21contender
Recruit
- Joined
- Feb 26, 2010
- Messages
- 3
Have done multiple searches and found nothing related to my condition. Any thoughts or suggestions greatly appreciated.
2001 200hpdi 250hrs, compression 115 to 120 on all 6 cylinders, new VST strainer (very little trash found in bottom of canister) new steel can EFI filter,new filter in clear resevoir bowl, new oil tank filter, new water seperator, (fuel sample revealed no water and minimal trash in seperator). 52psi with key on 48psi engine idling on trailer for low pressure fuel system.
Condition: engine cranks and idles fine on trailer, accelerates in neutral fine on trailer. When engine is put in the water it won't idle. When at the landing with boat on trailer if you trim the engine up enough to have the foot in the water but the prop out of the water engine will crank up and idle fine, as soon as you trim the engine down and begin to submerge the prop engine cuts off. If you throttle it up in neutral it is still difficult to start but it will start and stay running (roughly) only if throttle is up while prop is submerged. If you can keep it running and then engage the foot the boat will pull fine without any skipping or sputtering.
After replaceing the above mentioned parts along with cleaning the plugs that only have 1.5 hours on them. The problem still exists.
Took it to the Yamaha dealer and gave them a detailed description of what engine was doing. 3 days later they called and said it was ready, when asked what was done to address the issue they stated: new plugs, throttle sync, tps adjustment, cleaned grounds, cleaned and tested o2 sensor and water tested in tank for at least half hour.They also stated that ECU was giving a code for internal memory fault and that engine would show no past run data but that this would not affect driveability, thay said that ECU shows current run data but would not retain past data. Picked the boat up went straight to the landing and exact same condition as before.
Now dealer suspects ECU as the problem.
Typically with a back pressure issue I would suspect low compression but 2 different gauges were used and only 5psi variation between gauges noticed
Stumped in Charleston
Glenn
2001 200hpdi 250hrs, compression 115 to 120 on all 6 cylinders, new VST strainer (very little trash found in bottom of canister) new steel can EFI filter,new filter in clear resevoir bowl, new oil tank filter, new water seperator, (fuel sample revealed no water and minimal trash in seperator). 52psi with key on 48psi engine idling on trailer for low pressure fuel system.
Condition: engine cranks and idles fine on trailer, accelerates in neutral fine on trailer. When engine is put in the water it won't idle. When at the landing with boat on trailer if you trim the engine up enough to have the foot in the water but the prop out of the water engine will crank up and idle fine, as soon as you trim the engine down and begin to submerge the prop engine cuts off. If you throttle it up in neutral it is still difficult to start but it will start and stay running (roughly) only if throttle is up while prop is submerged. If you can keep it running and then engage the foot the boat will pull fine without any skipping or sputtering.
After replaceing the above mentioned parts along with cleaning the plugs that only have 1.5 hours on them. The problem still exists.
Took it to the Yamaha dealer and gave them a detailed description of what engine was doing. 3 days later they called and said it was ready, when asked what was done to address the issue they stated: new plugs, throttle sync, tps adjustment, cleaned grounds, cleaned and tested o2 sensor and water tested in tank for at least half hour.They also stated that ECU was giving a code for internal memory fault and that engine would show no past run data but that this would not affect driveability, thay said that ECU shows current run data but would not retain past data. Picked the boat up went straight to the landing and exact same condition as before.
Now dealer suspects ECU as the problem.
Typically with a back pressure issue I would suspect low compression but 2 different gauges were used and only 5psi variation between gauges noticed
Stumped in Charleston
Glenn
