With all the reports of bad injectors on some 600's I decided to check mine yesterday. I started the engine and put my hand on each injector line. What I noticed is the front one ( I assume cylinder 1) has a very pronounced pulse, or banging, of fuel. Most of the others I almost felt nothing, just a slight vibration.

Is this normal or is there a better way to check them. I cant say I have any symptoms, other than some smoke on certain startups, but I'm not really sure what the engine is supposed to sound like.

John

 

My truck feels like that too. If I remember correctly, other people have said their fuel lines feel like that and it's normal. I think it has something to do with that injector line being on the end of the rail, farthest from where the fuel comes in.

 

Mine is the 03 but has a pronounced (lope) to it in sound only, kind of like a RV cam in a chevy 350 but the motor is smooth as butter, I was told that this was normal and that a couple of injectors were louder than the others. Im not sure if this is normal or not after reading these injector problems.