Skip the auto shop - Our mechanics make house calls

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.

A: Hello, It looks like you are experiencing t...

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?

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: At slow speeds the ABS kicks in when breaking. I'm on dry pavement. Is the speed sensor or hydraulic brake booster pump at fault?

Hello. Most of the time this is caused by a wheel speed or a yaw sensor issue. I would start by checking the tires. Make sure that they are all the same. If one of the tires is different than...

Q: Top of steering shaft inside wheel sounds dry when turning how do you fix it?

It sounds like your steering clock spring in the column for the air bag and steering wheel controls is binding or getting ready to break. I recommend having the steering wheel inspected by a mechanic who can verify the problem...

Q: What Is Included in an Engine Inspection?

Engine inspections are an integral part of any engine repair or diagnostics visit. They can also be a separate visit to get a general condition of an engine, like in a pre-purchase inspection or a safety check inspection. The inspection...

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 Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...