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Discussion Starter #1
I came across this on another forum. Does anyone know if there is any truth to this?

"The fuel pump and injectors are calibrated into the computer with a certain trim code and if they do not match they will make the engine have a slight knock...if that's the case then it shouldn't hurt anything....it's just something cummins did to reduce noise in the CR's."

Reason I ask is I have had a slight knock since I replaced my injectors. I bought a set of F1 injectors off the shelf from Power by Poole. He happened to have a set already made. I then in turn sent my injectors to Don M. So to say the least my injectors are not the ones that were originally in my truck. This knock will come and go. Sometimes its really noticable and other times you can barely hear it. It doesnt matter if the truck is programmed to stock or not. I have had my overhead adjusted checked sensors, etc.. It's driving me nuts!!!!
 

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Discussion Starter #3
Makes me feel a little better. :) What does your truck sound like and under what conditions? I dont think its anything critical atleast not yet. The truck runs really good. I can only hear the knock at idle and light throttle but after that it sounds fine. Its also kind of ebarrasing when your at a light and you can hear the knock bouncing off other cars. i know people probably hear it and thinkthat thing sounds like poop.
 

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Discussion Starter #5
Believe me it really bothers me too! Do you think its noisy injectors, fuel knock, timing? I dont think its timing since it will do it with or without the smarty. Almost sounds worse stock.
 

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I think what your hearing is the actualy detonation of the fuel much like the older jerk style injectors of the past. only difference is the pilot injection to help quiet things down.

your injectors flow a bit more fuel than the stockers so you are getting more fuel into the cylinders quicker.
 
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