A week ago I while driving my 2007 bmw 530xi (after quickly passing another car) I stopped at a red light....as soon as I stopped I found the engine really shaking ...I pulled to the side turned the engine off and started it again and it seemed ok.I used a code reader and got error 29CE - Misfiring cylinder 2. I just changed (the car has 112k...I changed the sparkplugs, pre-cat sensors, ac belt and pulley recently) all the spark plugs, I think I have a bad ignition coil...the questions is ....do I need to change all the coils....does the resistance on the coils decrease/increase over time? Do you think I'd get better performance by changing all 6 coils?
Country: United StatesMake: BMWModel: 530xiYear: 2007Engine: v6
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just to confirm, there was only the miss in the one single cylinder? no other codes?
That is right ... No other codes
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okay, then if the plugs are new the coil is almost certainly the issue
you can replace just the one, you won't likely see a noticable/feelable improvement from doing all of them, but it certainly won't hurt
I hope that is helpful, please let me know if you have further questions, or if I can clarify anything for you.
Best wishes to you with your repair.
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thank you in advance.