first off ! excellent that your road trip went well!!!
the 444E is not a fast engine, esp if you have the 175 HP variant.. or the 190 in a full size bus.. I see yours is a 3000.. is that a flat nose RE 11 or 12 row?
if you have the 190 HP variant of the 444E you will get 14-16 lbs of boost at full throttle and 2500-2600 RPM.. if your RPM is below that you womnt get that high of boost.. which HP stamp is marked on your valve cover?
DONT overfill the oil.. it WILL blow it out of the draft tube.. and its EASY to overfill the oil as you pour it in the valve cover so it takes a little while for it to settle down to the pan.. so you pour some and check it and still looks low ..you need to give it a few minutes after you pour it to re-check it..
the ICP jumps all over that is normal as the engine demand moves a bit.. not sure why they say the duty cyclke isnt available for that engine.. i read it all the time on mine..
.33 volt vs .25.. thats .08 differenct or close to 20%.. thats a big deviation.. enough that can cause the WARN light to come on.. the engine will still operate even when the code is active.. if the ECM thinks that the ICP is not responding at all then it will set another code, disable reading the ICP and run at a set default value of pushing the IPR to a certain state.. but an IPR reading that far off can mean an issue.. however if the ICP is reading it back correctly then it just means the ECM must command it differently.. however if it goes to default mode you will for sure have less boost than if its operating normal.. or if the ICP is lying to the ECM then it may not be pushing enough HPOP pressure.. only way to know is run the computer, read it and a real gauge on the HPOP at the sdame time.
some people just automatically replace the ICP and the IPR when they buy a used 444E..
if you get your 444E hot, it will begin to de-rate power at 216 degrees f coolant or oil temperature.. high oil temperatures are caused by running flat out RPM in hot weather.. usually the coolant temp is up there too..
also if yours has an EBPV make sure htat is working OK.. thats a known issue to cause low power.. as it is blocking part of the exhaust (to warm the engine up in cold weather).. if that doesnt function correctly then you have excessive exhaust backpressure and less flow into the turbo turbine.. which results in lost boost / power..
the 444E is a V-8 diesel.. while it is on paper rated at its peak torwue at a low RPM in the mid teens.. and peak HP at 2300... unlike an inline 6 diesel that likes to run at its peak Torque RPM, the 444E feels most powerful when its RPMs are above 2200 or so... this is **NOT** where you want to cruise out.. (my 444E loves to highway cruise at 1600-1800 RPM(65 MPH - 1550 RPM(6th), and 1750 or so (5th)).. the high RPMs are what it likes for making boost and climbing hills or pulling into traffic... so when i climb a hill I pull it down to 4th (2450 RPM at 65).. Ill see my boost rise up to over 15 if I get it up to 2600 or so.. max is 2700 on mine,
-Christopher
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