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Listen to the difference in sound between a proper working coil pack vs a faulty coil pack when they make spark.
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They all blinked the same to me, how can you tell which one is misfiring ?
It’s the third one he tests. The flash seems sporadic and weak at times. The other three seem fine, for the most part. Though that first coil pack seems like it might be on its way out, too.
What if it’s the spark plug that’s bad?
i’d rather do the manual check,
more consistent in result than that one
That method doesn’t tell which sparkplug is misfiring.