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Sorry you feel it that way. I appreciate all your input tried my best to reply and took your advises. "Replaced it all" - did you mean battery what @muc advised or TMAP again what you recommend. As mentioned is new and also verified against gauge.

I will appreciate if you tell me what was not right you noticed with o2 state and engine load? I guess I just dont know how should it work.

Thanks again for your time. Next Diacom recording I will get will be done with good battery. Guess if it will still drop below 11V I shoul check cables.

I did mention its alpha drive with 1.62 - standard for Bayliner VR5 with this engine. Now installed standard prop for this setup as I mentioned I get at 3000 and 4000 rpm exactly the same speeds like boat during test in magazine. So prop is what it has stamped same as gear ratio other way speed...

It doesn't? See attached screen at 2857rpm. Steady spark advance injectors for as long as rpm stays the same. Do you expect see anything more if its 2min or 5min?

Vacuum chart is in the manual and it's copy and paste since the beginning of the time just because its simple engine with OHV. That's what I think. It ain't diesel or any modern engine. Guess its there because is applicable. Fuel rail pressure also proves that its not in the range. And yes I...

Once agian thanks for your time and effort- much appreciated. Battery probably needs replacing but 10-10,5V voltage drop during cranking is acceptable relaying on many internet sources. You mention drop above 0.5V is bad. I will test battery anyway and if its OK then check electrical system...

Attached file with two latest recordings. Please feel free to comment if you notice something unusual

Hi everyone. Is someone here who has or can get Diacom recording for 4.5l 250HP Mercruiser? I would like to get them to compare with my engine. It's PCM112 ecu version

If you want you can install Diacom and check files. If free and it will work. I will appreciate another point of view.

I checked in service manual its a keyway.

I will do and hope will find it with your help guys

Took that sensor out earlier to check for potential dirt - I guess its magnetic. I will try with screw driver but will I see any movement if it slipped? Worth to try anyway

Unless you have the specs your ''ball park'' is guessing as well ;)

Can you tell from drawing below. I can't see key there. https://www.mercruiserparts.com/bam/subassemblydetail/51242484/28214545

I know fuel trims and, o2 target and o2 sensor response looks perfect. But what in the situation that the timing is wrong. What if fuel burns too late when piston already moves down and some of combustion goes out through exhaust valve opening to early. Will o2 sensor notice any difference? It...

Thought you noticed that I don't write like native. The only time theboat is connected to power here is to charge battery and regardless if its US or Europe it will always get proper DC supply from battery charger.

17-21"Hg probably some general info found online - sorry my bad. But there is page in service manual for this engine that specifies that. See attached. Only difference that it states normal as 15-21Hg. Did you see my fuel supply module checks? Fuel pressure is not in the proper range either not...

I'm not sure what timing should be as well as other things that's why started this post and asked for help with checking Diacom data. TMAP was verified - diacom readings vs physical gauge. Both show the same. Not sure why sea water temp is always 32F. This engine its Mercruiser own design and...

Thats correct. Not sure what's the logic of this PCM. Speed and density controlled. There is no IAC just throttle drive by wire. Guessing that PCM calculates air density from vacuum and temperature (TMAP sensor) and adjusts injector pulses to keep stichometrtic ratio. How does the RPM stay...