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Good Evening,
I have read many of your great posts over the past couple of weeks to assist in my quest to get my 22' Zag Fab boat I bought at an Action running to no avail.
1) I have changed out all of the fuel lines, main filter, filter on the motor, two lift pumps, VST screen.
2) upon inspection I found that the last "mechanic" that worked on the motor pulled the screens out of the injectors. Had the injectors cleaned and flow tested, installed screens into the injectors.
All of the injectors passed three had 1.1 ohms of resistance, two had 1.2 and the new replacement had 1.3ohms. 295 - 305cc's
4) new plugs
5) new water pump
6) New 1100CCA battery at 13.2 volts
7) 115psi within 2psi on all 6
8) cleaned out the fuel tanks,
Ran the engine with a local outboard mechanics diagnostic computer on it. Said all 6 firing, 1000+ PSI on the high pressure, 60 PSI on the medium, All normal, showed one injector in the history as bad but I had already replaced it. 472 hours on her.
engine Speed 2825rpm
Fuel pressure( assume med pressure) 6.90Mpa
Fuel Pressure 1086PSI
Atmospheric pressure 893 HPa
Atmospheric pressure 26.4 InHg
Ignition timing BTDC 4 deg
Battery voltage 13.7
TPS voltage 1.07
Throttle valve opening 12.1 deg
Fuel injection duration .84 ms
Firing # 1-6 Yes
The motor was always hard to get fired up, initially ran rough, engaged into forward and ran it at 2300 rpm for about 20 minutes on ear muffs. Seemed to clean up, but started to miss. I thought it might just need to be run for a while because it had sat for two years previously. Brought it to the lake with New fuel and Seafoam in the tank with no ethanol. Ran on three cylinders, number one (left top) number four and five right top cylinders. Thought the plugs had fouled so switched the plugs from the running cylinders to the dead cylinders. Would not fire and start at all. Eventually got it running on three again after switching the plugs back to the running cylinders. Will not idle, (for long) primer bulb is hard.
Too get this engine started is a task, lots of cranking, I have to engage it into gear quickly when it fires, it will gradually speed up on the three running cylinders.
I am at wits end with this motor and have tried everything I could find on the net. Sorry for the long winded explanation but want to be sure to get all of the facts down. There are a lot of very mechanically inclinded members on this forum so wanted to get details down as accurately as possible.
Has bright blue spark on all 6 cylinders
The cylinders that are not firing appear to be only getting oil, by feel and smell. Other three plugs nice ****en brown
Any ideas or information would be greatly appreciated, I would take it to the local mechanic but he is busy for a few weeks then getting married,
I installed a new wiring harness kit Part number 90891-40460
Searched for hours looking for a year and model cross over all I could find was that it was for the HPDI, all plugs were the same no extra's.
Have an additional question regarding ECU for this motor. From the research I have done Yamaha HPDI Vmax engines used 16 bit technology until 2005 when they switched to 16/32bit, 2005 was the only year that has the 16/32 it was then switched to 32bit in 2006>. My question is will the wiring harness from a 2006> (32bit) work with a 2005 16/32 bit ECU? Can anyone tell me difference in the harnesses?
Borrowed my mechanics diagnostic cpu again today, very odd occurance as follows:
Testing injectors 1-6, 1-3 could be audibly heard clicking during the 10 second cycle. There was a faint buzzing in the injector driver area during the testing. When I tested injector four it did not actuate. I disconnected the wiring from injector number 4, the faint buzzing stopped, almost sounded like a muffled alarm. I switched the injector drivers top for bottom, bottom for top no buzzing this time, and performed a test on 4 again. As the other tests the med pressure fuel pump kicked in for 10 seconds and the test started, the medium pressure fuel pump kicked in rather than the injector? I took the plug off of number one injector and installed it on injector four and performed the test again, I could hear the injector working.
Any ideas what could cause this? I am tempted to install my old wiring harness, it has some fire damage from the previous owner (police boat) not bad but some of the wires are discoloured and I did notice the emergency oil switch started working with the new harness.
Still trying to get this motor running any ideas would be greatly appreciated.
