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Thread: Ignition coil reality check please

  1. #1
    Join Date
    Mar 2013
    Location
    Alpharetta
    Posts
    113
    My Cars
    1998 z3

    Ignition coil reality check please

    Wife’s Z4 3.0si ran really rough yesterday, a bit of a noise etc. Code checker shows cylinder5 misfire. Swapped the coils between cyl 5 and cyl 2 to test and the misfire code wandered to cyl 2. Great! Simple coil swap right? But, getting Cyl 4 misfire now after putting a new Bosch coil in cyl 5.

    Ran rough after swapping cyl 5 coil.

    I will pull at least the cyl 5 spark plug and look for clues later.

    Thoughts please?


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  2. #2
    Join Date
    Oct 2021
    Location
    Toronto
    Posts
    10
    My Cars
    2008 Z4MC
    It might be time to change all of them for fresh coils, at least you eliminate that from the equation.

  3. #3
    Join Date
    Jan 2008
    Location
    Arida Zona
    Posts
    30,108
    My Cars
    z3
    I never replace coils one by one. If one is bad, I replace them all together

    May as well do spark plugs too. They are both part of the ignition system after all.

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