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unburnt fuel
one of the causes of all three symptoms is a bad fuel injector
Unburnt fuel
It is the high temp and the high return Pressure inside the injector that causes the fuel To turn black
not the perfect air fuel mixture. normal under load and acceleration.
changed engine
yes...the lack of air would causes excessive fuel which would cause black smoke.
The black smoke that a diesel engine blows out is fuel that is unburned. The black smoke can be caused from over-fueling, poor fuel quality, or dirty or worn fuel injectors.
Black smoke is : too much fuel and not enough air, a faulty injector (s). Take out the injectors and have them tested before you do engine damage.
Unburnt fuel in exhaust.
In a diesel engine, blue smoke is an indication of oil being burned. Black smoke means that there is incomplete combustion of the fuel. White smoke can be seen when raw diesel fuel is not being burned.
Starter Relay Isuzu Trooper (Diesel Engine) located in fuse box (engine room), grey color. They have 4 relay (Power Windows-black, AC-black, Engine/Alternator-blue, and Starter-diesel engine-grey)