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• Air in fuel system.
• Restriction air filter/cleaner or induction system.
• Restriction in exhaust pipe.
• Fault in injectors or injectors are out of adjustment.
• Restriction in fuel tank vent.
• Wrong type or grade of fuel used.
• Restricted movement of engine speed control.
• Engine temperature is too high or low.
Misfire
• Restriction in a fuel pipe.
• Faulty in fuel lift pump.
• Dirty fuel filter element.
• Air in fuel system.
• Fault in injectors or injectors are out of adjustment.
• Fault in cold start system.
• Engine temperature is too high.
• Incorrect valve tip clearances.
• Oil pressure sensor / switch or its connection is
faulty.
The pressure of the lubrication oil is too low
• Wrong grade of lubrication.
• Not enough lubrication oil in sump.
• Defective gauge.
• Dirty lubrication oil filter element.
High fuel consumption
• Restriction air filter/cleaner or induction system.
• Fault in injectors or injectors are out of adjustment.
• Fault in cold start system.
• Wrong type or grade of fuel used.
• Restricted movement of engine speed control.
• Restriction in exhaust pipe.
• Engine temperature is too low.
• Incorrect valve tip clearances.
Black exhaust smoke
• Restriction air filter/cleaner or induction system.
• Fault in injectors or injectors are out of adjustment.
• Fault in cold start system.
• Wrong type or grade of fuel used.
• Restriction in exhaust pipe.
• Engine temperature is too low.
• In correct valve tip clearances.
• Engine over load.
Blue or white exhaust smoke
• Wrong grade of lubrication.
• Fault in cold start system.
• Engine temperature is too low.
The engine knocks
• Faulty in fuel lift pump.
• Fault in injectors or injectors are out of adjustment.
• Wrong type or grade of fuel used.
• Fault in cold start system.
• Engine temperature is too high.
• In correct valve tip clearances.
The engine runs erratically
• Fault in fuel control.
• Restriction in a fuel system.
• Faulty in fuel lift pump.
• Dirty fuel filter element.
• Restriction air filter/cleaner or induction system.
• Air in fuel system.
• Fault in injectors or injectors are out of adjustment.
• Fault in cold start system.
• Restriction in fuel tank vent.
• Restricted movement of engine speed control.
• Engine temperature is too high.
• In correct valve tip clearances.
Vibration
• Fault in injectors or injectors are out of adjustment.
• Restricted movement of engine speed control.
• Engine temperature is too high.
• Fan damaged.
• Faulty in engine mounting or flywheel housing.
The engine temperature is too high
• Restriction air filter/cleaner or induction system.
• Fault in injectors or injectors are out of adjustment.
• Fault in cold start system.
• Restriction in exhaust pipe.
• Fan damaged.
• Too much lubrication oil in sump.
• Restriction in air or water passage of radiator.
• Engine thermostats are faulty.
• Insufficient coolant system.
Crankcase pressure
• Restriction in breather pipe.
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