Skip the auto shop - Our mechanics make house calls

Q: Humming/whirring sound only when accelerating.

asked by on

I drive a 2001 manual toyota echo. It makes several noises, the most concerning being when I am pressing the gas there's a whirring or humming noise coming from the front of the car. There's also a noise like some one is jumping on an old bed when I brake. The A/c also stopped working after I heard a loud pop while driving, and the belt sqeals if my batter is weak and early in the morning. I don't know if any of this is related, but I'm curious as to what the noise that happens when I only accelerate may be. The car's in the shop now and the mechanic "thinks" it's the wheel bearing I had replaced a couple years back. This is my first time at this mechanic and he didn't the day after I dropped my car off like he said he would, I called a week later and he said he'd call back and never did, so there isn't a lot of trust.

A: It is possible that you have a wheel bearin...

It is possible that you have a wheel bearing issue. It is usually worse when cornering in one direction and gets better when turning the other direction if it's just one bearing.

The brake noise could be the return spring for the brake pedal or the pivot point for the pedal needs lubricating. It is also possible that the brakes need replacing, and that a component called a squealer is making that noise to alert you to the worn brakes.

The belt needs to be tightened. When your battery is low, it puts a load on the alternator causing the alternator to be harder to turn. With a loose belt, it slips until it can gain traction and accelerate the alternator to the engine speed. Early in the morning, dew or moisture can collect on the belt and contribute to the belt slipping.

If you would like this to be checked by a certified pro, an expert from YourMechanic can come to your location to diagnose the noises that are being exhibited and can assist you with the proper repairs for this.

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・Save up to 30%

Get a quote

What others are asking

Q: Engine knock and bad sounds on start

Since you describe your issue happening when you first start it cold, I’m assuming the noise goes away shortly after starting. When your engine is running, the internal components are literally floating on oil that is constantly pumped and supplied...

Q: "TRAC OFF" light came on after diagnostic test for check engine light

Hello. In most cases the vehicle's traction control system is on a completely separate circuit then that of the engine knock sensor. Therefore most knock sensor faults or issues should have little to no effect on the operation of the...

Q: Engine hesitates when warm - 1997 Toyota Tercel

Hi there. As you already know, replacing components without diagnoses can be expensive and time consuming without resolution. A few things come to mind concerning the lack of performance. First, camshaft timing needs to be checked. When the engine is...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.