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What causes a constant knocking noise in the engine on the drivers side?

(1999 Ford F-150)
in Terre Haute, IN on January 08, 2011
always while engine is running constant rythum.
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Popular Answer
on January 09, 2011
Knocking noises can come from several areas - main bearings, connecting rod bearings, valve train noises... A good technician ear can give you some direction.

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