Need help! Mercury outboard coil questions

[BillieS]

Ok, I was spring tuning the pontoon boat over the weekend. Changed the plugs that look like they had a .090 gap. I do not think the guy ever changed them before me. Plugs burned evenly. Fired the engine up and had a miss to it. I norrowed it down to #3 cylinder. Engine ran great all year until the end of the season and acted as if it had a miss. So here I am looking at it now. I know it is the coil. Swap coils and the miss follows. Here in is the question.

I am being told that I must swap all coils out for the new ones. Do I really need to spend $600 for all new coils? Here is what I have:

2006 Mecury 60Hp EFI 4-Stroke Bigfoot 4Cyl Outboard
Serial#: 1C014899
Coil number: 879984, superceeded by 8M0077471

There is a service bulletin out on it. But I am wondering if there is any actual harm in replacing just the burned out coil pack. Thanks!

[Bamby]

It reads as if Mercury has had more than it's share if issues with coil packs for your engine. Yes there is a service bulletin on them and under it there was a real chance you could have had them all replaced for free. This technically expired 2/15 but who knows maybe they would still extend some help in some shape or form. Service Bulletin

[BillieS]

Thanks Bamby,

On your note, I just got off the phone with Mercury tech support. While they would not extend the warranty to cover a 9 year old boat he did confirm that there was nothing wrong with replacing one coil pack. Or some call them ECM. He verified the correct part number and it is: 8M0077471 that replaced the: 879984

He said that the reason they replaced all of them was due to a bad batch of them that was ran and it was easier to replace them all and have a happy customer. Better than replacing one then something happen and the customer having to come back for the same issue. Still beats $600