HomsiMotors|diagnostic fault answers - engine diagnostic test

The engine does not start: Checks by the user
Starter motor turns engine too slowly
Fuel tank empty
Fault in stop control
Restriction in a fuel pipe
Fault in fuel lift pump
Dirty fuel filter element
Air in fuel system
Fault in atomisers or atomisers of an incorrect type
Cold start system used incorrectly
Fault in cold start system
Wrong type or grade of fuel used

Check by the workshop personnel
Fault in fuel injection pump
Broken drive on fuel injection pump
Timing of fuel injection pump is incorrect
Valve timing is incorrect
Bad compression
Valves are not free
Worn cylinder bores
Leakage between valves and seats
Piston rings are not free or they are worn or broken
The starter motor turns the engine too slowly: Checks by the user
Battery capacity low
Bad electrical connections
Fault in starter motor
Wrong grade of lubricating oil
The engine is difficult to start: Checks by the user
Starter motor turns engine too slowly
Fault in stop control
Restriction in a fuel pipe
Fault in fuel lift pump
Dirty fuel filter element
Restriction in filter/cleaner or air induction system
Air in fuel system
Fault in atomisers or atomisers of an incorrect type
Cold start system used incorrectly
Fault in cold start system
Restriction in fuel tank vent
Wrong type or grade of fuel used
Restriction in exhaust pipe

Check by the workshop personnel
Fault in fuel injection pump
Timing of fuel injection pump is incorrect
Valve timing is incorrect
Bad compression
Valves are not free
Worn cylinder bores
Leakage between valves and seats
Piston rings are not free or they are worn or broken
Not enough power: Checks by the user
Restriction in a fuel pipe
Fault in fuel lift pump
Dirty fuel filter element
Restriction in filter/cleaner or air induction system
Air in fuel system
Fault in atomisers or atomisers of an incorrect type
Restriction in fuel tank vent
Wrong type or grade of fuel used
Restricted movement of engine speed control
Restriction in exhaust pipe
Engine temperature is too high
Engine temperature is too low

Check by the workshop personnel
Fault in fuel injection pump
Timing of fuel injection pump is incorrect
Valve timing is incorrect
Bad compression
Cylinder head gasket leaks
Worn cylinder bores
Leakage between valves and seats
Piston rings are not free or they are worn or broken
Turbocharger impeller is damaged or dirty
Induction system leaks (turbocharged engines)
Turbocharger waste-gate does not work correctly (if there is one fitted)
Misfire: Checks by the user
Restriction in a fuel pipe
Fault in fuel lift pump
Dirty fuel filter element
Air in fuel system
Fault in atomisers or atomisers of an incorrect type
Fault in cold start system
Engine temperature is too high
Valve tip clearances are incorrect

Check by the workshop personnel
Fault in fuel injection pump
Timing of fuel injection pump is incorrect
Valve timing is incorrect
Bad compression
Cylinder head gasket leaks
Valves are not free
Wrong high-pressure pipes
Leakage between valves and seats
High fuel consumption: Checks by the user
Restriction in filter/cleaner or air induction system
Fault in atomisers or atomisers of an incorrect type
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
Valve tip clearances are incorrect

Check by the workshop personnel
Fault in fuel injection pump
Timing of fuel injection pump is incorrect
Valve timing is incorrect
Bad compression
Cylinder head gasket leaks
Valves are not free
Wrong high-pressure pipes
Leakage between valves and seats
Black exhaust smoke: Checks by the user
Restriction in filter/cleaner or air induction system
Fault in atomisers or atomisers of an incorrect type
Fault in cold start system
Wrong type or grade of fuel used
Restriction in exhaust pipe
Engine temperature is too low
Valve tip clearances are incorrect

Check by the workshop personnel
Fault in fuel injection pump
Timing of fuel injection pump is incorrect
Valve timing is incorrect
Bad compression
Cylinder head gasket leaks
Valves are not free
Worn cylinder bores
Leakage between valves and seats
Piston rings are not free or they are worn or broken
Turbocharger impeller is damaged or dirty
Induction system leaks (turbocharged engines)
Blue or white exhaust smoke: Checks by the user
Wrong grade of lubricating oil
Fault in cold start system
Engine temperature is too low
Too much oil or oil of wrong specification used in wet type oil cleaner

