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Toyota 1HD-FT Troubleshooting
| Engine hard to start or won't start |
Fuel filter element clogging - Clean or change the filter.
Air in fuel system - Bleed fuel system.
Clogged or defective injection nozzles - Check injection nozzles and replace if required.
Faulty fuel injection pump - Repair or change injection pump.
Unadjusted valve timing - Set the valve timing correctly.
Restricted fuel pipes - Service fuel pipes.
Unadjusted injection timing - Adjust injection timing as required.
Piston rings and cylinder are worn - Replace faulty parts.
| Engine starts but stalls suddenly |
Fuel filter plugged - Clean the filter or install new filter element.
Fuel injection pump is damaged - Repair or install new pump.
Dirty air cleaner - Carry out maintenance on air filter.
Improper nozzle opening pressure - Adjust as recommended.
| Engine stops running suddenly |
Improper fuel injection timing - Check the fuel injection pump timing adjustment.
Dirty fuel filter - Change filter element.
Engine is not warmed up to the required temperature - Warm up to required temperature.
Injection nozzles are burnt or jammed - Clean or change injection nozzles.
| Engine stalls while idling |
Improperly adjusted low idle speed - Normalize low idle speed.
Valve clearance is wrong - Check and adjust.
Damaged fuel injection pump - Replace injection pump or repair it.
| Low engine power |
Fuel injection nozzles are damaged - Clean or change injection nozzles.
Dirty fuel hoses or lines - Fuel lines and hoses need to be cleaned.
Air cleaner is dirty - Replace air filter element.
Cylinder head gasket defective - Gasket should be replaced.
Improper injection timing - Adjust as recommended.
Fuel injection pump failure - Repair or install a new fuel pump.
One of moving engine parts is faulty - Repair or replace defective parts.
| Engine overheated |
Faulty radiator cap or dirty radiator fins - Clean radiator or replace cap.
Lack of coolant in cooling system - The cooling system needs to be refilled and checked for faults.
Broken or loose fan belt - Change as required.
Lack of engine oil - Add oil to the engine crankcase.
Cylinder-head gasket is leaking - Change cylinder head gasket.
Incorrect injection timing - Adjust injection timing as required.
| Oil pressure is low |
Low crankcase oil level - Check oil level and add oil as required.
Oil pump is damaged - Repair or replace.
Oil filter is dirty - Change or clean engine oil filter element.
Relief valve is stuck or worn - Change or clean relief valve.
Crankshaft bearing clearance is excessive - Check and replace or repair defective parts.
Crankpin bearing clearance is excessive - Test and replace or repair worn components.
| Engine using too much oil |
External oil leaks: Seals or gaskets are wearing excessively - Worn parts need to be replaced.
Crankcase oil too light - Fill up with the correct oil viscosity.
Damaged or seized piston rings - Have piston rings replaced.
Worn valve stems and valve guides - Change the valves.
Cylinder liners or pistons are scored - Inspect pistons and liners, replace as required.
| Engine noises or knocks |
Engine is not warmed up to the required temperature - Warm up the engine.
Engine oil level low - Add oil to the engine crankcase.
Timing of fuel injection pump is incorrect - Use the correct fuel injection pump timing adjustment.
Broken or worn pistons - Replace the pistons.
Connecting rod is not aligned or worn - Connecting rod must be aligned or replaced.
| Starter turns slowly |
Low battery capacity - Low battery charging, charge as required.
Battery is draining quickly - Service or change the battery.
Disconnected wires or corroded battery terminals - Check cable connections and change or clean terminals.
| Starter does not work |
Battery is discharged or worn - Recharge or change battery.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Low battery capacity - Recharge the battery.
Starter motor is defective - Repair or replace starter.
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