Hum when hill climbing.
I've recently noticed a slight hum when running uphill on the highway. It seems to happen only is the grade is enough (or the uphill is long enough) that I start to lose speed. I'll drop about 1mph and then I can hear a quite hum sort of like I'm running on rumble strips on the edge of the highway but barely audable. The hum will suddenly dissapear when I crest the hill. The funny thing though is that there is no change in RPM or indication that the trany is downshifting.
What is up with that?
I think I can hear it now only because of the new intake. It doesn't make the engine sound much different at highway speed really, but I seem to be able to pick out this sound now whereas before it was too muffled.
Bump for my post, but additional info as well. Driving yesterday, and being hyper attentive, I noticed that at the same time as I hear the hum I can also feel a slight vibration through the floorboards. The condition causing this hasent changed, I just noticed the similtaneous vibration. Again it's not bad, barely noticable, but it's there.
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