Loud humming noise only when idling - 2001 Camry
This is happening when it's in gear or in park. The minute I accelerate, it stops. Background: I changed the alternator a couple of months ago and I did experience some intermittent "squealing" for a while upon turning over the engine, but only if the A/C was on. If I turn on the A/C when I'm at idle it doesn't seem to get better. or worse, but does make a kind of "hiccup," noise and then the humming seems to be a little different pitch. The humming seems to be coming from somewhere around the crankshaft pulley area... but, I'm not sure.