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Running issue with 2008 BF225 with 1000 hours.

Thanks. I have cleaned the screen on the IAC valve and the fire screen in the air intake box. The issue must be engine temperature related. I can rev up the engine and let it idle at high RPM (> 1500) for a while. Then the engine won't "stall" after that. I will hook up my diagnostic tool with the engine running next time to see if there is anything out of ordinary.
 
Have you checked valve clearance, they are very critical to achieve a smooth idle. As Janz said too, O2 sensor can be getting old. doesn't always log a fault code. There's nothing to beat getting proper diagnostics, there more to diagnosing an issue than pulling codes. You also need a good understanding of sensor values, you can have a sensor sending an incorrect value without logging a fault. You've done very well so far.
 
Thank you for the reply. I will take a look at the O2 sensor values while the engine is running. A valve adjustment job is planned for this winter. So far I am happy with the engine. It is a 2008 engine with 1050 hours on it. I had it for 9 years and it has been good to me.
 
The war is over in my mind, by skirmishes still happens. I am documenting this for my own records and solicit opinions.

- Engine still stalls when idle at low RPM and cold. Engine will start at around 1000RPM. After 10 - 20 seconds, RPM will drop. If engine is "cold", the engine will "stall". If engine is warm, it will "recover" from the low RPM and start to idle around 800RPM. Suspect it is IAC related.

- Occasionally engine will give alarm when running around 2000-3000RPM and stutters. Shut engine off and start again, engine will be running fine. Pulled code 14-1 which is IAC related. Need to do more research and diagnostic on IAC valve. Is it expensive to replace IAC?

- When engine idle at low RPM <1000, battery light will come on and alarm goes off. Once RPM goes above 1000 RPM, alarm goes away. Suspect weak alternator. Will check and replace/fix alternator at end of season if necessary.

- There is a very small gas leak. Strong gas smell from time to time and show a film of gas on water. Need to check all gas connections and tighten gas filters.

Going to enjoy the season and try to fix issues at the end of season. A boat will never run at 100%. There is always an issue here and there.
 
A fuel leak can allow air into the fuel system, that will cause lots of running issues at idle and all the way through the rpm range. Plus gas fumes are very volatile, you might blow up. Could it be a fuel tank leak- pressure test it. You only need to apply say 2 lbs of air pressure.

An unstable idle can also be a sign of the need to adjust the valves.
 
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