My 2006 Toyota Corolla makes kind of a wheezing sound under the hood once it's running. It's hard to describe - it's kind of a higher-pitched, continuous sound. Is this a common issue? Any ideas to what it might be? I thought maybe it was a belt, but I took it into a mechanic and he couldn't tell what was wrong. Sorry for my lack of a better description....
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Backpressure is the result of any obstruction in exhaust flow. Both the converter and muffler create a certain amount of backpressure by design. If the cat becomes plugged, exhaust cannot properly escape and can cause an extreme lack of power. (Engine can't draw in what it can't expell out the other end) Usually the rotten egg smell is also accompanied by a "wheezing" sound in the cat as well.
You sure its the transmission? Wheezing sound is usually the catylitic converter becoming plugged. Also...at 3-5K rpm you are not idling, you are reving the engine...(in that case, trans may be slipping or flairing between shifts, unless the unit is staying in one gear and just delaying shift till you reach that rpm. actual shift point should be close to 2,000rpm) I'd check the cat first.