hi can anyone tell me what the knocking sound comming from the top of the engine is, the truck has been driving like a dream for the past year but ihad a bad connection on the battery annd lost all power the other nite and when i got it going again there was a constant knocking or tapping sound coming from the top of the engine, would it do any harm to keep driving or do i need to get it looked at asap. any help much appreciated
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