Loud Hummmmm when cold-starting | Ford Explorer Forums

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Loud Hummmmm when cold-starting

chuckwagon101

Well-Known Member
Joined
July 10, 2007
Messages
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City, State
Texas
Year, Model & Trim Level
1999 Explorer sport
I have a 1999 Ford Explorer Sport .

When I first start the vehicle, there is a LOUD hum under the hood. Not gentle but RAUCOUS!

I can feel the vibration when I lift the hood and put my hand on the air intake tube coming from the air filter. The sound seems to come from the center of the engine.

It is a 6 cylinder SOHC 4 wheel drive.

It has been doing this for about 2 weeks. When the engine warms up after about 5 minutes the sound diminishes and then stops completely. It only does it from a stone-cold start. When warmed up there is no Hum.

Any idea what I should check for?

Thanks, Chuckwagon
 






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