What Causes Abnormal Noises in BMW Engines?
2 Answers
BMW engines may produce abnormal noises due to idle conditions or cold idle with a ticking sound, which significantly reduces or disappears after the engine warms up. Below are solutions for BMW engines with ticking sounds: Idle: Regardless of whether the engine is cold or warm, or the gear position, a ticking sound occurs at idle and can be heard both inside and outside the vehicle. For BMW models, a common cause of this issue is vibration from the high-pressure fuel rail. This can usually be resolved by replacing the high-pressure fuel rail with one that has a damping pad. Cold Idle with Ticking Sound: In this case, the issue is typically related to the hydraulic lifter (HVA). If the ticking sound occurs only occasionally, it may be due to insufficient oil supply to the hydraulic lifter during short trips in extremely low temperatures, which can be resolved by taking longer drives. If the ticking sound occurs frequently, the hydraulic lifter should be replaced.
As someone who frequently repairs cars, I've seen many BMW engines develop abnormal noises. The most common causes are loose or worn-out belts, which produce a sharp squeaking sound; it could also be damaged internal bearings in the engine, resulting in a metallic grinding noise; sometimes, insufficient lubrication due to low or poor-quality oil can worsen friction noises. First, check the oil dipstick to see if the oil level is normal; then start the car and listen to locate the noise—whether it's from the front belt area or internal components. If the abnormality persists, use a diagnostic tool to read the fault codes. Don't delay too long—minor issues left unfixed can escalate into engine damage, with repairs costing thousands to start. Safety first: ensure you have all the necessary tools before attempting repairs or simply take it to a shop. Regular oil changes and maintenance can prevent 80% of such issues, especially since BMW engines have higher maintenance requirements.
