My motor recently developed a knocking sound from the top of the motor after getting an oil change and intake gasket replaced. It is not coming from the lower end of the motor but on top.
What is your question?
It sounds like a rod is knocking but it sounds like it is coming from the back valve cover
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Take it back to the repair facility and let them diagnose the noise before it causes more damage.If they are uncooperative ,take to a different repair facility.