Ignition Coil Differences

Discussion in '2nd Generation: 2007+ R55 through R61' started by InstrumentOfPeace, Jan 11, 2020.

  1. InstrumentOfPeace

    InstrumentOfPeace Active Member
    Supporting Member

    Jan 10, 2020
    106
    68
    28
    Male
    Ratings:
    +85 / 0 / -0
    #1 InstrumentOfPeace, Jan 11, 2020
    Last edited: Jan 11, 2020
    Purchased used a few months back. During the course of troubleshooting a misfire (waiting for spark plugs now) I pulled my ignition coils and one of these kids is not like the other.
    Then this morning I snagged 4 from a pick-your-part yard.
    Mine: 2013 Roadster S
    Pick: 2012 Cooper S

    The top row are the ones I picked from the yard (2012 S) The bottom row (with the mismatched 1) is from my vehicle (2013 S)

    Other than the top are Bosche the others are Delphi, anyone know the differences? Can I use the Bosch?

    belay, believe I figured it out. One of them are performance coils the other standard.
     

    Attached Files:

  2. MCS02

    MCS02 Moderator
    Staff Member Articles Moderator Supporting Member

    Jul 31, 2009
    9,944
    5,371
    113
    Male
    Ratings:
    +6,360 / 9 / -2
    I see your problem, it’s plane as day, the coil packs go in those holes not on top of the motor!:D

    The Bosh should be fine.
     
    • Funny Funny x 1
    • Winner Winner x 1
    • List
  3. Qik

    Qik Well-Known Member

    Oct 27, 2015
    1,415
    651
    113
    IT
    Atlanta-ish
    Ratings:
    +791 / 0 / -0
    The plugs and coils can both cause a misfire. I recently had a misfire and it was due to plugs which need to be changed every 60k in an R56 S. If the coils haven't been replaced they'll likely need to be changed. I'd advise against buying used coils for a Prince engine, they don't really last all that long to begin with. Maybe 60-75k? I don't know the recommended interval but when one goes the rest will follow shortly after. Anything OE spec rated should be fine. I have a 12 S and my coils look like that bottom row not those lighter gray ones on top.
     
    • Like Like x 1
    • Informative Informative x 1
    • List
  4. InstrumentOfPeace

    InstrumentOfPeace Active Member
    Supporting Member

    Jan 10, 2020
    106
    68
    28
    Male
    Ratings:
    +85 / 0 / -0
    Ha! Dude I so laughed out loud. So the spark plugs I ordered weren’t scheduled to be in until Monday. Said feck it, spent the cash at the dealership (ugh) but I prefer to stay in the solution... spark plugs were fine it was the coils.
    Threw those Bosch coils in and now I can’t even tell the engine is running. Fires, from a dead stop, with zero hesitation.
    All in all $330 spent (Plugs, picked parts, gas) and I have a spare set of spark plugs, a few spare coils, and a manifold I’m gonna clean up to use as a walnut blaster attachment.
     
  5. InstrumentOfPeace

    InstrumentOfPeace Active Member
    Supporting Member

    Jan 10, 2020
    106
    68
    28
    Male
    Ratings:
    +85 / 0 / -0
    Thank Qik. I’ll keep this in mind since I just put used ones on. I’ve been driving her for 3 months and noticed the engine (car) shake as time went by. Seems when they go it’s a slow burn until they quit.
     
  6. Jeff10049

    Jeff10049 Member

    Nov 24, 2019
    41
    58
    18
    Male
    Ratings:
    +76 / 0 / -0
    Interesting I have not really noticed a time/mileage limit or consecutive failures we often replace one bad with a single new and the others last years.
    I'm not dismissing what you see I wonder if cars in hotter or more humid climates have higher failures than here in central Oregon or some people just waiting too long to change plugs and that stresses the coils. My advice has normally been to just replace the failed coil but maybe my advice should take into account local climate and tune-up history.
     
  7. Qik

    Qik Well-Known Member

    Oct 27, 2015
    1,415
    651
    113
    IT
    Atlanta-ish
    Ratings:
    +791 / 0 / -0
    I noticed mine had a slight stutter or stumble under hard acceleration but no CEL. Pulled the plugs and noticed plug 4 had a worn electrode. Swapped out the plugs and the issue was gone. When the coils go you'll get a CEL and the engine will run rough and the car will sound like a WRX.
     

Share This Page