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Thread: Strange Rough idle issue

  1. #1
    Join Date
    Mar 2013
    Location
    Savannah, GA
    Posts
    69
    My Cars
    2008 BMW 328i Sedan

    Strange Rough idle issue

    In have a 2008 BMW 328i N52 engine with about 118k on the motor. I replaced the plugs at 100k and thermostat at 105k. I知 having an issue with my Crankshaft position sensor (failing slowly) after an attempted replacment (the new sensor wouldn稚 register) i put the old one back in so i get the standard SES light. Also my fwd upper o2 sensor is failing. Just wanted to give a back story

    currently every now and again i start the car and it runs like crap when its idling, but the second i turn it off even if it is not warm it is completely fine no issues with the idle. It has me baffled so I知 curious to know if you thinks its just crankshaft sensor issue or maybe something else going on. I under stand there are 2 major issues the fwd upper 02 sensor and the crank sensor but I知 just curious if this has happened to any other person

  2. #2
    Join Date
    Jan 2016
    Location
    Ca
    Posts
    6,981
    My Cars
    2001 525it
    We did a crank sensor and we updated the eye level(the newest software) using ista, this may help

  3. #3
    Join Date
    Mar 2013
    Location
    Savannah, GA
    Posts
    69
    My Cars
    2008 BMW 328i Sedan
    I miss not sure what ista is, I have ncsexpert, and all the other standard factory and dealer software. Is this something you that is hard to do?

  4. #4
    Join Date
    Dec 2012
    Location
    North Carolina
    Posts
    1,450
    My Cars
    2009 335i M-Sport Coupe
    You need ISTA-P and an ICOM if you want to update the integration level (i-level). Definitely replace that crank sensor.

  5. #5
    Join Date
    Jan 2006
    Location
    Seattle, WA & Bulgaria
    Posts
    3,339
    My Cars
    1992 750iL highline
    If you have INPA or ISTA, check for fault codes first - they may give you additional info.

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