Q: Car makes what I would describe as a helicopter noise under the hood when I step on the gas; it's worst when changing gears.

asked by on

What is the rattling noise coming from my engine? I drove 500 miles from Boulder to Salt Lake yesterday, and when I got here, I noticed a rattling sound coming from the engine when I accelerate. It gets quieter once the gear has shifted, then gets louder again before shifting into the next gear. At idle, my engine sounds normal, with no rattling. When I got to SLC, I checked my oil and nothing showed up on the dipstick, so I put in 3 quarts of oil. What is the most likely problem here? Rod knock? Lifters? Wrist pin knock? And what would a repair likely cost? (I.e. Is the car now junk?)

My car has 179200 miles.

Hi there. If you added three quarts of oil to your engine, it is very likely that you may have internal engine damaged; possibly in the cylinder head hardware like lifters; as that is what typically makes a constant clicking noise when they are loose, damaged or not properly lubricated. The question that needs to be answered is how did your engine lose 3 quarts of oil in the first place. Usually older engines will ’burn’ oil, but at a very slow rate. I think before you attempt to drive back to Boulder or any longer trips, you should have a professional mechanic come to your location and complete a car is making a noise inspection, so they can determine what is causing the noise. Hopefully it will be something easy to fix like a damaged drive or serpentine belt pulley.

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. Car makes what I would describe as a helicopter noise under the hood when I step on the gas; it's worst when changing gears.

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: Replaced master/slave cylinder and clutch pedal is hard as a rock and won't depress what could it be?

You need to open the bleeder on the slave cylinder to see if the clutch can be pressed down? If it still cannot be pushed down then the problem is in the clutch master cylinder and it is binding. If...

Q: Transmission replacement cost

A complete, re-manufactured transmission for your car would cost about $2,000 plus the labor cost to install it. Inasmuch as your car has only 130,000 miles, if you are having transmission problems, it might be possible to repair your existing...

Q: How do I replace the remote keyless entry transmitter battery?

The remote keyless entry transmitter battery usually lasts for a few years. If the battery dies, you can easily replace it by following these steps: 1. Use a narrow tool to pry open the center cover of the transmitter. 2....

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...
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...
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...