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| Home / Car Engines / Nissan Engines / Nissan HR12DDR |
Nissan HR12DDR Troubleshooting
| Engine starts hard or won't start |
No gasoline in tank - Fill gasoline up.
Wrong grade of gasoline - Change fuel.
Dirt and debris in fuel system - Remove debris and dirt.
Faulty spark plug wire connection - Inspect spark plug wiring connection, change or repair.
Damaged spark plug - Install new spark plug.
Ignition system malfunction - Check ignition system and replace faulty parts.
Fuel filter is clogged - Fuel filter needs changing.
Fuel lines are dirty - Fuel lines must be clean.
Fuel pump is clogged or faulty - Test fuel pump and replace if necessary.
Fuel injectors are faulty or clogged - Service or change fuel injectors.
Low compression - Check and replace worn parts.
| Engine runs roughly |
Defective ignition system - Inspect ignition system and change faulty parts.
Air filter is dirty - Service or replace air filter.
Faulty spark plug - Install new spark plug.
Dirty or defective fuel pump - Clean or change fuel pump.
Valve clearance is wrong - Check and adjust.
Wrong ignition timing - Set the ignition timing correctly.
Incorrect low idle setting - Adjust as required.
| Engine starts and stops suddenly |
Faulty spark plug - Replace spark plug.
Clogged or damaged fuel injectors - Check fuel injectors and replace if necessary.
Ignition coil is faulty - Install a new ignition coil.
Valve springs are worn or loose - Install new valve springs.
Valves sticking - Valves need to be cleaned.
| Engine overheats |
Engine oil level is insufficient - Fill up the oil to required level.
Engine overload - Reduce load.
Fuel injectors are clogged - Service or change fuel injectors.
Ignition timing is incorrect - Set the ignition timing correctly.
Valve setting is incorrect - Set the valves correctly.
Faulty radiator cap or dirty radiator fins - Clean radiator or change cap.
Coolant level is low - Fill the cooling system and check components for leaks or other faults.
Damaged thermostat - Replace thermostat.
Water pump malfunction - Change water pump.
| Engine knocks or noises |
Low octane fuel - Change gasoline.
Engine is overloaded - Reduce engine load.
Not enough engine oil - Add oil to the engine crankcase.
Low idle speed setting is incorrect - Need to adjust idle speed.
Fuel pump is defective or dirty - Check fuel pump and replace if necessary.
Main bearings or crankshaft failure - Replace crankshaft or bearings.
Valve clearance is not correct - Check and adjust.
Cylinder bore or piston rings are damaged - Replace defective components.
| Low engine power |
Fuel injectors are dirty or defective - Test fuel injectors and change if necessary.
Clogged air filter - Change or service air filter.
Dirty or faulty fuel pump - Clean or change fuel pump.
Ignition system failure - Inspect ignition system and change failed components.
Worn cylinder head gasket - Replace the head gasket.
Valves are stuck or burned - Replace or service valves.
Faulty cylinder block components - Replace defective components as required.
Oil filter is dirty - Service or change oil filter.
| Engine using too much gasoline |
Air filter is dirty - Service or change air filter.
Dirty or damaged fuel injectors - Inspect fuel injectors and change as required.
Spark plug is loose or faulty - Tighten or replace spark plug.
Incorrect ignition timing - Ignition timing needs to be adjusted correctly.
Valves are stuck, worn, or burned - Replace or service valves.
Sleeve, rings, or piston are damaged - Replace faulty parts as required.
Valve clearance is not correct - Check and adjust.
Bad engine compression - Inspect cylinder block and replace worn components.
| High engine oil consumption |
Defective seals or gaskets - Defective components must be replaced.
Valve guides and stems are worn - Install new valves.
Piston rings are seized or worn - Install new piston rings.
Damaged cylinder liner or piston - Inspect liner and piston, change as necessary.
| Engine backfires |
Fuel injectors are dirty - Service or replace fuel injectors.
Dirty fuel lines - Fuel lines need to be cleaned.
Ignition timing is incorrect - Ignition timing needs to be set properly.
Wrong valve setting - Adjust valves as required.
Clogged air filter - Clean or replace air filter.
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