BMW’s N55 engine, famed for its performance and reliability, can still throw you for a loop with a few issues. Delve into this guide to discover the 7 most common N55 engine faults, and learn how to diagnose and treat them.
1. The High-Pressure Fuel Pump (HPFP) Failures
Watch out for decreased fuel efficiency and difficulty starting the engine, as these could be signs of a failing HPFP.
2. Inefficient Water Pump and Thermostat
Overheating symptoms might indicate a problem with the water pump or thermostat, elements critical for managing engine temperature.
3. Worn Out Spark Plugs and Ignition Coils
Misfires, decreased power, and rough idling might suggest that the spark plugs or ignition coils need replacement.
4. Damaged Serpentine Belt
Listen for squealing noises, and be alert for power steering, A/C and alternator issues, which might hint at a damaged serpentine belt.
5. Carbon Buildup on Intake Valves
If experiencing rough idling or decreased power, inspect the intake valves for carbon buildup that can choke your engine.
6. Leaky Fuel Injectors
Fuel leaks and a strong fuel smell might point towards faulty fuel injectors.
7. Failing Vanos Solenoids
Look out for poor performance and degradation in fuel efficiency as these could be indicators of failing Vanos Solenoids.
Although it’s normal for the N55 engine to encounter these issues, regular maintenance can help avoid extensive damage and hefty repair costs.