Knock when cold! 2008 2.3
like the title says I have a knock since the temperature has got cold! I'm having a hard time pin pointing it but does sound as if it's in the back of the head. As soon as the truck reaches full operational temperature it seems to go away. anyone ever experience this? Truck runs good just a "knock" sound that is present when cold. I've tried oil changes different oil grades 5w20 5w30 10w30 even pour Lucas in it thinner oil it's louder other than that oil has made no difference
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