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Sometimes at idle i can here a slight knocking from the engine that comes and goes. The truck runs strong and i get good Mpg and have no other symptoms.
It is not very loud as you can barely here it over the cackle of the motor and it comes and goes and at at hwy speed it is not there. There is no smoke unless i stomp on it.
Thank you for the advice. Just got back from a fishing trip and put 1990 miles and averaged almost 21 mpg driving at 1800 to 1900 rpms. Very happy being able to have grt HP and still be able to get good mpg if you want.
Thats cool CPS, thats some great mileage for a 8800 pound truck, people always say to me "Man,your mileage must be really bad huh." I get a kick out of telling them i get about 20ish give or take and the look i get!
Mine knocks when at operating temperature only(idle). I have found that it is the #8 injector. I have had people ask me if i have a lifter on the fritz. Going to do the fuel tank & Hpx mod and possibly swap out the injector if the mods don't cure it. Drives me nuts. Now that i am back from vacation it is time to get to work.