"Hunting" is the term generally applied to an engine that will not maintain a constant speed with a fixed throttle setting. Most modern engines with electronic feedback controls do no have this problem. It is usually found in older diesels that use a "governor" to control speed. The governor is a centrifugal weight system that applies force to a spring-loaded fuel flow control. Hunting is caused when the linkages become worn and sloppy, causing a variable relationship between engine speed and fuel feed rate.
There is no such engine as a Cummins 2500 Diesel.
pree ignition timing is advanced
one of the causes is bad low quality fuel
There are several causes for high fuel consumption in a diesel engine. These include a difference in the weight of the vehicle, increased usage of air conditioning, and a difference in tire pressure.
Blue smoke is burning oil.
dirty fuel filters for one !!
You eating the engine.
unburnt fuel
Dirty fuel filter
Diesel engines do not engine brake like gasoline engines do, so relatively speaking, the rate of deceleration would seem to be slower.
Either a faulty engine temperature sensor or the wiring to it.
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