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Was wondering if anyone can help shed some light on a subject I am having problems with. I recently rebuilt my 2000 200HP HPDI due to a hole in the #1 head. It required a new crank, pistons, etc. During the rebuild, I took my injectors to Chris at Injector RX and had them checked. He brought me to the room that he tests the injectors and we discovered that 3 of the 6 were not working as they should be. He was not able to get them working, so I replaced them with new. He mentioned to me that I may also want to change the filters in the fuel pump and clean up the high pressure pump. I didn't do that as money was running out and now am wondering if that could be what is causing some of my issues.
I have about 15 hours on the engine since then which include the 10 hours needed for break-in. I am only able to get in the 4400 RPM range at WOT. I took the prop in to have it checked out and he said I would have to change it 4 degrees to get what I needed and that was not what the problem is. So I ruled that out, him knowing my boat brand, engine, etc. and comparing it to others.
During this past weekend, we had it out and were running and my RPM's started dropping from about 3900 which is where I typically run down to about 2500. I was able to trim my motor up and get about 3900 RPM, which would normally plane my boat out, and it seemed real sluggish. I then shut it off in the middle of the bay and started looking to see if I could see anything that may have come loose, holes, etc. When I checked the plugs, the bottom 2 plugs on the starboard side of the motor were fouled. I changed them out with 2 new ones that I had on the boat and it started and ran back at the 4400 RPM's that it was before and had plenty of power. We finished the day out fishing and on the way back in, it started the lower power thing again. Checked the plugs again, same 2 were fouled.
My question is, I am reading the repair manuals and am getting a little confused as to what the next item would be to check. Does anyone have an idea that you could throw my way as to what may be causing this. I plan on taking the fuel pump assembly in (vapor seperator and high pressure pump) and having Chris at Injector RX clean it as well as check the injectors again. I just thought while I had everything torn down, now would be a good time to check anything else that may be causing this issue.
As you can tell, I am more of a wrench turner than a mechanic. That is why I like this site so much and appreciate all you guy's help with this project. Anything anyone would suggest sure would be appreciated.
Thanks again,
Brad
I have about 15 hours on the engine since then which include the 10 hours needed for break-in. I am only able to get in the 4400 RPM range at WOT. I took the prop in to have it checked out and he said I would have to change it 4 degrees to get what I needed and that was not what the problem is. So I ruled that out, him knowing my boat brand, engine, etc. and comparing it to others.
During this past weekend, we had it out and were running and my RPM's started dropping from about 3900 which is where I typically run down to about 2500. I was able to trim my motor up and get about 3900 RPM, which would normally plane my boat out, and it seemed real sluggish. I then shut it off in the middle of the bay and started looking to see if I could see anything that may have come loose, holes, etc. When I checked the plugs, the bottom 2 plugs on the starboard side of the motor were fouled. I changed them out with 2 new ones that I had on the boat and it started and ran back at the 4400 RPM's that it was before and had plenty of power. We finished the day out fishing and on the way back in, it started the lower power thing again. Checked the plugs again, same 2 were fouled.
My question is, I am reading the repair manuals and am getting a little confused as to what the next item would be to check. Does anyone have an idea that you could throw my way as to what may be causing this. I plan on taking the fuel pump assembly in (vapor seperator and high pressure pump) and having Chris at Injector RX clean it as well as check the injectors again. I just thought while I had everything torn down, now would be a good time to check anything else that may be causing this issue.
As you can tell, I am more of a wrench turner than a mechanic. That is why I like this site so much and appreciate all you guy's help with this project. Anything anyone would suggest sure would be appreciated.
Thanks again,
Brad
When running on the hose, it sounds "boggy" is the only way I can describe it. You can definitely tell it isn't right. It does sound good idling though.
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