Thank you
Scott
I have read many of your great posts over the past couple of weeks to assist in my quest to get my 22' Zag Fab boat I bought at an Action running to no avail.
1) I have changed out all of the fuel lines, main filter, filter on the motor, two lift pumps, VST screen.
2) upon inspection I found that the last "mechanic" that worked on the motor pulled the screens out of the injectors. Had the injectors cleaned and flow tested, installed screens into the injectors.
All of the injectors passed three had 1.1 ohms of resistance, two had 1.2 and the new replacement had 1.3ohms. 295 - 305cc's
4) new plugs
5) new water pump
6) New 1100CCA battery at 13.2 volts
7) 115psi within 2psi on all 6
8) cleaned out the fuel tanks,
Ran the engine with a local outboard mechanics diagnostic computer on it. Said all 6 firing, 1000+ PSI on the high pressure, 60 PSI on the medium, All normal, showed one injector in the history as bad but I had already replaced it. 472 hours on her.
engine Speed 2825rpm
Fuel pressure( assume med pressure) 6.90Mpa
Fuel Pressure 1086PSI
Atmospheric pressure 893 HPa
Atmospheric pressure 26.4 InHg
Ignition timing BTDC 4 deg
Battery voltage 13.7
TPS voltage 1.07
Throttle valve opening 12.1 deg
Fuel injection duration .84 ms
Firing # 1-6 Yes
The motor was always hard to get fired up, initially ran rough, engaged into forward and ran it at 2300 rpm for about 20 minutes on ear muffs. Seemed to clean up, but started to miss. I thought it might just need to be run for a while because it had sat for two years previously. Brought it to the lake with New fuel and Seafoam in the tank with no ethanol. Ran on three cylinders, number one (left top) number four and five right top cylinders. Thought the plugs had fouled so switched the plugs from the running cylinders to the dead cylinders. Would not fire and start at all. Eventually got it running on three again after switching the plugs back to the running cylinders. Will not idle, (for long) primer bulb is hard.
Too get this engine started is a task, lots of cranking, I have to engage it into gear quickly when it fires, it will gradually speed up on the three running cylinders.
I am at wits end with this motor and have tried everything I could find on the net. Sorry for the long winded explanation but want to be sure to get all of the facts down. There are a lot of very mechanically inclinded members on this forum so wanted to get details down as accurately as possible.
Has bright blue spark on all 6 cylinders
The cylinders that are not firing appear to be only getting oil, by feel and smell. Other three plugs nice ****en brown
Any ideas or information would be greatly appreciated, I would take it to the local mechanic but he is busy for a few weeks then getting married,
I installed a new wiring harness kit Part number 90891-40460
Searched for hours looking for a year and model cross over all I could find was that it was for the HPDI, all plugs were the same no extra's.
Have an additional question regarding ECU for this motor. From the research I have done Yamaha HPDI Vmax engines used 16 bit technology until 2005 when they switched to 16/32bit, 2005 was the only year that has the 16/32 it was then switched to 32bit in 2006>. My question is will the wiring harness from a 2006> (32bit) work with a 2005 16/32 bit ECU? Can anyone tell me difference in the harnesses?
Borrowed my mechanics diagnostic cpu again today, very odd occurance as follows:
Testing injectors 1-6, 1-3 could be audibly heard clicking during the 10 second cycle. There was a faint buzzing in the injector driver area during the testing. When I tested injector four it did not actuate. I disconnected the wiring from injector number 4, the faint buzzing stopped, almost sounded like a muffled alarm. I switched the injector drivers top for bottom, bottom for top no buzzing this time, and performed a test on 4 again. As the other tests the med pressure fuel pump kicked in for 10 seconds and the test started, the medium pressure fuel pump kicked in rather than the injector? I took the plug off of number one injector and installed it on injector four and performed the test again, I could hear the injector working.
Any ideas what could cause this? I am tempted to install my old wiring harness, it has some fire damage from the previous owner (police boat) not bad but some of the wires are discoloured and I did notice the emergency oil switch started working with the new harness.
Still trying to get this motor running any ideas would be greatly appreciated.
Thank you
Scott
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