Skip the auto shop - Our mechanics make house calls

Q: engine sound

asked by on

When i accelerate on pass the 40mph, the car engine makes a weird grinding sound and when i let go of the gas it stops, when i keep it steady the car makes not grinding sound, only when i accelerate

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

A: This sounds like the engine is having pre-i...

This sounds like the engine is having pre-ignition. There can be more than a few caused for the problem. The engine pings from the engine running lean or the ignition timing being advanced. The first thing to check would be to scan the computer to see if any codes are present and diagnose and fix them as needed. If there are no codes to be addressed then look at the mass air sensor reading with the key on and the engine off, to see what the barometer reading is. If the sensor is not reading the correct altitude then replace the sensor. When this sensor is not reading correctly the computer may think you are above 10000 ft in altitude and will not set a code or give enough fuel and pings.

If you need some assistance with this, contact a certified mechanic who can perform the necessary checks to accurately diagnose the sound of your engine and make the necessary repairs to your vehicle.

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: How do I turn quiet start on or off?

When your car is started via the remote start button, the horn will honk to confirm that the vehicle has been started. When the quiet start feature is turned on, the horn will not honk, and the climate control fan...

Q: Back wheels lock up when put into drive

This symptom is common on vehicles with a drum style mechanical parking brake assembly behind the disc brake rotor. Worn components can cause the assembly mounting to become loose allowing for extra movement. This extra movement usually binds the assembly...

Q: My 2004 Honda Civic is making too much noise. Why and how would I address the issue?

Hi there. Assuming the noise is a high-pitched squeal when the A/C is turned on, it may be that the new belt has stretched and needs to be readjusted. The A/C compressor may also be failing, causing the belt to...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...