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Thread: Cold start rough idle 645 Ci

  1. #1
    Join Date
    Nov 2020
    Location
    Czech Republic
    Posts
    1
    My Cars
    BMW 645Ci

    Cold start rough idle 645 Ci

    Hello guys, i have a problem with my 645Ci 2004, when i start car in the morning i have a rough idling, rpm going up and down engine shaking, and engine check light on, when i pull a gas sometimes, turn engine off and back on its ok, i have new spark plugs and coil pack. On diagnostic iam getting error mysfiring cylinders:

    00274E - CDKMD - misfire detection, error sum
    00272D - CDKRKAT2 - LR adaptation additive per time (bank 2)
    00272C - CDKRKAT - LR adaptation additive per time
    0027B8 - CDKPDDSS - plausibility differential pressure sensor
    002772 - CDKTEVE - activation tank valveation valve
    002746 - CDKMD04 - misfire detection cylinder 6
    002749 - CDKMD07 - misfire detection cylinder 2
    CDKMD03 - misfire detection cylinder 8

    Sorry for my english, iam from Czech Republic
    Last edited by michaelplch; 11-13-2020 at 05:15 PM.

  2. #2
    Join Date
    Jan 2007
    Location
    .
    Posts
    7,708
    My Cars
    .
    Sounds like a vacuum leak. Performing a smoke test of the induction system can help, but it requires a special smoke machine and the proper adapters to perform it properly.
    ASE and BMW Master Certified Technician

  3. #3
    Join Date
    Jan 2016
    Location
    Ca
    Posts
    6,981
    My Cars
    2001 525it
    Yup

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