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Thread: sudden CEL and rough idle

  1. #1
    Join Date
    Mar 2018
    Location
    Milford, CT
    Posts
    485
    My Cars
    03 540iA/16 435 F33

    sudden CEL and rough idle

    I have a 2003 540, a CEL came on yesterday when I started the car. Still on this morning and there is a rough idle, almost sounds like a low drum beat. Also noted, when accelerating, I hear the drum beat and some hesitation. I ordered the C501 scanner but wont be here until Friday. Any suggestions on were to start?

  2. #2
    Join Date
    May 2013
    Location
    Chicago, Illinois
    Posts
    928
    My Cars
    2000 BMW 528iA
    Take the car to AutoZone or another car parts retailer and ask them to check for codes. They offer that service for free. Report back what P codes are found.
    2000 528i sport
    EMP Stewart water pump
    Dice iPod adapter
    Alpine amplifiers
    MB Quart speakers
    MTX BGE12 subwoofer
    AudioControl EQL equalizer

  3. #3
    Join Date
    Mar 2018
    Location
    Milford, CT
    Posts
    485
    My Cars
    03 540iA/16 435 F33
    Pulled codes, at local shop appeared to be a bad coil pack. I forgot to get the code number. Replaced it last night car seem to be fine now.

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