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Certified Automotive Diagnostic Technician. I noticed a rattling noise (like marbles) coming from the engine upon startup in the morning only. The whine in my '13 3.6 is not exactly like the one in the video, but I'm 99% sure mine is coming from the center support bearing on the propeller shaft. 2 days ago, loud humming/whirring sound started coming from the rear end of the car. Apr 2, 2017 The whine in my '13 3.6 is not exactly like the one in the video, but I'm 99% sure mine is coming from the center support bearing on the propeller shaft. Is this normal.. The serpentine belt is responsible for driving numerous components of the vehicle. The transmission filter is located inside the crankcase. Indeed, if this loud noise does not occur when you iddle, it is surely in connection with your transmission, and, in general, to your wheels. You will need to identify if this noise takes place abruptly and if it can stop as it started. Make sure you gather all of the parts needed before you get started. ('01-'02) - Whining noise when accelerating - Subaru Forester Owners Forum However, checking the transmission fluid is a fairly simple job in most car models and should be done anyway. If the problem is the alternator, you can try installing a noise filter between the alternator and the battery or installing an inline noise filter in the head unit power cable. If you have a friend with you, the process might be easier. The alternator belt is a wearing part that is used to bring power to the secondary components of your Subaru Outbacks engine and although it is less vital than the timing belt it can bring about engine failure if it fails. This is why I decided to start writing honest and dependable articles on how to improve or fix cars, and review auto-related products. It could also be due to a power steering issue, worn bearing or low engine oil. High-pitched hissing while the car is running is often a sign of a leak in a vacuum line, hose, or fitting, and it can be accompanied by a rough idle (idling is when the engine is running at its . I usually start Hi there. Transmission is very smooth and on inspection of th cvt fluid and diff fluid everything is clean without any metal shavings on the drain plug magnets. Transmission is very smooth and on inspection of th cvt fluid and diff fluid everything is clean without any metal shavings on the drain plug magnets. Some of these parts may whine all the time, while others are more noticeable during acceleration. The most common cause is the state of your bearings, so remember to check their condition to be sure it is not the cause of this loud noise when you accelerate. It is immediately assimilated to an engine motor issue and can therefore be critical. Once the crankcase is out, check if there are metal shavings. Flat rate pricing based on labor time and parts, Hand-picked, community-rated professionals, Trusted mechanics, rated by thousands of happy car To test it, you just have to see if you have more difficulty than usually shifting gears, if you feel a resistance either stronger or non-existent in the clutch pedal. My Subaru is Humming! What is the sound it makes when parked?