Mercruser 4.5 Bravo 3 Low Block pressure Alarm

[dogwspts]

It's back low block pressure alarm again to day on the way in .Boat ran great all day and then BEEEEP low block pressure. Has to be the sensor,,,Thoughts anyone is a damn shame boat has less than 50 hours.

[dogwspts]

Void

[Big Block Power]

What did you find? No voiding your own post. Lol

[AsLan7]

What did you find? No voiding your own post. Lol

.

Yes that’s a first.

[dogwspts]

Haven't found the problem for sure still think it might be a bad sensor.Waiting on a new one. Voided because I sent the same post twice...Sorry Guys.

[Big Block Power]

Haven't found the problem for sure still think it might be a bad sensor.Waiting on a new one. Voided because I sent the same post twice...Sorry Guys.

Your still in warranty right? Or too big of a hassle to get it to the dealer.

[dogwspts]

Hassle to dealer . Hope its just a sensor.

[dogwspts]

Wouldn't expect a new boat to act like this.

[dogwspts]

Did ok after changing sensor..Not sure what the normal block pressure should be on the Smart Gauge

[Big Block Power]

Let's hope that's it.

[dogwspts]

I hate to beat a dead horse this thing is crazy. I tried new sensor today ran great temp never above 150 .Block pressure 10 to 18 above 3500. After about 2 hours got alarm low block pressure showing about 5 psi on gauge went into limp mode . Happen a few more times at rpm Then ok block pressure never above 8 psi temp never above 150 . It’s racking my brain . 3 hours from any dealers.
.

[cmattj]

Well if your threshold is dropping after warm and going into guardian mode you may need to take it to a dealer.
They can scan it for true block water pressure to determine if it’s a communications fault incurring once your electrical is warm.
I wouldn’t think an impeller would give up and come back when cooler?!? Unless there’s some strange cavitation happening. Sounds like communication issues.
Make an appointment! It’s worth it

[ajcampen]

Call mercury customer service. They are great help. Sounds like dealer time. Does this happen on muffs? I had these issues caused by my fuel system last year. Doubt you have cool fuel module though which was my culpret

[dogwspts]

One more try No alarm to day but 2017 Mercruser 4.5. Bravo3 Getting a low block pressure alarm at high rpms. Dosent happen all the time. Changed to new sensor from Merc and it still happen. %0 hours on motor . Seems to mostly happen after engine is run for a while. I see readings as high at 20 and the they drop as the day goes on...

[ajcampen]

Found problem removed water sensor on back of engine cleaned it out and all is well. Did get a little dock rash today messed up the letters on starboard side.

You have a mercury warranty too. Consider going to a local mercury dealer and not cobalt bc of the 3 hour drive. With that policy they can bill mercury when they figure out the issue if it is engine driven