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Thumping sound under hood?

dlittle

New Member
Joined
February 27, 2010
Messages
8
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City, State
MN
Year, Model & Trim Level
'02 Explorer V8 Limited
about 3 miles into the drive a loud thumping sound started to come from under the hood. as we went faster the thumping got faster too but didn't change much when it shifted gears. at idle the engine sounded like it wanted to die, but thumping continued slowly. when the gas was applied we would accelerate but as though there was half power. we could hear the thumping more when sitting in the car than sticking my head out the window.
 




dlittle

New Member
Joined
February 27, 2010
Messages
8
Reaction score
0
City, State
MN
Year, Model & Trim Level
'02 Explorer V8 Limited
oops forgot to mention, 2002 4.6l v8, limited
 




Merc02

Well-Known Member
Joined
January 24, 2008
Messages
100
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Year, Model & Trim Level
2002 Mountaineer 2wd V8
if its louder in the vehicle than out, it may be internal, but check the easy stuff first, like the belt and any thing that it turns like the alternator, ac, power steering pump and pulleys.

noise and loss of power sounds bad, maybe a broken valve spring and valves are hitting the pistons as they come up?
 




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