I just bought a 2006 dodge with the 5.9L H.O. It has what seems to be a knock or rattle at a idle down low. The rythim of the rattle does not seem to go with a rodknock and will go away with a few RPM. It has 130k on it but I thought a cummins was good for more than that. Has anyone experienced this or know of anything that can cause this noise?

 

Sounds like you might need to add some outboard oil to your fuel. I put 1oz per gal fuel. The low sufer fuel. When it was 500 parts you had good lub 15 part is very low lub.You need to read up on this it will help you===Good luck

 

i have been putting atf in mine it lubes the pump plus surrounds water you might have a fuel knock

 

Its a Cummins, they make alil noise, its alllllllll good

 

ATF was not meant as a fuel additive! The TWC-3 out board is.You can get it at Wal-mart.

 

2 stroke oil seems to work well as well

 

I mix 8 ounces of Marvel Mystery Oil into 16 ounces of Power Service Silver; makes a 24 ounce bottle, I run about 12 ounces per tank.

 

TWC-3 is a stroke oil only a beter grade.

 

lucas fuel stabilizer, diesel fuel supliment, kerosene, 2 stroke oil is what i use year round

 

Mine does the same and it only has 26000 miles on it. I run PS/MMO mix and it does not help. Apparently the CP3 injection pump can be re-timed by moving the position of the gear in relation to the drive gear in the engine and that helps a lot of people get rid of the knock. I may pay someone to perform that procedure for me in the next couple of weeks. Apparently it's no problem but it just doesn't sound right to me.....

DO NOT put ATF in your fuel system!!!!!!