[chevyboymjb]

I have a 03 with 63,000 on it all stock, driving down the road it started to knock. No codes, no smoke, no loss of oil pressure, knocks when accelerating and idle, does not knock when coasting until rpm get down under 1000, the knock is up high in the engine.Seems to run ok except at idle it shakes and sounds like a miss out the tailpipe has any one had a similar problem.

 

[Diesel Nut]

Sounds like a bad injector to me. Pretty common on LB7 motors. Take it to the dealer, injector warranty is 200k miles.

 

[chevyboymjb]

Thanks i'm fixing on taking it Mon. I had my suspisions that's what it was but not positive.

 

[Diesel Nut]

Good luck!

Let us know how it goes.

 

[chevyboymjb]

turns out it was an injector. The dealer said there was a $100 deductible for the warranty.

 

[ob_1jr]

I wouldn't complain about that. You might even get GM to send that 100 back to you if it meets the criteria of the special policy 04039. Either way, at least the dealer didn't give you a hard time about it.