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Thread: 08 BMW 535XI multiple cylinder misfire.

  1. #1
    Join Date
    Apr 2019
    Location
    New York
    Posts
    2
    My Cars
    08 BMW 535XI

    08 BMW 535XI multiple cylinder misfire.

    I have a 08 535XI.
    I'm having misfires in all cylinders at random it's not at any specific time either but it usually won't happen in low range or high range I could put the pedal to the metal and go from 40 to 160 and not have a single hiccup but if I do it at like half throttle I get hiccups I've gotten the fuel pressure notification on the infotainment center I brought it to mechanic who said it might just be a sensor the injectors were done on the car less than 5K ago. I don't think it's the spark plugs or coil packs because it's at random different cylinders every time. I was told that an ECU flash might fix my issue but I'm not a hundred percent sure I'm going to attempt mhd stage one flash tomorrow to see if that helps I have no warranty so I'm not voiding anything. I have a muffler delete but I don't think that would cause misfires I really don't know what to do at this point.

    Sorry for the format I'm on mobile and I'm using talk to text

  2. #2
    Join Date
    Jan 2016
    Location
    Ca
    Posts
    6,981
    My Cars
    2001 525it
    Don't down play spark plugs there changed every 45k and what are the faults

  3. #3
    Join Date
    Jun 2005
    Location
    New England
    Posts
    25,402
    My Cars
    F90 M5; E36 M3 Turbo
    I had issues at full throttle on my 08 535xi. Changed the coils. Happened after I installed a JB4. The extra boost increased cylinder pressure and that required a hotter spark.

    Have you ever cleaned the goo out of your intake runners and walnut blasted the remaining carbon?

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