Quote:
Originally Posted by wwomanC6
We only hear it when its in gear. Goes away When put in park.
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Try door # 3, tell us if the noise is there or not in neutral. (there is a difference)
A4 cars have different engine idle speeds depending on if "in gear", or "park/neutral". Based on your description, my inclination is that it's probably not something rotating, but is making noise by resonating at the lower idle RPM frequency which happens only when in gear.
You can test this easily, with the car on the ground, by placing the car in Drive, holding your foot on the brake, and giving it just a LITTLE throttle to bring the RPMs up off normal idle some (at/near/not over 1000 RPM). Does the noise remain or disappear? Or does it get worse?
And if you find there is a difference between park and neutral, it would quickly point to the tq converter, even though the resultant noise would likely be heard downstream.
