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| Home / Car Engines / BMW Engines / BMW M50B20 |
BMW M50B20 Troubleshooting
| Engine won't start or difficult to start |
No gasoline in tank - Fill fuel up.
Low-quality gasoline - Change gasoline.
Air in fuel system - Bleed fuel system.
Defective spark plug wire connection - Check the spark plug wire connection, repair or replace.
Spark plug is defective - Spark plug need to be replaced.
Ignition system problems - Inspect ignition system and change failed components.
Plugged fuel filter - Install new filter.
Restricted fuel lines - Fuel lines must be clean.
Dirty or damaged fuel pump - Service or replace fuel pump.
Fuel injectors are faulty or clogged - Clean or replace fuel injectors.
Poor engine compression - Check cylinder block and replace damaged components.
| Irregular engine running |
Ignition system failure - Inspect ignition system and change failed components.
Air filter element is plugged - Clean or replace air filter.
Defective spark plug - Replace spark plug.
Clogged or damaged fuel pump - Test fuel pump and replace if necessary.
Valve clearance is incorrect - Adjust valve clearance according to specifications.
Ignition timing is wrong - Ignition timing needs to be set properly.
Low idle speed adjustment is incorrect - Adjust the low idle speed.
| Engine stalls after starting |
Spark plug is faulty - Change spark plug as required.
Fuel injectors are faulty or clogged - Test fuel injectors and change if necessary.
Ignition coil is defective - Install a new ignition coil.
Valve springs are worn or loose - Install new valve springs.
Valves sticking - Valves must be cleaned.
| Engine overheating |
Lack of engine oil - Check and refill engine oil.
Engine overloaded - Reduce load.
Fuel injectors are dirty - Inspect fuel injectors and service as required.
Wrong ignition timing - Ignition timing needs to be set properly.
Incorrect valve setting - Valves needs to be set correctly.
Dirty radiator fins or faulty radiator cap - Replace cap or clean radiator.
Lack of coolant in cooling system - Add coolant fluid and inspect the cooling system for leaks.
Thermostat is defective - Change thermostat as required.
Damaged water pump - Install new water pump.
| Engine knocks or noises |
Stale or low octane fuel - Change fuel.
Engine overloaded - Reduce engine load.
Engine oil level is low - Add oil to the engine crankcase.
Incorrect low idle setting - Adjust the low idle speed.
Clogged or damaged fuel pump - Clean or replace fuel pump.
Worn main bearings or crankshaft - Need to install new components.
Valve clearance is wrong - Adjust valve clearance.
Damaged piston rings or cylinder bore - Change faulty parts.
| Engine lacks power |
Fuel injectors are faulty or clogged - Test fuel injectors and change if necessary.
Air filter element is plugged - Clean or replace air filter.
Dirty or faulty fuel pump - Inspect fuel pump and change as required.
Ignition system malfunction - Test ignition and replace failed parts.
Blown cylinder head gasket - Change cylinder head gasket.
Valves are stuck or burned - Clean or change valves.
Cylinder block components are damaged - Change defective components.
Oil filter is dirty - Replace or clean oil filter.
| Engine uses too much fuel |
Dirty air filter element - Replace or clean air filter.
Dirty or faulty fuel injectors - Test fuel injectors and replace if necessary.
Defective or loose spark plug - Tighten or replace spark plug.
Bad ignition timing - Adjust ignition timing correctly.
Valves are worn, stuck, or burned - Service or replace valves.
Sleeve, rings, or piston are damaged - Replace faulty parts.
Valve clearance is not correct - Adjust valve clearance.
Engine has low compression - Check cylinder block and replace defective parts.
| Engine consuming too much oil |
Defective seals or gaskets - Replace defective parts.
Damaged valve guides or valve stems - Replace defective valves.
Piston rings are stuck or worn - Piston rings need to be replaced.
Damaged piston or cylinder liner - Inspect piston and liner, fit new components as necessary.
| Engine backfires |
Fuel injectors are clogged - Inspect fuel injectors and service as required.
Restricted fuel lines - Clean fuel lines.
Improper ignition timing - Adjust ignition timing correctly.
Valve setting is improper - Valves needs to be adjusted properly.
Air filter element is plugged - Clean or replace air filter.
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