
    E53 X5 4.4 05-the beast
    E53 X5 3.0 5M/T 01-sold
    R56 Mini Cooper S 07-sold I should have keept it
    E83 X3 3.0-the wife's
    E36 M3 97 - The new project - Sold

  3. #3
    Join Date
    Jul 2007
    Location
    Edmonton, AB, Canada
    Posts
    762
    My Cars
    91 850i, 07 Jeep SRT8
    The issue came back again. Seems like only happens in extreme cold. The MAF was getting around 9g/s at idle I think. About 30-60+ at wot.

    Should I try unplugging the MAF when it's idling rough?

    Same codes.

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