Hey guys, my 02 is making a whining noise that is directly related to throttle pressure. As you gain speed you start to hear it and it grows louder and louder. It's just like a whining/whistling noise.

On the highway it is the loudest, but if you take your foot off the gas it goes away, but immediately returns once you press the pedal again.

Ideas?

 

When did you last check the condition/level of the TC oil?

 

Recently has the gasket replaced..

 

I'd check axle fluid levels, or drain fluid into a clean drain pan and look for foreign material. Normally, when you have a vibration/noise under acceleration...it is a sloppy input or output shaft flange (being caused by worn bearings). Jack up the rear and try and move the input flange/pinion shaft up and down or side to side. There are a lot of moving parts in this drivetrain system, so you may have to look high and low for the issue.

Brian.

 

Check the hoses that run off of the intake tube, the IACV. If you any kind of leak they’ll make an interesting sound. Common area to leak/break is the nipple on the air intake tube itself.

If it’s gear whine = check transfer case fluid.

 

And any of these symptoms would cause a whine ONLY when the throttle is engaged? It immediately disappears when I let off the gas.

 

More air into the engine when the throttle is opened & more gear whine under load.

 

Pulley bearings.