Skip the auto shop - Our mechanics make house calls

Q: Just bought a used Forester that started rattling when I'm not accelerating and the wheel is straight. Any ideas on what it could be?

asked by on

When the car is started and there is no acceleration I can sometimes hear a rattling noise coming from the right side of the car, between the engine and the wheel somewhere. If I accelerate at all the noise goes away. Also, It only seems to rattle if the wheel is straight, most the time turning the wheel one way or another reduces or eliminates the sound. The noise is there regardless of gear, but when going from N to R or to D the rattling sometimes gets quieter while gears are changing but returns to normal intensity once the gear is set. (Sometimes the noise is uneffected by gear changes) The car also pulls very slightly to the right. And... If I turn the AC on I do notice a change in the rattle, but can't tell if I'm just noticing additionally noise from AC. Regardless though the rattling doesn't happen ever when I'm accelerating

My car has 150000 miles.
My car has an automatic transmission.

A: Hey there. The most common source of rattle...

Hey there. The most common source of rattles on Subaru’s are the exhaust heat shields. They can rattle under all sorts of random circumstances. Whenever you turn, accelerate, let off the gas or brake, the motor experiences torque that is dampened by the engine mounts so the passengers won’t feel these vibrations. This torquing will affect the exhaust as much as any other component on the car. Checking for exhaust shield rattles is fairly simple. Use a soft mallet hammer to tap on the shields to see if it rattles. If it does, repairing this is more challenging than locating it. It’s a creative process that can only be decided in person. Of course, you will need to get under that car to access all of the shields.

Other than the exhaust shields, it could be a dust shield on the brakes or a sway bar end link. Both of these are far less common as determined by your description of your symptoms. If it is a sway bar end link, it will rattle most often when you go over bumps. If it is the brake dust shield, you will need to remove the wheel to see if the shield is loose.

If you need further help having this done, a certified professional from YourMechanic can come to your car’s location to diagnose the rattling noise so that this can be corrected.

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: When I start the starts right away but when I put gas it does go it will go like 10mph I donot know what wrong with it

Hello. This can be caused by a few things. If the engine is revving fine but the vehicle does not move then this can be a transmission failure. If the engine is not really even revving well then it may...

Q: Clutch won't go into gear

Having difficulty moving into first gear and then being unable to move your Subaru into any other gear leads me to believe that there are problems with one or more components in the clutch system. While the information you offered...

Q: Unresponsive wheels accompanied by grinding and shuddering - 2015 Acura TLX

Hi! That seems to be a very unsual issue on a vehicle with such low miles. I'm curious what the Acura dealer service department said about this. Being that your TLX is so new and covered under warranty, I suggest...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
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.