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2000 Ford Explorer Question: I put a new the engine in my car 3 days ago and it make a knocking sound at star

 

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freddy.r66, 4.0L V6, Perris, CA, April 16, 2013, 08:05
 Rookie

when i start the car it makes a knocking sound and it goes away when it wearms up but if I let it sit for 1 hour and start it again it amkes the knocking sound what can be the problem

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