Bring it in to the dealer. Have em look at it. I have had a few bad lifters in new trucks. LY6 engine does not have afm. If is a 2500hd most likely LY6. Could also be bad oil pump or incorrectly installed oring. I am a heavy line tech for gm dealer and seen all these problems. Also u mentioned ur truck is a '12 model. Being we are now on the '13 there is a possibility ur truck has been sittin on the lot for a while. A simple oil change may solve the problem.
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1960 Chevy C10 Apache
1969 Chevy Nova
2007 Chevy TBSS
Last edited by carkrazy1987; 01-18-2013 at 06:01 PM.
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