Problem with 2005 HPDI 225

[Skeeter185]

Buddy has a problem with his 2005 HPDI 225. Started out running fine this last week at a championship and about half way through a 20 mile run the rpms dropped back to 4200 and top speed was 35. Motor sounded fine. I checked primer bulb and it was hard. Oil tank was completely full. Got to our spot slowly, shut it off fished for about 2 hours, fired it back up and it ran fine the rest of the day. Next day it started off fine and halfway through same run it starts same symptons as day 1. Get to our spot and fish and go to make run back and this time it did not clear up. Any ideas? By the way we changed out the plugs after the first day problems.

[Team Stratos]

Sounds like his plugs are fouling. My guess is it's running cold maybe due to thermostats stuck open. What is his water pressure at WOT? Is he burning any thing higher than 87 octane? My 03 did the same thing way back in 05. Turned out some trash had the thermostats stuck open.

[Skeeter185]

Changed out the plugs to new ones after the first day of the problem, still did it on the second day and got worse. He's burning 87 octane. Thermostats could have trash stuck in them since we were fishing Lake Guntersville and were in the grass. Removed water intake screens and they were not clogged. Stats could be open I guess. Water pressure was 25 at WOT.

[taeheel2az]

When my OX66 did this, it was the engine dropping into guardian mode from overheating. The dash lamp didn't come on. The underlying problem was that one fo the thermostats had so much lime deposit that it wasn't opening correctly. Had OK water pressure nd flow from the tell tale

[Skeeter185]

I told him I thought that it was going into the safe mode also but didn't know what could be causing it as we did not get any warning lights or buzzers. So far its 2 posts for Thermostats, keep it coming, and thanks guys.

[E-man]

Have the same engine(size and model)had the exact same issue. These little filters were clogged.
http://www.thehulltruth.com/bo....html

[Charlie206]

It's the fuel strainer, between the vst and high pressure pump.