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: Car sputters and dies

Hello. It will first be necessary to find out why the Check Engine Light is on. This could be the reason your car is stalling. It is also possible that the is a problem with the fuel system, as this...

Q: Yaw sensor needs replacement

Hi there. Yes, the sensor, along with the dependent systems, require what is called a "zero point" calibration when it is replaced. The dealership does not have to be the entity that performs this calibration. However, it is dependent upon...

Q: How do I check the washer fluid?

Your washer fluid will periodically need to be replenished. As such, you should periodically check the fluid levels in the washer tank. To do so, follow these steps: 1. Open the hood. 2. Locate the washer fluid reservoir. 3. Make...

Related articles

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...
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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...