Weird Noise
#1
Weird Noise
I have the 4.6L and I'm noticing this weird high pitched moan/humming. It only happens if I'm on the highway or a straight stretch. When I let off the gas it does it for maybe 3 seconds and then if I hit the gas again it happens. It sounds like it's coming from the back of the truck. I was thinking maybe the factory exhaust or the rear end. Any ideas? It's driving me crazy!