2004 dodge Durango has a loud knock in engine. Had no knock before it sat for 3 weeks. On startup it began knocking. Problem???
hard to say with out hearing the knock, check the oil both level and color and smell if has burn smell. Best to transfer it to a mechanic you trust to avoid more damage.
Could also be the header gasket, check while engine is running if you can feel exhaust coming out between the engine and the header´s and also where the headers connect´s to the exhaust pipe.
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