FastMarkA
Active Member
My 2011 350 MAGs love to kick out the dreaded VesselView error code: Engine Mis-Fire. This is a code that can only be reset with the highly coveted MerCruiser tech software.
This started at the beginning of the season (May 1). The boat had 95 hours on it when I took possession, and the first error code spit out around 100 hours.
I had a tech reset the alarm to see if it'd happen again. After probably 10-15 hours, it resurfaced. Within an hour of the other, both engines were now allegedly mis-firing, but their performance was fine.
So again, I invited the mechanic to check things out. No additional data was gained when the laptop was plugged into the OBD. One more time, we reset the code because from all indications, the engines were running beautifully...idle was nice, and WOT 5200 RPM got around 53mph.
After about a month, mis-fire codes for both resurfaced. So I had a tune-up done, and indeed the caps were a little ugly after 3 years (fresh water only). So new plugs, new caps, new rotors, oil changes, oil filter changes, fuel filter changes, and impeller replacements. Wires were not changed since they looked to be in great shape, per the mechanic.
In doing this work, it was observed that the plastic tab to which the distributor cap screws into was broken, so distributors were replaced on both engines.
About 2 weeks after the work, poof...mis-fire codes again for both engines. But they're running even nicer than they were before...5200 RPM happens with no problems.
I've done some research, and I'm seeing a lot about the oxygen sensors and how a faulty one of those can cause the engine to mis-fire. With the tune-up work done, and both engines performing beautifully, I really am starting to think this is a sensor failure issue and that the engines are just fine?
Curious if anybody has had a similar experience and, if so, how it was remedied. All I want is to have a green "OK" dot on the top left of my VesselView.
TIA!
This started at the beginning of the season (May 1). The boat had 95 hours on it when I took possession, and the first error code spit out around 100 hours.
I had a tech reset the alarm to see if it'd happen again. After probably 10-15 hours, it resurfaced. Within an hour of the other, both engines were now allegedly mis-firing, but their performance was fine.
So again, I invited the mechanic to check things out. No additional data was gained when the laptop was plugged into the OBD. One more time, we reset the code because from all indications, the engines were running beautifully...idle was nice, and WOT 5200 RPM got around 53mph.
After about a month, mis-fire codes for both resurfaced. So I had a tune-up done, and indeed the caps were a little ugly after 3 years (fresh water only). So new plugs, new caps, new rotors, oil changes, oil filter changes, fuel filter changes, and impeller replacements. Wires were not changed since they looked to be in great shape, per the mechanic.
In doing this work, it was observed that the plastic tab to which the distributor cap screws into was broken, so distributors were replaced on both engines.
About 2 weeks after the work, poof...mis-fire codes again for both engines. But they're running even nicer than they were before...5200 RPM happens with no problems.
I've done some research, and I'm seeing a lot about the oxygen sensors and how a faulty one of those can cause the engine to mis-fire. With the tune-up work done, and both engines performing beautifully, I really am starting to think this is a sensor failure issue and that the engines are just fine?
Curious if anybody has had a similar experience and, if so, how it was remedied. All I want is to have a green "OK" dot on the top left of my VesselView.
TIA!
