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Originally Posted by Philcracco
I test drove a used 2001 4.4 with 35k miles and sensed a vibration/hum at about 5000 rpm when the engine was under heavy load (like hill climb). It seemed to come on suddenly and go away just as quickly as it passed 5000 rpm. My question is - could this be something that is typical of this year/engine or might this particular problem. Any notions what that problem might be?
thanks for any ideas.
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How intense was the vibration/hum. If it did not seem that bad, then I would say it was normal however my 2004 4.4 does not do this, but it is a slightly different engine than the 2001.