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I think it was about 2.5-3 psi while idling.

No, I didn’t have the front inlets covered. I guess thsi could have let in air and cause reduced or erratic pressure.

I finally got a sea trial in with a new block pressure sensor and water pump. Got up to 10 psi at 3100 rpm. Too rough to go any faster, but it runs well now without going into guardian mode. Thanks...

I got a new block pressure sensor and new water pump installed. Now I get 0.8-1.2 PSI reading at idle on ear muffs. Next week, I’ll try to get it on the water for a real test....

I managed to get to the boat yard to take a look with DIACOM diagnostic software.

1. Shift switch seems to work fine, but it could be intermittent. Part still hasn't arrived yet.

2. With the...

Thanks EuropeanAM. It does seem like the Block Pressure sensor is the most likely culprit and/or the water pump. It will take me a few weeks to get to it, fix and test, but I will report back as soon...

Thanks SilverFox. I'll investigate the water pressure sensor as well.

After thinking more about my prop pitch of 17P, which I changed to because I was limited to 4800 RPM at WOT on a 19P. I now...

Thank you SilverFox and EuropeanAM for your advice.

If my next few attempts don't work, I will take this to a dealer. It will take me a few weeks to get the parts, install and do a trial run. I...

Thank you for the responses and apologies for the missing information. I've added my engine information to the top post and below.

The motor started with a 19P prop, but that kept me at 4800 RPM...

Hi, I’m new to this forum and have been scouring this forum and the service manual for help with this problem. Thank you in advance for what you’ve contributed and for helping with my issue described...