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Hi Allen, Lugging a diesel engine is where your running WOT without gaining RPM at peak torque design or at a higher RPM. "Lugging can occur at any RPM." If lugging happens below design peak torque very often, it will tear the bottom out of the engine (read as very expensive to repair). Read the Cummins engine website for the above explanation as I have not found another website that explains it better. Wet Stacking is where carbon deposits are formed under the valves and/or in the valve seats. This doesn't allow for the valve to seat correctly on each stroke. Wet stacking occurs at low RPM and multiplies rapidly when the engine is under a lite load. Depending on the engine design, most fuel efficency starts at 180* and peaks at 200* plus. My PSD, DI engine, does not like prolonged idleing. When in lo-range, empty, creeping the backcountry for several hours it will load the cylinders up and there is a distink engine power degrade. I then have to rap it up for a couple minutes and she blows black smoke something terrible. At peak torque pulling 16k GCW it does not smoke at all, well that you can see in the mirrors anyway. It's a diesel, it smokes! I also have a IDI diesel that can idle for 24hrs straight with out any signs of having any problems and it has 7500hrs on it. I use Type F, ATF mixed at 1qt/50gal #2D, for a in-engine injector cleaner. A time proven method of 50yrs plus. Injectors out of engine then I use Berryman B-12. You might also look for an fuel suction air leak. Take the fuel tank return line off into a clean bucket and if the fuel stream has air bubbles in it, you have a suction air leak somewhere. You can also use the fliter drain on some engines and run that into a bucket. A suction leak can occur on the pressure side as well as the vacumm side but will not drip fuel. Cover each fitting, one at a time, with a heavy oil while observing the fuel flow. If the bubbles stop, you found your suction leak. T_Bone
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