I have a 2007 Ford Ranger that makes a faint howling sound when I'm accelerating, usually after being idle at a stoplight. I've tried slowly revving in neutral and I didn't hear the same noise. Definitely is something out of the ordinary, I know what my truck should sound like. Started today. What could it be?
94k miles
5 speed Auto-tranny
2.3 liter 4 cylinder
UPDATE: Ok, weird. I had to take my truck to the shop anyways for an oil change, and I asked them to take a look at the problem that I'm having and explain how to reproduce it and everything. Turns out they couldn't find the problem or reproduce it and now, neither can I. Could an oil change really be the difference in that noise or not?