06 240 Sundander backfiring between 2-4K RPMS

[06SEARAY240]

Good morning everyone,
I have a 06 sea ray sundancer 240 that backfires from 2-4K RPMS. Once I get on plain and above 4K RPMs boat runs awesome.. its a 5.7 350 engine..

I have changed:
Plugs
Wires
Cap & Rotor
Throttle Body as mine was corroded
TPS

Any help on a fix or if someone else has dealt with this is greatly appreciated.

Thanks
Greg

 

[Mark V]

Had similar backfire issue with my 2006 350 Mag MPI. Changed multiple things as you did, no luck, then fixed it by putting in a new crank angle sensor. Pulled mine, got the GM part number off of it then ordered from Amazon. Will look for the PN and post it later if I can find it.
On mine, there is also a rotor position sensor in the distributor, but changing that made no difference.

 

[Scott215]

That's makes sense. Strange it cuts out 2 k to 4 k. I hardly ever have my boat at 4,000 rpm

 

[Mark V]

This is what I ordered. Was about $60 on Amazon 2 years ago. The GM P/N matched mine, problem instantly went away after installing it, and has worked for about 85 engine hours since then. Good Luck, and please post whatever your solution turns out to be

 

[06SEARAY240]

This is what I ordered. Was about $60 on Amazon 2 years ago. The GM P/N matched mine, problem instantly went away after installing it, and has worked for about 85 engine hours since then. Good Luck, and please post whatever your solution turns out to be

I ordered one this weekend I will let you know if this fixes my problem. I also ordered the Mercruiser Vesselview to see if I am pulling any codes.. Thanks for the advise