Skip the auto shop - Our mechanics make house calls

Q: Car producing loud hum when accelerating, engine stalls before starting up

asked by on

Hello, during an oil change I was informed that my serpentine belt was almost due to be replaced. They told me that if the car started to make squealing sounds, I would definitely need it replaced. At the time I wasn't prepared to pay to have the replacement done so I told them I would have it done another time. I'm not sure if the noises I hear now are from the serpentine belt, but when I accelerate, it almost sounds as though the car is missing a gear and hums (almost like an airplane). Trying to go from stopped to going uphill also produces sounds...but it is more of a squealing than a hum. I am more than willing to get the belt replaced, but I'm wondering if it is the same problem. Turning the car on sometimes takes a minute or two before the engine rolls over to start (battery has just had recent maintenance). Any advice is appreciated

My car has 78000 miles.
My car has an automatic transmission.

A: I believe the humming sound you are hearing...

I believe the humming sound you are hearing could be related to a faulty wheel bearing. When wheel bearings dry out they will begin to make humming or growling noises when the vehicle is accelerating.

I would recommend having your wheel bearings inspected by a qualified mechanic, such as one from YourMechanic, to determine the cause of the humming sound.

As for the squealing sound, this could very well be the serpentine belt. I would recommend having that replaced as well if it is making noises or has cracks in it.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: A noise specific to the right front end

Hi there. Your Lincoln Town Car has something in the front related to the suspension called a sway bar. When you drive over bumps on potholes this helps to support the suspension as it does its job dampening the bump....

Q: I got in a fender bender roughly how much for new bumpers and hood and the repair

Hi there. Unfortunately, our mobile mechanics are unable to complete body repair. It's best to contact a local body repair shop or to work with your insurance company to receive a quote that is accurate for these repairs.

Q: Idle drop when clutch pushed in

Did you clean the carbon out of the rest the throttle body? I know these engines well. I suggest taking the throttle body off, removing the IAC (idle air control valve), TPS (throttle position sensor), and all other sensors. Soak...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...