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You need to be more specific in your question. What year/make/model and engine size/configuration do you have? If you dont know this then just take it in. Does it knock at idle? Hard acceloration? Decceloration? Only when cold? Only when hot? Info like this is very valuable when trying to diagnose a problem, but i would first look at your rotating assembly. (aka crankshaft, rods, and pistons) One or more bearing may have excessive clearance, the wrist pins may be scored, etc. The easiest way too look at it is to take off the oil pan and visually inspect everything.
Wiki User
∙ 16y ago
Wiki User
∙ 11y agoCould be many reasons,
High mileage (worn out bearings),
Poor or no maintenance (oil & filter changes),
Abuse,
Could also be a spark knock (pinging),
Excessive piston cleareance(worn, piston slap)/cracked piston skirt can cause a knock noise.
All of which are signs of major damage/repairs needed or potential damage if left unchecked.
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