Volvo Penta 5.7 no power

[mkor]

Continuing to my previous repair with looking for a spark, now I have a spark, the motor is running. But today I couldn't get into planning mode. I do not have enough power, for some time I was looking for the cause in the wave and the tidal current, but no, this is a mistake.

So, I give full throttle, the boat accelerates to 12 knots and cannot get into planing mode. Turnovers of 2800 and above do not rise, but if I turn off the gear, then I calmly spin the engine to the maximum. I dived, nothing was wound up, the propeller is spinning by hand in neutral, the bottom is practically not overgrown.

I think the problem is the loss of power, I do not know what is connected with.
I started to listen and it seemed to me that the engine troit.
I removed the spark plugs and they look good. I found 2 wires under the cap which had small traces of corrosion, cleaned them.

Until the problem is solved, any ideas?

 

[Scott Danforth]

What are your compression numbers?

What trouble shooting steps have you taken?

Is this a new problem? Or a new to you boat ?

 

[dubs283]

If you have spark and the engine runs although poorly especially under load you should inspect the fuel delivery system

Filters, fuel pump(s), supply, etc...

Have you confirmed ignition tune up/spec?

 

[jimmbo]

Carb or FI, electronic, or mechanical Spark Advance?

 

[Donald0039]

Gas, filters, anti-siphon valve, fuel pickup.

 

[mkor]

And so, a little background, for 2 years of owning a boat this happened for the first time. At first I lost power even at idle, but the problem was in the high pressure pump. I changed it and immediately went to the glider. True, I periodically added speed or disappeared and the engine worked intermittently. It didn't happen last season. I don't know which manufacturer I bought the pump, but it's not original. I measured the pressure on low and high. Low 11 and drops if you do not start the engine, high 48 + -1 and stableю If you add speed, the pressure of the injection pump dropped to 46.

If you turn off the engine for 2 hours, the pressure does not drop.

If you set 1200 rpm and the speed starts to float, I see how the monometer needle floats by 1-2mm.

Checked the anti-siphon valve, it opens well.

I have nothing to measure compression.

From the rest, replaced:
Throttle position sensor
Ignition coil
ignition module
Distributor with cover, rotor and sensor

Idling is excellent.
Low revs from 1000 to 1500 - revs float, as if the engine is troiting.
RPMs above 1500 without load are fine.
An attempt to get into the glider - 2800 rpm and 12 knots, no more.

 

[mkor]

I took pressure again today and made a video.
My book says normal high pressure is 50-60, mine is slightly lower. At the same time, they write about 45psi on the forums.