My 2008 Sierra 1500 5.3 has had oil consumption issues since 50,000 miles. Dealers ran around problem and did bandaid fixes and I had to drive it for work, out of warranty now. 120,000 miles, slight tick the last few days and this morning I'm going to pass this old lady and felt almost a bang or pop, I was almost to work so i limped there, Engine running rough and almost feels like it could die at stop light, Check Engine Light Flashing, Stabilitrak and Traction Control lights came on too. Went into limp home mode. Checked Oil: good. Unhooked battery to reset for awhile: restarted and everything came back. So I took it to Advance auto to check codes, P0306 - #6 cylinder misfire. So I buy a spark plug/ set of spark plug wires, and ignition coil. Old spark plug covered in oil: replaced: no change. Plug wire and coil don't make any difference either. Re-check new spark plug, Oily.

Dealer confirmed no compression in Cylinder 6. Said I need a new Engine. $8000. Any opinions on this? They should have replaced engine before warranty went out, but they danced around it as I racked up miles and added oil each time I got gas...

Would it be possible to just add and AFM/DOD delete kit with a non AFM cam? My guess is #6 lifter is collapsed with possible cam damage. Would this have put enough metal shavings through the motor to ruin it?

Got my first kid coming soon and I do not have $8000 to spare but Im decent with a wrench.

Any chance GM would replace the motor?

Thanks!

 

Get a take out motor from a junk yard, craigslist or ebay. Might also try bitching to GM corporate and see if they might be willing to help.

 

Im really sorry to here that. If talk to delership managment and show them all the times u put in the shop they may help out. If not got to their facebook page and blast em. My friend had a problem with a toyota tacoma thats how he got his problems taken care of out of warranty. Just be carefull what u say. Put all the detales out on the page. GOOD LUCK.

 

I have an 08 silverado 5.3, I just did the dod delete and replaced the cam to fix my issues. Mine did the same thing other than the oil comsuption, I also didnt check compresson. The engine check light flashed and the stabilitrak light was flashing followed with a loud clanking. In my case a lifter tray failed allowing the lifter to turn sideways and grind down the roller and the cam. I replaced everything and it runs great now. If I were you I would tear it down and look either way it needs to come apart or come out.

 

I would start with pulling the heads off and figure out the damage. You may not need a complete motor. If you do, pick one up from a junkyard. I got a 65k mile 5.3 complete intake to oil pan with a harness and computer for under $800.

 

Failed lifter. My friend's 07 Avalanche did the exact same thing and he pulled the heads and replaced all the lifters. Runs great now. I would do dod delete tho

 

Keep us posted on what u find out or get done

 

same thing happened to my 08 Avalanche. Swapping to an E-bay 6.2L

 

If there is a problem withat the active fuel management and one of the cylinders it deactivates, it will cause a misfire on the problem cylinder.