Misfire cylinder 3 & 5

[Edo88]

Are the stock plugs iridium or platinum?



Sent from my iPhone using Tapatalk

I’m headed to storage now to remove one and see what the part number is I’ll update with factory part number and ngk


Sent from my iPhone using Tapatalk

[Edo88]

platinum

The coils are ford as well but they spray painted the part numbers so hard to read


Sent from my iPhone using Tapatalk

[larry_arizona]

Motorcraft SP526 and CYFS12FP are same plug.

Again, $4.05 each on Amazon

Here are all the rock auto equivalent plugs.

Factory are double platinums.




Factory coils are Denso’s and $58 each on Rockauto

Sent from my iPhone using Tapatalk

[1967Goat]

Ford broke the cylinder labeling rule. Lol
They label theirs 1-4 on one side 5-8 on the other.
So if you’re looking at the engine from the swim deck (cus that’s closest to the front of the motor) 1-4 is on the right side.

Ford:
8 4
7 3
6 2
5 1

GM and everyone else in the known universe:
8 7
6 5
4 3
2 1

Are you sure about this? I am relatively new to boats, but was an automaobile mechanic for several years. Ford cars always numbered 1 - 4 on the PASSENGER side of the car. If you were standing on the swim platform, looking at the front of the engine, it would be
4 8
3 7
2 6
1 5

[larry_arizona]

I do better with pictures




Sent from my iPhone using Tapatalk

[MJHSupra]

I see a pic of home plate


Sent from my iPhone using Tapatalk

[larry_arizona]

I see a pic of home plate


Sent from my iPhone using Tapatalk

Lol, straight off Indmar’s site.......




Sent from my iPhone using Tapatalk

[Broke Pilot]

Are you sure about this? I am relatively new to boats, but was an automaobile mechanic for several years. Ford cars always numbered 1 - 4 on the PASSENGER side of the car. If you were standing on the swim platform, looking at the front of the engine, it would be
4 8
3 7
2 6
1 5

Yep you’re right... I was thinking of the GM motor to show the difference and put cylinders 1 on the same side. Good catch, lol

[Edo88]

Got the plugs replaced today looks like someone did a half azz replacement before already, had two different plugs in it


Sent from my iPhone using Tapatalk

[larry_arizona]

What plugs were in cylinders 3 and 5?


Sent from my iPhone using Tapatalk