Review on Inboard Ignition Coil Replacement for MerCruiser Thunderbolt IV and V Ignition Systems with HEI - Replacing 18-5438, 392-805570A2, 392-7803A4, 392-805570A1, 72115, 40511 by Jeff Sorensen
misfires! Cheap and bad
These coils will cause intermittent misfires in your engine. I had 1 bad coil but decided to swap the right and left motors. Approximately every 2-5 minutes the engines die and misfires occur. Sometimes so bad that they ignite unburned fuel through the air intake. Garbage. Buy a well-known brand so your boat doesn't explode.
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