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2006 5.9 runs smooth, idles great, 17-19 city, 21-23 highway. Good power and acceleration.
Engine is noisy, Has a loud knocking sound from the front of the engine with all kinds of background noise like stirring a tub of baleing wire with a crowbar is the best way to describe it. Dealer downloaded newest soft ware which helped a little but did nothing for the noise. He said it runs on 3 cylinders until warm but it stays noisy even when warmed up. Had the valves ran and they are good. Next to a friends 2006 which purrs instead of clanks there is no comparison. I am tired of cringing every time I drive it. Any suggestions?:CRY:
 

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I think some are just louder than others. My 05 is soooo much louder than my friends 07 5.9. They are worlds different.
 
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