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So mine just started doing this at 45,000 miles.
I'm seeing everything from "air injection pump" to broken vacuum seal - as everyone said, only at start-up. Changes in pitch with RPMs. I popped the hood to check it out before I left my place, but couldn't place it - can't replicate it unless it's been sitting undriven for a while, so can't do it until the following morning.
I refuse to believe it's "normal" if it hasn't started happening until now. If it's a broken vacuum seal, I shold be able to find it, if it's just air rushing through a hole. I'll check it out and report back, as it seems like no one's found a definite answer for this problem and I've spent the past one hour reading up online about it.
But it happens to a lot of cars, just by reading online.
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