________________________________________________________________________________________
| Home / Car Engines / Toyota Engines / Toyota 3VZ-FE |
Toyota 3VZ-FE Troubleshooting
| Engine starts up hard or will not start |
Gas tank is empty - Fill it up.
Incorrect fuel grade - Use quality fuel.
There is air in the fuel system - Bleed the system.
Disconnected or loose spark plug wire - Check spark plug wiring connection, repair or change.
Spark plug is defective - Replace spark plug.
Ignition system malfunction - Inspect ignition system and change failed components.
Fuel filter is plugged - Replace fuel filter.
Fuel lines are dirty - Fuel lines must be clean.
Fuel pump is clogged or faulty - Service or replace fuel pump.
Fuel injectors are dirty or defective - Inspect fuel injectors and change as required.
Low cylinder compression - Check cylinder block and replace worn parts.
| Engine runs irregularly |
Ignition system failure - Inspect ignition system and change failed components.
Dirty air filter element - Service or change air filter.
Spark plug is defective - Change spark plug.
Clogged or damaged fuel pump - Clean or change fuel pump.
Incorrect valve clearance - Check and adjust.
Incorrect ignition timing - Adjust ignition timing as required.
Low idle speed setting is incorrect - Adjustment required.
| Engine starts but then shuts off |
Spark plug is damaged - Change spark plug.
Clogged or defective fuel injectors - Clean or install new fuel injectors.
Faulty ignition coil - Install a new ignition coil.
Valve springs are weak or broken - Valve springs need to be changed.
Stuck valves - Valves need to be cleaned.
| Engine overheats |
Not enough engine oil - Add oil to the engine crankcase.
Engine is overloaded - Load reducing required.
Clogged fuel injectors - Service or change fuel injectors.
Bad ignition timing - Ignition timing needs to be adjusted correctly.
Valve setting is incorrect - Set the valves properly.
Radiator core is dirty or radiator cap is damaged - Clean radiator or replace cap.
Lack of engine coolant - Refill to the correct level and inspect system for leaks.
Thermostat is faulty - Change thermostat.
Water pump is defective - Change water pump.
| Engine knocking or noise |
Stale gasoline - Change gasoline.
Engine overloaded - Load reducing required.
Engine oil level is insufficient - Add oil to the engine crankcase.
Low idle speed adjustment is incorrect - Adjust as required.
Dirty or faulty fuel pump - Clean or install new fuel pump.
Worn crankshaft or main bearings - Have bearings or crankshaft replaced.
Valve clearance is incorrect - Adjust to proper valve clearance.
Worn piston rings or cylinder bore - Replace defective parts.
| Engine loses power |
Fuel injectors are damaged or dirty - Clean or replace fuel injectors.
Air filter element is plugged - Change or service air filter.
Fuel pump is faulty or clogged - Clean or replace fuel pump.
Ignition system is defective - Check ignition system and replace faulty parts.
Cylinder head gasket is damaged - Install new head gasket.
Valves are stuck or burned - Change or service valves.
Damaged cylinder block parts - Defective components need to be replaced.
Oil filter is dirty - Change or service oil filter.
| Excessive fuel consumption |
Plugged air filter - Replace or service air filter.
Fuel injectors are dirty or defective - Clean or replace fuel injectors.
Spark plug is loose or defective - Spark plug need to be tightened or replaced.
Wrong ignition timing - Ignition timing needs to be set properly.
Stuck, burned, or worn valves - Replace or clean valves.
Worn sleeve, piston, or rings - Replace faulty parts as required.
Excessive valve clearance - Adjust valve clearance.
Bad compression - Check and change damaged parts.
| High engine oil consumption |
Worn gaskets or seals - To repair leaks, replace worn parts.
Valve stems or guides are damaged - Need to replace the valves.
Stuck or worn piston rings - Install new piston rings.
Damaged piston or cylinder liner - Inspect piston and liner, fit new components as necessary.
| Engine backfires |
Clogged fuel injectors - Test fuel injectors and service if necessary.
Dirty fuel lines - Fuel lines must be clean.
Incorrect ignition timing - Set the ignition timing correctly.
Wrong valve setting - Adjust valves correctly.
Air filter element is clogged - Replace or clean air filter.
________________________________________________________________________________________
________________________________________________________________________________________
| Engines Technical Specifications |