Whirring noise from engine area - increases with acceleration

The belt tensioner on right side of engine, if you are facing vehicle, just below the altenator, is probably the problem. Mine made the noise all the time, bought part at Autozone, 18.99, its fixed, no noise.

A rod problem is a steady knock which increases with rpm. More likely you have a plugged air filter , a plugged fuel filter or a vacuum leak, ( vote fuel filter , people never change those often enough)

It is possibly the fan clutch.

I had the same problem. I replace the Catalitic(spell check) converter replaced and my envoy was back to going like normal.

If the noise increases when idling and reving up the engine then you must check on the engine pulley, the belt idler pulley, the water pump , alternator or the a/c. But if the noise increases when you are moving then you must check on the wheel bearings, the drive shafts and the inspection of the mudguards for tyre rubbing. If so you will have to jack up the car and check for faulty bearings, drives or tyres. SInce the noise can be traced to the point of generation , you will have to have a friend also to check on one side for pinpointing the sound and identifying the part. This must be easier to find and you can easily replace/repair/change the part concerned. Hope you try. Good day

does it sound like a jet engine when increasing the rpms if so it most likely the fan clutch has locked up and needs replaced.

check for vacuum leak

Yep, That was it. i followed a link to trailvoy.com and found a video with the same noise and links to how to repair. My husband fixed it yesterday and the noise is no more!! Good Luck..

I would guess it is the electronic fan clutch. It will cause the fan to run too fast (very loud) and the light will come on sometimes.

You have a faulty thermostatically controlled fan clutch. Same thing happened to mine. As soon as you start the car, the fan is always turning, and the speed increases as the RPM is increased.