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MWJ68

2015 23 LSV Vibration

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MWJ68
Posted (edited)

2015 23 LSV:

First day on the water this year.

Engine starts and sounds great. However, I notice a vibration between 1500 and 2000 rpm with the boat in gear. In neutral I feel no vibration. So its either the engine under load or something else. Prop looks great and I haven't hit anything. 1/2 of the tank is fresh fuel. The other half is last years tank with fuel stabilizer.

Second point, I swear the exhaust smells stronger this year and has an odor of unburned gasoline. 

Third factor, I was idling the engine in neutral and running the RPMs up the check the engine temp. While I was doing this I got a service required message: O2AFuelTrimLong DATA VALID BUT ABOVE NORMAL

SPN:4237 FML:0

I had this game message last season. Found the O2 sensors on the CATS were only finger tight. I secured them and never saw the message again. Until today.

Engine is L96 410

At first I was thinking it was a missing cylinder. However, I think if the cylinder was not firing it would sound really rough at idle. Not the case. Runs smooth in idle and revving rpm in neutral.

Smell of gas in exhaust lead me to think I had a cylinder not firing though.

All three factors may be separate issues. The vibration isn't bad. My other family members didn't even notice it until I pointed it out. 

Perhaps a Drive issue? But that wouldn't explain the gas smell.

I hate to take the boat to the shop (Im sure backlog is 3 weeks) for something that I wonder is my imagination.

Thought?

TIA,

MJ

Edited by MWJ68
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MWJ68

Correction:

I checked my past post. Found that the O2 sensor issue was different than todays.

Last year it was:  O2BFuelTrimLong DATA VALID BUT BELOW NORMAL

Tightened the O2 sensors and the problem didn't recur. 

That was last year.

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Ballay

Bad injector?

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Malibuwrench

Indmar came out with a better o2 for 6.0 boats. That’s a place to start. Also it’s worth pulling the o2s and checking for moistures. Those tube 6.0 headers are common for cracking and leaking water

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