Skip the auto shop - Our mechanics make house calls

Q: Car makes a metal rattling sound when stepping on the gas. It has gotten worse over time?

asked by on

A few weeks ago, I noticed a slight rattling/ticking sound coming from the engine when I stepped on the gas. I would let off of the gas and it would immediately stop. Then I would step on the gas again and the car would accelerate normally with no unusual sound. However, I always seem to notice a burning smell around the same time all of this happens. Over time, the noise has gotten louder and more constant. Now I hear it when I first step on the gas and continue to hear it while my foot is on the gas. When I take my foot off of the gas, the sound slows and stops but the sound is heard every time I step on the gas now. The first few times I step on the gas while driving, I still get that burning smell that accompanies the sound. I scanned my car to see if it was kicking any codes and got nothing. On October 19th, I got my brake pads, rotors, the front left caliper, and the drive belt & drive belt tensioner replaced. Any Ideas as to what is causing the rattling? Thanks!

My car has 164000 miles.
My car has an automatic transmission.

A: Hi there: There could be multiple issues c...

Hi there:

There could be multiple issues causing the rattling noise when you accelerate on your Mazda 6 ranging from a loose bracket, to an exhaust pipe that is cracked or even the serpentine or drive belt system that's causing these symptoms. It's also possible that motor mounts are starting to show signs of wear. The only way to really know for sure what's causing this issue is to have a local mobile mechanic complete a car is making a noise inspection.

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: leaking steering fluid what cost to repair

Hi Roger, Thank you for your question. We'll be glad to provide a quote if you know exactly which repair needs to be performed. If not, we'd recommend scheduling an inspection. Our mobile mechanic will diagnose your vehicle...

Q: Radiator fans not working and car overheats while idle

The radiator fans have three different relays in the relay box in the engine compartment and they are all controlled by the Engine Control Module (ECM). The system has a low and high speed fan that is controlled by the...

Q: The car is driving jerky in speed after a vacuum pump was put in

I would recommend having a complete vacuum leak test done. Chances are that there is still a leak after installing the new vacuum pump, which could be causing the jerky sensation that you have described. A vacuum leak can easily...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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.