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| Home / Car Engines / Toyota Engines / Toyota 2AZ-FE |
Toyota 2AZ-FE Troubleshooting
| Engine starts up hard or won't start |
No gasoline in tank - Fill gasoline up.
Improper fuel grade - Change fuel.
Clogged fuel system - Remove clogging.
Spark plug wire is loose or disconnected - Check spark plug wiring connection, repair or change.
Faulty spark plug - Install new spark plug.
Ignition system malfunction - Check ignition and replace faulty components.
Fuel filter is clogged - Replace fuel filter.
Fuel lines are dirty - Clean fuel lines.
Fuel pump is faulty or clogged - Clean or change fuel pump.
Dirty or damaged fuel injectors - Service or replace fuel injectors.
Low compression - Check and replace worn parts.
| Rough engine running |
Defective ignition system - Test ignition and replace failed parts.
Air filter element is clogged - Change or clean air filter.
Spark plug is damaged - Spark plug need to be replaced.
Dirty or faulty fuel pump - Check fuel pump and replace if necessary.
Valve clearance is improper - Adjust to proper valve clearance.
Improper ignition timing - Set the ignition timing correctly.
Low idle speed setting is incorrect - Test and adjust.
| Engine starts and immediately shuts off |
Faulty spark plug - Change spark plug.
Dirty or damaged fuel injectors - Service or change fuel injectors.
Damaged ignition coil - Ignition coil should be replaced.
Damaged or weak valve springs - Change valve springs.
Valves sticking - Service the valves.
| Engine keeps overheating |
Not enough engine oil - Need to add engine oil.
Engine is under excessive load - Load reducing required.
Fuel injectors are clogged - Test fuel injectors and clean if necessary.
Ignition timing is improper - Adjust ignition timing as required.
Valve setting is wrong - Valves needs to be adjusted properly.
Defective radiator cap or clogged radiator fins - Install new cap or clean radiator.
Coolant level is low - Top up coolant fluid and check system for leaks.
Defective thermostat - Change thermostat.
Water pump malfunction - Change water pump.
| Engine knocking or noise |
Stale gasoline - Change gasoline.
Engine overloaded - Reduce the load.
Engine oil level low - Need to add engine oil.
Low idle speed setting is not correct - Adjust the low idle speed.
Dirty or defective fuel pump - Test fuel pump and replace if necessary.
Crankshaft or main bearings are worn out - Need to install new components.
Valve clearance is incorrect - Adjust valve clearance according to specifications.
Piston rings or cylinder bore are damaged - Change defective components.
| Engine power loss |
Fuel injectors are clogged or faulty - Test fuel injectors and replace if necessary.
Plugged air filter - Replace or service air filter.
Fuel pump is damaged or dirty - Service or change fuel pump.
Ignition failure - Test ignition and replace failed parts.
Damaged cylinder-head gasket - Change cylinder head gasket.
Valves are stuck or burned - Change or clean valves.
Worn cylinder block parts - Defective components need to be replaced.
Clogged oil filter - Replace or clean oil filter.
| High fuel consumption |
Dirty air filter element - Clean or change air filter.
Fuel injectors are dirty or defective - Test fuel injectors and change if necessary.
Spark plug is defective or loose - Re-tighten or replace spark plug.
Wrong ignition timing - Set the ignition timing correctly.
Valves are stuck, burned, or worn - Replace or service valves.
Worn sleeve, piston, or rings - Replace defective parts as required.
Improper valve clearance - Adjust valve clearance according to specifications.
Low cylinder compression - Check cylinder block and replace worn parts.
| Engine using too much oil |
Seals or gaskets are wearing excessively - Change worn parts according to specifications.
Valve stems or guides are damaged - Change the valves.
Piston rings are defective or worn - Piston rings replacement required.
Cylinder liner or piston is damaged - Check piston and liner, install new parts as required.
| Engine backfires |
Fuel injectors are clogged - Test fuel injectors and clean if necessary.
Restricted fuel lines - Fuel lines need to be cleaned.
Improper ignition timing - Set the ignition timing properly.
Improper valve setting - Set the valves correctly.
Air filter is blocked - Change or clean air filter.
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