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| Home / Car Engines / Toyota Engines / Toyota 1JZ-GE |
Toyota 1JZ-GE Troubleshooting
| Engine will not start or hard to start |
No gasoline in tank - Fill fuel up.
Wrong grade of gasoline - Use quality gasoline.
Air trapped in fuel system - Bleed air.
Spark plug wire connection are damaged - Inspect the spark plug wire connection, replace or repair.
Spark plug is faulty - Replace spark plug.
Ignition system problems - Check ignition and replace faulty components.
Fuel filter is clogged - Fuel filter needs changing.
Fuel lines are clogged - Clean fuel lines.
Dirty or faulty fuel pump - Test fuel pump and replace if necessary.
Dirty or defective fuel injectors - Inspect fuel injectors and change as required.
Low compression - Check and replace worn parts.
| Engine runs roughly |
Ignition system malfunction - Check ignition and replace faulty components.
Clogged air filter - Replace or clean air filter.
Faulty spark plug - Replace spark plug.
Clogged or defective fuel pump - Clean or replace fuel pump.
Valve clearance is not correct - Check and adjust.
Improper ignition timing - Set the ignition timing properly.
Incorrectly adjusted low idle speed - Adjust the low idle speed.
| Engine starts and then shuts off |
Damaged spark plug - Change spark plug.
Fuel injectors are dirty or defective - Clean or install new fuel injectors.
Damaged ignition coil - Ignition coil must be replaced.
Loose or worn valve springs - Install new valve springs.
Stuck valves - Clean the valves.
| Engine overheated |
Engine oil insufficient - Checking oil level and add if necessary.
Engine overloaded - Reduce load.
Fuel injectors are clogged - Clean or replace fuel injectors.
Wrong ignition timing - Adjust ignition timing correctly.
Valve setting is wrong - Set the valves correctly.
Clogged radiator fins or leaking radiator cap - Change cap or clean radiator.
Lack of engine coolant - Add coolant fluid to cooling system and also check it for leaks.
Thermostat failure - Thermostat need to be replaced.
Water pump failure - Install new water pump.
| Abnormal engine noise or knocking |
Low octane gasoline - Use correct gasoline.
Engine is running overloaded - Reduce engine load.
Low engine oil level - Checking oil level and add if necessary.
Wrong adjustment of low idle speed - Correct idle settings.
Dirty or damaged fuel pump - Clean or install new fuel pump.
Main bearings or crankshaft wear - Repair or replace defective parts.
Improper valve clearance - Adjustment procedure required.
Damaged piston rings or cylinder bore - Replace defective parts.
| Engine lacks power |
Fuel injectors are damaged or dirty - Clean or replace fuel injectors.
Plugged air filter - Service or change air filter.
Fuel pump is dirty or defective - Test fuel pump and replace if necessary.
Ignition system malfunction - Check ignition and replace faulty components.
Damaged cylinder-head gasket - Change cylinder head gasket.
Valves are burned or stuck - Change or clean valves.
Faulty cylinder block components - Replace defective parts as required.
Oil filter element is plugged - Clean or change oil filter.
| Excessive fuel consumption |
Plugged air filter - Service or change air filter.
Fuel injectors are dirty or defective - Check fuel injectors and change if required.
Loose or faulty spark plug - Change or re-tighten spark plug.
Ignition timing is improper - Adjust ignition timing correctly.
Valves are stuck, burned, or worn - Replace or clean valves.
Worn sleeve, piston, or rings - Replace defective parts as required.
Incorrect valve clearance - Need to adjust valve clearance.
Poor compression - Inspect and replace wear parts.
| High engine oil consumption |
Damaged gaskets or seals - Install new components.
Valve guides and stems are worn - Valves need to be changed.
Piston rings are stuck or broken - Have piston rings replaced.
Worn piston or cylinder liner - Inspect liner and piston, replace as necessary.
| Engine backfires |
Dirty fuel injectors - Test fuel injectors and clean if necessary.
Clogged fuel lines - Fuel lines must be clean.
Wrong ignition timing - Adjust ignition timing as required.
Improper valve setting - Valves needs to be adjusted properly.
Plugged air filter - Replace or service air filter.
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