I was driving when I saw someone pull over at an off-ramp, the worst sound I have ever heard resonating from their car.

I pull over to help, and they say something was wedged in the wheel. (I don’t think that is an accurate diagnosis). The owner walks over and starts the car, and all of the sudden, there it is. It sounded like hundreds of tortured souls trapped in an engine block, all of them screaming. It was a murderous sound coming from that car, and I have been trying to find out exactly what it was. I need a little help here, because I have never heard demons that bad from the engine.

Car: (2001 - 2012?) Chevrolet Malibu. (Not sure of the year exactly)

The sound started when the engine started, and seemed to correspond with the revs. Any help?

IF AT ALL POSSIBLE, LINK TO A VIDEO WITH THE NOISE AS AN EXAMPLE