________________________________________________________________________________________
| Home / Car Engines / Toyota Engines / Toyota 1AR-FE |
Toyota 1AR-FE Troubleshooting
| Engine starts up hard or doesn't start |
Fuel tank is empty - Fill it up.
Incorrect fuel grade - Use correct gasoline grade.
Air in the fuel lines - Bleed the fuel lines.
Defective spark plug wire connection - Inspect the spark plug wire connection, replace or repair.
Faulty spark plug - Spark plug need to be replaced.
Ignition system failure - Check ignition and replace faulty components.
Plugged fuel filter - Install new filter.
Dirt in the fuel lines - Clean fuel lines.
Fuel pump is defective or dirty - Service or change fuel pump.
Fuel injectors are clogged or faulty - Clean or install new fuel injectors.
Low engine compression - Inspect cylinder block and change defective components.
| Engine runs unevenly |
Ignition system is defective - Check ignition system and replace faulty parts.
Dirty air filter element - Clean or change air filter.
Faulty spark plug - Replace spark plug.
Clogged or damaged fuel pump - Test fuel pump and change if necessary.
Valve clearance is wrong - Adjustment procedure required.
Ignition timing is improper - Adjust ignition timing correctly.
Low idle speed setting is incorrect - Correct idle settings.
| Engine starts but stalls suddenly |
Damaged spark plug - Replace spark plug.
Fuel injectors are defective or dirty - Test fuel injectors and replace if necessary.
Ignition coil is not working - Replace ignition coil as necessary.
Valve springs are worn or loose - Change valve springs.
Valves sticking - Valves must be cleaned.
| Engine overheating |
Engine oil insufficient - Add oil to the engine crankcase.
Engine overloaded - Reduce the load.
Dirty fuel injectors - Test fuel injectors and service if necessary.
Improper ignition timing - Adjust ignition timing correctly.
Improper valve setting - Adjust valves as required.
Dirty radiator fins or faulty radiator cap - Clean radiator or change cap.
Coolant level is low - The cooling system needs to be refilled and checked for faults.
Thermostat is defective - Thermostat need to be replaced.
Water pump failure - Install new water pump.
| Engine knocks or noises |
Low octane gasoline - Use correct gasoline.
Engine overload - Reduce engine load.
Low engine oil level - Check oil level and add oil as required.
Wrong adjustment of low idle speed - Correct idle adjustment.
Fuel pump is damaged or dirty - Inspect fuel pump and change as required.
Crankshaft or main bearings failure - Repair or replace defective parts.
Incorrect valve clearance - Adjust valve clearance.
Cylinder bore or piston rings are worn - Replace faulty components.
| Engine loses power |
Fuel injectors are damaged or dirty - Service or change fuel injectors.
Dirty air filter element - Service or replace air filter.
Fuel pump is clogged or faulty - Clean or change fuel pump.
Ignition system problems - Test ignition and replace failed parts.
Cylinder head gasket is blown - Cylinder-head gasket replacement required.
Stuck or burned valves - Service or change valves.
Damaged cylinder block components - Replace defective parts as required.
Clogged oil filter - Change or service oil filter.
| Engine uses too much fuel |
Air filter is blocked - Change or service air filter.
Fuel injectors are defective or dirty - Clean or install new fuel injectors.
Defective or loose spark plug - Spark plug need to be replaced or tightened.
Improper ignition timing - Set the ignition timing properly.
Valves are worn, burned or stuck - Change or service valves.
Worn sleeve, piston, or rings - Change faulty components.
Valve clearance is incorrect - Adjust valve clearance according to specifications.
Poor cylinder compression - Check cylinder block and change worn parts.
| Engine consuming too much oil |
Gaskets or seals may be damaged - Replace to repair leaks.
Damaged valve stems or valve guides - Need to replace the valves.
Piston rings are defective or worn - Have piston rings replaced.
Damaged cylinder liner or piston - Inspect piston and liner, change as required.
| Engine backfires |
Fuel injectors are clogged - Clean or replace fuel injectors.
Fuel lines clogging - Clean fuel lines.
Wrong ignition timing - Set the ignition timing properly.
Wrong valve setting - Valves needs to be adjusted properly.
Air filter is blocked - Clean or replace air filter.
________________________________________________________________________________________
________________________________________________________________________________________
| Engines Technical Specifications |