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Quote:

Originally Posted by Roscoe03 (Post 458881)

2012's came with it. GM calls it Variable valve timing.

http://www.chevrolet.com/2012-silver...owertrain.html

Also if you have a DIC, you can switch it unitl it displays the V8/V4 mode and it will tell you as you're driving which mode you're in.

Dod and variable valve timing are 2 diff things. Dod shuts of cylinders, vvt adjusts cam timing

Quote:

Originally Posted by ccracin (Post 458846)

Check the oil level. Sounds simple, but!!!!!! My Dad's 07 has done this since new. When he first heard it he checked the oil and it was off the stick. In the end it used more than 3 quarts of oil in 3500 miles. He had an ongoing battle with GM about it. They kept trying to fix it kept burning oil. Here is a short list, new valve covers, new oil baffles, new breather parts, new valve guides and seals, and finally all new pistons and rings. Before he got to the pistons and rings he contacted a lemon law lawyer and got a settlement. He did not get a new truck because he did not report the issue soon enough. My advise is get it to the garage and get on record asap. They did the pistons and rings while his case was in progress. This seems to have mostly solved the issue. I can not tell how much of a pain it was to deal with. His truck is an 07 and he just got finished with the issue last summer. 4 Years! Good Luck!

What ever dealer u brought it to sucks. There was a bulletin in early '08 to replace the pistons and rings. I remember having a few discussions w/ gm engineering on getting this resolved. In early '08 we had string of trucks come in at least once a week with varing degrees of oil consumption.

Does anyone know if the newer engines had anything done to solve the piston slap issue the earlier engines had? All three of my gen 3 engines do it, don't know if it's still an issue with newer engines.

mabey its a exhaust leak check all the manifold bolt gm are notorious for them bolts to lossen up from time to time just saying gl man

Quote:

Originally Posted by Roscoe03 (Post 458881)

VVT and AFM or DOD are separate systems. The VVT is not related to the active fuel management systems. The DOD lifters are crap. This engine should be an L76, although it possibly could be a roll over LY6.

Quote:

Originally Posted by carkrazy1987 (Post 458920)

Dod and variable valve timing are 2 diff things. Dod shuts of cylinders, vvt adjusts cam timing

:faint: My apologies, thanks for setting it straight.

i belive that is an l96 motor.gm came out with a pip4978e bullitin for tick noise cold start.have had some oil pump problems built between 4/01/11 through 11/1/11.it is a lifter noise,but not a lifter problem.they have seen it on low milage motors.came out in feb 16 2012.hope that helps.IF that is the problem,the dealer would have to replace the oil pump. thx drew.

My 2012 does the same thing. Dealer said they could do nothing about it. I figure when it finally blows up I will know what the real problem is.

Rodger

Quote:

Originally Posted by ironworks (Post 459592)

My 2012 does the same thing. Dealer said they could do nothing about it. I figure when it finally blows up I will know what the real problem is.

Rodger

Take a vacation to south florida ill fix it, I need the work.:lol:

Quote:

Originally Posted by andrew5 (Post 459569)

Thanks, I will check the build date and get with the dealer. Thanks to everyone for the replies too!

I have an 08 1/2 ton (5.3)with 130000 miles on it, great truck,no problems but I've always had lifter noise at cold start up, at this point I think it's just a characteristic of the LS engines.