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  1. #1
    Join Date
    Jan 2011
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    Sunnyvale, CA
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    4
    My Cars
    1993 BMW 325ic

    Low compression / rough idle - E53 X5 4.6is

    Hi there,

    I'm quite new here on this forum - thanks much for any tips, comments or advice in advance.

    Timing chain and guides have been replaced on our 2002 X5 4.6is less than 100 miles ago. When starting the car in the morning last week, it had a very rough idle, but engine was running sort of fine at higher rpms. We spent significant time searching for the problem and checked all vacuum hoses connections, sensors, ignition components, etc. but couldn't find a problem. We then checked compression and found that bank 2 (driver side) had low compression in all 4 cylinders. We are suspecting a problem with the variable valve timing system (valves off cycle / not closing completely), since it's quite unusual for all four cylinders on just one side of the engine to have low compression from wear & tear.

    Did anyone experience a similar problem in the past and can confirm that a problem with the VANOS system might be causing this?

    Any other ideas?

    Thanks much in advance.

  2. #2
    Join Date
    Apr 2010
    Location
    West Palm Beach
    Posts
    1,825
    My Cars
    F31 MSport
    better luck on getting a definitive answer over on xoutpost
    2016 328ix | Wagon | M-Sport | Alpine White | Black | iND | 513M | AC Schnizter | MPerformance |
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  3. #3
    Join Date
    Jan 2011
    Location
    Sunnyvale, CA
    Posts
    4
    My Cars
    1993 BMW 325ic
    Thanks for the tip - just asked on Xoutpost as well.

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