Injector noise or not?

[michiganmax]

Hi I am new to the forum world and having a Duramax. I just picked up a 01 lb7 Duramax. The motor has a knocking sound that shows up when you take off. It is there when you give it gas. It sounds like it is coming from the drivers side. I have had it go away while driving it, then next time I am in it, it's back. The truck runs smooth at an idle with a little smoke out the tail pipe. I get 17 mpg on the hwy. not sure if that's good or bad. The truck is a ext. cab 4x4. I previously owned a 12v Cummins, so I am used to a loud motor. But I don't think this motor is supposed to make that noise. So I am not sure if it is a injector or a lifter nose. If anybody out there could give me some input, I would really appreciate it. Thank you


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[1ATony]

If you post this over in tech, you might get a quicker reply.

Tony

 

[Dmax87]

I would say its injector noise. Lb7's are known for it. The smoke you speak of is more than likely an injector goin south. There are a few ways to check them to give yah an idea as to which one is the problem child check your balance rates. Also on the noise try a good fuel additive. I use the performance formula from stanadyne I have found this does quiet mine down a bit. Welcome to the forum by the way :thumb:

 

[Kat]

Same here http://www.duramaxdiesels.com/forum/showthread.php?t=57493