Weird intermittent engine noise. Whirling/Popping under Acceleration/Revving | Ford Explorer Forums

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Weird intermittent engine noise. Whirling/Popping under Acceleration/Revving

452films

Member
Joined
September 12, 2009
Messages
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City, State
Southern Maine
Year, Model & Trim Level
'99 XLT
I have a 99 Sport 4.0 OHV auto. I first noticed the intermittent ( usually more so than not ) noise when I was driving. Under acceleration, sometimes at only 2500rpms, other times at higher rpms, it makes a loud whirl that gets louder than makes a pop noise and goes away and does it again and again until you let off. Recently I've noticed it doing it ( less often than when in drive, i think ) while in neutral.

I originally thought it was the auto4wd turning on, but now that it does it in neutral im stumped.
 






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