[aquaknot]

anyone know the spark plug size for my 1999 7.4L MPI. The boat is 1.5 hr away and I want to replace the plugs this weekend (forgot to check last weekend). Also, I've had an issue starting the engine since the spring launch, just a click from the starter, replaced the starter and the same thing, checked and remade all the connections I could find, same trouble. Only seems to happen when the boat engine is cold. After she's been running for a while, no problem. Also, if I hold the key after the click, she will eventually turn over. Any advice would be great

[team1marine]

I just went through this with my 2000 7.4 MPI. There is alot of mis-informatoin out there. You want the OEM reach .708
Recommend AC MR43LTS or NGK BPR6EFS

[ShabahZ280]

x 2 on NGK BPR6EFS

[aquaknot]

thanks..........on my way to purchase them