Q: Engine noisy even after turning ignition off

asked by on

The engine is noisy, and even after I turn the ignition off I can hear engine noise for some time before it shuts down. And the steering wheel is shaky at higher speeds.

Hello, It looks like you are experiencing two different issues here with your Mazda 3. First, the shaky steering wheel at higher speeds is due to the the vehicle’s tires being out of balance. Taking your Mazda to the nearest tire shop for balancing is the quickest way to get this concern taken care of.

Now, from my experience, the symptoms your Mazda 3 is exhibiting with noise is something called dieseling. Dieseling occurs when the fuel inside the cylinder is being ignited without spark. This is associated with high compression, heat and fuel entering the combustion chamber. This interaction is very rare in modern fuel injected vehicles.

It is also possible that your cooling fans are continuing to run after you shut off your engine. A way to test this is to take the keys out of the ignition and listen for something running under the hood. Open the hood and look toward the passenger side of the engine where the serpentine belt is located. Verify if it is moving. If it is, then your engine is indeed continuing to run without a key and if you see the electric cooling fans by the radiator moving, this can be normal.

Sometimes these fans will continue to run to cool down the cooling system as well as a/c system (if you’ve been running the a/c) This would be more common hotter days. If however these are not the culprits behind the noise you are experiencing with your Mazda 3, then I feel it is best to enlist the help of a certified mechanic to diagnose exactly what is causing the engine noise and diagnose shaky steering wheel.

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. Engine noisy even after turning ignition off

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: How is the ESC manually turned off? Could I have done this by accident?

If the ESC light is on and you press the ESC button again and the light goes out then the button may have been inadvertently pressed and system turned off. If this happens then just press the button again to...

Q: Loose steering column - 1993 Saab 9000

There are 2 or more bolts which keep the steering column attached to the body structure under the dash. Possibly, these are loose, or worse, might have fallen out. This should be checked by a professional mechanic, like YourMechanic, before...

Q: The car shut off at the traffic light, difficulty accelerating

Hello there, ESP will generally not cause the vehicle to die. It sounds like you have a few issues with the lack of power, starting, and the car dying. A few items can cause all three of these. Most common...

Related articles

P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.