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Home / Car Engines / Toyota Engines / TOYOTA 4A-FE

Toyota 4A-FE Troubleshooting

Engine Model: Toyota 4A-FE

Engine Type: 4-cylinder 16-valve DOHC gasoline engine

Total Displacement: 116.5 cu.in (1.6 L)

Rated Engine Power: 105 Hp (78 kW) at 5800 rpm

Fuel System: EFI or MPFI

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Engine is not starting or hard starting

Gas tank is empty - Fill gasoline up.
Improper fuel grade - Change gasoline.
Clogged fuel system - Remove clogging.
Defective spark plug wire connection - Inspect the spark plug wire connection, replace or repair.
Spark plug is defective - Spark plug need to be replaced.
Ignition failure - Check ignition and replace faulty components.
Fuel filter is dirty - Replace fuel filter.
Restricted fuel lines - Fuel lines must be clean.
Fuel pump is faulty or clogged - Service or replace fuel pump.
Fuel injectors are faulty or clogged - Check fuel injectors and change if required.
Low compression - Check and replace worn parts.

Engine runs intermittently

Ignition system problems - Check ignition and replace faulty components.
Air filter element is plugged - Change or service air filter.
Faulty spark plug - Install new spark plug.
Fuel pump is damaged or dirty - Clean or change fuel pump.
Valve clearance is wrong - Need to adjust valve clearance.
Ignition timing is wrong - Adjust ignition timing as required.
Improperly adjusted low idle speed - Correct idle adjustment.

Engine starts but then stops

Faulty spark plug - Spark plug need to be replaced.
Clogged or defective fuel injectors - Service or replace fuel injectors.
Ignition coil is damaged - Ignition coil should be replaced.
Valve springs are broken or bad - New valve springs need to be installed.
Valves sticking - Valves must be cleaned.

Engine is overheated

Engine oil level low - Check and refill engine oil.
Engine overloaded - Load reducing is recommended.
Fuel injectors are dirty - Clean or replace fuel injectors.
Wrong ignition timing - Adjust ignition timing as required.
Wrong valve setting - Set the valves correctly.
Clogged radiator core or damaged radiator cap - Change cap or clean radiator.
Not enough coolant - Add coolant fluid to cooling system and also check it for leaks.
Defective thermostat - Change thermostat as required.
Water pump failure - Replace water pump.

Engine knocking or noise

Stale gasoline - Use proper gasoline.
Engine is under excessive load - Load reducing required.
Engine oil level low - Fill the crankcase with engine oil.
Incorrectly adjusted low idle speed - Adjust idling as required.
Fuel pump is dirty or defective - Clean or install new fuel pump.
Crankshaft or main bearings are worn out - Change or repair worn components.
Improper valve clearance - Check and adjust.
Damaged piston rings or cylinder bore - Replace faulty parts.

Engine loses power

Fuel injectors are faulty or clogged - Clean or replace fuel injectors.
Clogged air filter - Clean or change air filter.
Fuel pump is damaged or dirty - Test fuel pump and replace if necessary.
Ignition system malfunction - Inspect ignition system and change faulty parts.
Cylinder head gasket is worn - Replace cylinder head gasket.
Stuck or burned valves - Replace or clean valves.
Faulty cylinder block components - Replace defective parts.
Oil filter element is clogged - Clean or replace oil filter.

Excessive fuel consumption

Clogged air filter - Clean or replace air filter.
Fuel injectors are dirty or defective - Test fuel injectors and replace if necessary.
Defective or loose spark plug - Replace or tighten spark plug.
Improper ignition timing - Adjust ignition timing correctly.
Worn, stuck, or burned valves - Service or change valves.
Worn piston, rings, or sleeve - Change defective parts.
Improper valve clearance - Adjustment procedure required.
Bad engine compression - Inspect cylinder block and replace worn components.

High oil consumption

Seals or gaskets are wearing excessively - Install new components.
Valve guides and stems are worn - Install new valves.
Stuck or worn piston rings - Install new piston rings.
Cylinder liner or piston is scored - Check piston and liner, install new parts as required.

Engine backfires

Fuel injectors are dirty - Clean or replace fuel injectors.
Restricted fuel lines - Fuel lines must be clean.
Improper ignition timing - Adjust ignition timing as required.
Valve setting is improper - Adjust valves correctly.
Air filter is dirty - Change or service air filter.

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