Q: Can't Figure Out Engine Noise

asked by on

Hi there! For the past 6-8 months, I've noticed that my car sounds like it's working really hard to do the things it used to do with ease. I have no difficulty or delay in starting the vehicle, but once it's on, there's a loud, low-pitched roar/grumble/growl type of sound, coming from the alternator area under the hood. It happens when I start the car, the car is idling, and especially when I am accelerating. No noise on braking, turning, or coasting. There is no vibration or funny smells. I drive this car about 150 miles every day, to and from school. I have had transmission fluid & filter replacement and flush recently, I use fuel injector cleaner every 3,000 miles, I have the oil changed every 2 months exactly, my battery appears to be in good shape, I just got new tires, and I've never been in a collision in this car. Shocks and struts have been replaced before so they shouldn't be worn, water pump was replaced recently, and all fluid levels are maintained carefully. I'm lost!

My car has 112000 miles.
My car has an automatic transmission.

Typically, I would perform an initial diagnosis by disconnecting the serpentine belt and operating the engine for a minute. That belt drives a lot of devices that can make a lot of noise and thus a whole collection of possibilities can be dealt with quickly in one fell swoop. If by chance the noise does go away by eliminating all belt-driven devices, then you know the noise is from a belt driven accessory or pulley and it’s easy to trace from there. If the noise remains, the I would have a certified technician, such as one from YourMechanic, diagnose the noise in person so that this can be addressed appropriately.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Can't Figure Out Engine Noise

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: Why my 2003Trial Blazer Truck Acc ingestion switch don't work

The switch contacts in that position may be faulty although it is also possible that the circuit wiring through that position, and/or a relay, are faulty. To resolve this will require tracing the relevant circuits, and testing the switch, too,...

Q: I'm trying to replace my antenna assy coil from the ignition area inside of the car where the key goes. Do u know of a video on it

The best place to look for videos on automotive repairs would be Youtube.com. I know that there is a guy from 1A Auto who is often on there filming various repairs being done to show people how to do them....

Q: After replacing alternator I have the abs and traction lights on.never on before

The alternator going bad while driving caused the other systems in the vehicle to get low on supply voltage and they may set codes in memory for power loss. You may need to clear the codes in all the modules...

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...
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...
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...