The Mariah Owners Club

The Mariah Owners Club (http://www.mariahownersclub.com/forum/)

- Original Mariah Talk (http://www.mariahownersclub.com/forum/original-mariah-talk/)

- - spark plugs (http://www.mariahownersclub.com/forum/original-mariah-talk/4736-spark-plugs.html)

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

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

x 2 on NGK BPR6EFS :wink_thumbup:

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