so i just had a new acd pump put in june at the dealer after mine failed @ around the 4 yr mark. 2 days ago, i started noticing a slight whining noise coming from the rear right of the car when i put it in reverse and hit the throttle. noise lasts maybe 4-5sec and then disappears. doesn't do it in 1st, and prolly can't hear it in 2nd+ as it's a faint sound.

i was on vacation the past 2 weeks and the car sat in my garage in toronto. is this the acd acting up again after 2 months? i only hear it once i apply throttle in reverse...no whine with reverse only engaged.

2008 evo x mr, 70,000km