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| Home / Car Engines / Toyota Engines / Toyota 2AZ-FSE |
Toyota 2AZ-FSE Troubleshooting
| Engine difficult to start or will not start |
Fuel tank is empty - Add fuel.
Wrong fuel grade - Change gasoline.
Air trapped in fuel system - Bleed air.
Spark plug wire is disconnected or loose - Inspect the spark plug wire connection, replace or repair.
Spark plug is defective - Change spark plug.
Ignition system malfunction - Inspect ignition system and change failed components.
Clogged fuel filter - Install new filter.
Dirty fuel lines - Clean fuel lines.
Dirty or faulty fuel pump - Service or change fuel pump.
Dirty or defective fuel injectors - Service or replace fuel injectors.
Low engine compression - Inspect cylinder block and change defective components.
| Engine runs unevenly |
Ignition system failure - Check ignition system and replace faulty parts.
Plugged air filter - Replace or clean air filter.
Spark plug is faulty - Change spark plug.
Dirty or damaged fuel pump - Service or change fuel pump.
Valve clearance is wrong - Check and adjust.
Incorrect ignition timing - Adjust ignition timing correctly.
Incorrectly adjusted low idle speed - Correct idle adjustment.
| Engine starts and then shuts off |
Damaged spark plug - Change spark plug as required.
Clogged or defective fuel injectors - Service or change fuel injectors.
Faulty ignition coil - Ignition coil must be replaced.
Valve springs are worn or loose - New valve springs need to be installed.
Valves sticking - Service the valves.
| Engine is overheated |
Insufficient engine oil - Check and refill engine oil.
Engine is under excessive load - Load reducing required.
Fuel injectors are dirty - Inspect fuel injectors and service as required.
Wrong ignition timing - Adjust ignition timing as required.
Wrong valve setting - Set the valves correctly.
Radiator fins are dirty or radiator cap is defective - Install new cap or clean radiator.
Engine has a lack of coolant - Fill radiator to proper level and check components for faults.
Thermostat failure - Replace thermostat.
Water pump failure - Replace water pump.
| Abnormal engine noise or knocking |
Stale gasoline - Use correct fuel.
Engine overload - Reduce load.
Engine oil insufficient - Need to add engine oil.
Low idle speed setting is not correct - Adjust idle speed.
Fuel pump is dirty or defective - Clean or change fuel pump.
Main bearings or crankshaft failure - Have bearings or crankshaft replaced.
Valve clearance is improper - Adjust valve clearance.
Worn cylinder bore or piston rings - Change defective components.
| Engine power loss |
Fuel injectors are damaged or dirty - Test fuel injectors and replace if necessary.
Air filter is dirty - Change or service air filter.
Fuel pump is clogged or faulty - Service or change fuel pump.
Ignition system malfunction - Inspect ignition system and change failed components.
Worn cylinder head gasket - Install new head gasket.
Valves are burned or stuck - Change or clean valves.
Cylinder block components are faulty - Replace defective components.
Oil filter element is plugged - Service or change oil filter.
| High fuel consumption |
Dirty air filter element - Clean or replace air filter.
Fuel injectors are damaged or dirty - Check fuel injectors and replace if necessary.
Spark plug is loose or defective - Spark plug need to be replaced or tightened.
Ignition timing is incorrect - Adjust ignition timing correctly.
Valves are worn, burned or stuck - Service or replace valves.
Sleeve, piston, or rings are damaged - Change faulty parts.
Incorrect valve clearance - Adjust valve clearance.
Low cylinder compression - Check cylinder block and replace worn parts.
| Excessive engine oil consumption |
Worn seals or gaskets - Replace to repair leaks.
Valve stems and guides are worn - Need to replace the valves.
Stuck or defective piston rings - Install new piston rings.
Worn cylinder liner or piston - Inspect piston and liner, fit new components as necessary.
| Engine backfires |
Fuel injectors are clogged - Inspect fuel injectors and service as required.
Dirt in the fuel lines - Fuel lines need to be cleaned.
Ignition timing is wrong - Adjust ignition timing as required.
Incorrect valve setting - Set the valves properly.
Air filter element is plugged - Service or replace air filter.
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