Mitsubishi 4D34T Troubleshooting
| Engine Model: Mitsubishi 4D34T |
| Engine Type: 4-cycle inline 4-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 238.5 cu.in (3.9 L) |
| Rated Engine Power: 135-150 Hp (100-112 kW) at 2900 rpm |
| Fuel System Type: Direct fuel injection |
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| Engine hard to start or doesn't start |
Fuel filter plugged - Replace the filter element.
Air in fuel system - Bleed fuel system.
Dirty or damaged injection nozzles - Clean or replace injection nozzles.
Fuel injection pump malfunction - Install a new pump or rebuild.
Incorrect valve timing - Use correct valve timing adjustment.
Fuel pipes are clogged - Service or replace fuel pipes.
Injection timing is incorrect - Check injection timing adjustment.
Damaged piston rings and cylinder - Replace defective components.
| Engine starts and stops suddenly |
Fuel filter plugging - Filter maintenance required.
Fuel injection pump failure - Install a new fuel pump or repair.
Air filter clogged - Carry out maintenance on air filter.
Incorrect nozzle opening pressure - Adjust according to specifications.
| Diesel shuts off while driving |
Fuel injection timing is not adjusted - Adjust the pump as required.
Fuel filter element clogging - Replace the filter element.
Coolant temperature is low - Engine is not warmed up to the required temperature.
Stuck or burnt injection nozzle - Change or repair injection nozzles.
Incorrectly set low idle speed - Adjust low idle speed.
Valve clearance is wrong - Adjustment procedure required.
Fuel injection pump failure - Install a new fuel pump or repair.
Clogged or defective injection nozzles - Check and replace nozzles if required.
Fuel hoses or lines clogging - Clean fuel lines and hoses.
Dirty air filter element - Service or replace the air filter.
Blown cylinder head gasket - Install a new gasket.
Injection timing is wrong - Adjust as recommended.
Faulty fuel injection pump - Repair or install a new fuel pump.
One of moving engine components has failed - Replace or repair damaged components.
Defective radiator cap or clogged radiator fins - Clean radiator or install new cap.
Engine coolant is insufficient - Add coolant and check the components of cooling system.
Fan belt slipping or worn - Replace as required.
Not enough engine oil - Fill up the oil to required level.
Damaged cylinder-head gasket - Install new cylinder head gasket.
Wrong injection timing - Adjust injection timing as required.
Oil level is low - Fill the crankcase with oil.
Oil pump is damaged - Inspect and change as required.
Plugged engine oil filter - Service or replace engine oil filter.
Worn or dirty relief valve - Replace or clean relief valve.
Excessive crankshaft bearing clearance - Test and replace or repair worn components.
Clearance of crankpin bearing is excessive - Test and repair or replace worn parts.
| Engine oil consumption is too high |
Oil leaking: Gaskets or seals can be faulty - Defective components must be replaced.
Improper oil viscosity - Fill up with the correct oil viscosity.
Piston rings are defective or worn - Install new piston rings.
Worn valve stems and valve guides - Change the valves.
Scored cylinder liners or pistons - Inspect liners and pistons, replace as necessary.
Low coolant temperature - Warm up the engine.
Engine oil level low - Fill the crankcase with engine oil.
Improper fuel injection timing - Set it up as required.
Scored or worn pistons - Replace the pistons.
Connecting rod failure or misalignment - Need to replace or align the connecting rod.
Low battery capacity - Battery is drained, charge it.
Battery is not holding charge - Service charging system or replace battery.
Disconnected wires or corroded battery terminals - Connect cables properly or replace terminals.
Battery is low or faulty - Battery needs to be recharged or replaced.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Low battery voltage - Recharge the battery.
Damaged starter motor - Starter needs to be replaced.
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