Hi all,
Looking for some guidance on a friend's boat I am helping out with:
2003 Volvo Penta 5.0 GXi-C
Early last year had a fuel pump failure, replaced the fuel pump and all was good most of the season.
At the end of last season he ran in from a storm, the boat ran well. Later that evening he went out for a cruise and could not yet on plane.
Power Loss/ no power at WOT will not plane
WOT starts to get up but will not get high enough RPM for planing out just sucking air.
Compression 148-160 on all cylinders
Since they were older and maintenance items we replaced: Plugs, cap, rotor wires. I also took a look at the fuel filter and looked ok.
Fuel pressure ~55, low pressure ~15 at idle (I did not check yet at WOT under load, but will if we launch this again in the next couple days)
No engine codes
I pulled the fuel pressure regulator and had a few particles in it, I cleaned it out but didn't make a difference.
I saw the service bulletin from VP saying to remove the filter and place an e-clip, I will try to get a clip from the local dealer. I do not feel this is my issue but I guess its possible.
I do not have a scanner to get sensor readings. Any recommendations on a DIY tool?
~650 hours on the engine
While out previously I disconnected the oil pressure sensor and then the coolant temp sensor and exhaust sensors and no change in performance. No knocking, pinging, rattling, just the sound of a wide-open throttle sucking massive amounts of air and giving no power in return.
Runs great with no load/on the trailer on muffs.
I pulled the plugs tonight.
Plugs 1,3,5,7 are very very clean (too clean but only about 20 mins of run time)
Plugs 2,4 heavy carbon, 6 less carbon, 8 very clean
Any ideas on what to go after next? Could weak spark by a failing coil cause odd cylinder firing like this under load?
Thanks much, any advice is appreciated.
Looking for some guidance on a friend's boat I am helping out with:
2003 Volvo Penta 5.0 GXi-C
Early last year had a fuel pump failure, replaced the fuel pump and all was good most of the season.
At the end of last season he ran in from a storm, the boat ran well. Later that evening he went out for a cruise and could not yet on plane.
Power Loss/ no power at WOT will not plane
WOT starts to get up but will not get high enough RPM for planing out just sucking air.
Compression 148-160 on all cylinders
Since they were older and maintenance items we replaced: Plugs, cap, rotor wires. I also took a look at the fuel filter and looked ok.
Fuel pressure ~55, low pressure ~15 at idle (I did not check yet at WOT under load, but will if we launch this again in the next couple days)
No engine codes
I pulled the fuel pressure regulator and had a few particles in it, I cleaned it out but didn't make a difference.
I saw the service bulletin from VP saying to remove the filter and place an e-clip, I will try to get a clip from the local dealer. I do not feel this is my issue but I guess its possible.
I do not have a scanner to get sensor readings. Any recommendations on a DIY tool?
~650 hours on the engine
While out previously I disconnected the oil pressure sensor and then the coolant temp sensor and exhaust sensors and no change in performance. No knocking, pinging, rattling, just the sound of a wide-open throttle sucking massive amounts of air and giving no power in return.
Runs great with no load/on the trailer on muffs.
I pulled the plugs tonight.
Plugs 1,3,5,7 are very very clean (too clean but only about 20 mins of run time)
Plugs 2,4 heavy carbon, 6 less carbon, 8 very clean
Any ideas on what to go after next? Could weak spark by a failing coil cause odd cylinder firing like this under load?
Thanks much, any advice is appreciated.