Check by the workshop personnel
Timing of fuel injection pump is incorrect
Valve timing is incorrect
Bad compression
Cylinder head gasket leaks
Worn cylinder bores
Piston rings are not free or they are worn or broken
Valve stems and/or guide are worn
Piston is damaged
Valve stem seal is damaged (if there is one fitted)
Lubricating oil seal of turbocharger leaks
The pressure of lubricating oil is too low: Checks by the user
Wrong grade of lubricating oil
Not enough lubricating oil in sump
Defective gauge
Dirty lubricating oil filter element

Check by the workshop personnel
Crankshaft bearings are worn or damaged
Lubricating oil pump is worn
Relief valve does not close
Relief valve spring is broken
Fault suction pipe of lubricating oil pump
Restriction in sump strainer
The engine knocks: Checks by the user
Fault in fuel lift pump
Fault in atomisers or atomisers of an incorrect type
Fault in cold start system
Wrong type or grade of fuel used
Engine temperature is too high
Valve tip clearances are incorrect
Too much oil or oil of wrong specification used in wet type oil cleaner

Check by the workshop personnel
Timing of fuel injection pump is incorrect
Valve timing is incorrect
Valves are not free
Worn cylinder bores
Piston rings are not free or they are worn or broken
Crankshaft bearings are worn or damaged
Piston is damaged
Piston height is incorrect
Valve spring is broken
The engine runs erratically: Checks by the user
Fault in stop control
Restriction in a fuel pipe
Fault in fuel lift pump
Dirty fuel filter element
Restriction in filter/cleaner or air induction system
Air in fuel system
Fault in atomisers or atomisers of an incorrect type
Fault in cold start system
Restriction in fuel tank vent
Restricted movement of engine speed control
Engine temperature is too high
Valve tip clearances are incorrect
Too much oil or oil of wrong specification used in wet type oil cleaner

Check by the workshop personnel
Fault in fuel injection pump
Bad compression
Valves are not free
Wrong high-pressure pipes
Piston rings are not free or they are worn or broken
Piston is damaged
Valve spring is broken
Vibration: Checks by the user
Fault in atomisers or atomisers of an incorrect type
Restricted movement of engine speed control
Engine temperature is too high
Fan damaged
Fault in engine mounting or flywheel housing

Check by the workshop personnel
Fault in fuel injection pump
Bad compression
Cylinder head gasket leaks
Valves are not free
Wrong high-pressure pipes
Piston rings are not free or they are worn or broken
Piston is damaged
Flywheel housing or flywheel is not aligned correctly
The pressure of the lubricating oil is too high: Checks by the user
Wrong grade of lubricating oil
Defective gauge

Check by the workshop personnel
Relief valve does not open
The engine temperature is too high: Checks by the user
Restriction in filter/cleaner or air induction system
Fault in atomisers or atomisers of an incorrect type
Fault in cold start system
Restriction in exhaust pipe
Fan damaged
Too much lubricating oil in sump
Restriction in air or water passages of radiator
Insufficient coolant in system

Check by the workshop personnel
Fault in fuel injection pump
Fault in fuel injection pump Timing of fuel injection pump is incorrect Valve timing is incorrect Cylinder head gasket leaks Piston is damaged Fault in thermostat or thermostat is of an incorrect type Restriction in coolant passages Fault in water pump Turbocharger waste-gate does not work correctly (if there is one fitted)
Crankcase pressure: Checks by the user
Restriction in breather pipe
Vacuum pipe leaks or fault in exhauster

Check by the workshop personnel
Cylinder head gasket leaks
Worn cylinder bores
Piston rings are not free or they are worn or broken
Valve stems and/or guide are worn
Piston is damaged
Bad compression: Checks by the user
Restriction in filter/cleaner or air induction system
Valve tip clearances are incorrect

Check by the workshop personnel
Valve timing is incorrect
Cylinder head gasket leaks
Valves are not free
Worn cylinder bores
Leakage between valves and seats
Piston rings are not free or they are worn or broken
Valve stems and/or guide are worn
Piston height is incorrect
Valve spring is broken
The engine starts and stops: Checks by the user
Dirty fuel filter element
Restriction in filter/cleaner or air induction system
Air in fuel system

Fault Diagnostics