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Topic Review (Newest First)
02-05-2018 08:25 AM
lefty Got her all back together and she runs like a champ.
02-01-2018 11:10 AM
cmntmxr57
Quote:
Originally Posted by lefty View Post
So after pulling the engine apart I found about a half of quart of oil in the intake. The drivers side valve cover and everything under it had a layer of shit all over everything. The passenger side was clean. Pulled driver side head off, had a bent pushrod on Cyl 1, (Piston face has no marks so I think it was just because the lifter locked up) and it had a thick layer of carbon/oil all over in it and in the exhaust port and manifold.
I'm surprised it wasn't throwing a code earlier with all the buildup in it. Ordered new lifters, lifter trays and pushrods for that side, new valves and seals for Cyl 1 and a new valve cover(according to the TSB it had a bad baffle that was letting oil through) and all gaskets to put it back together. Cleaned the intake, head and piston faces and now I'm waiting on the valve stem seals to put it back together. All together I'm into this repair for about $350 in parts and it will be about 14ish hours of time.
Being only one cylinder and probably not severe enough, it wouldn't trigger. There is a certain threshold for misfires within a certain amount of crankshaft rotation to trigger.
02-01-2018 09:25 AM
DEEZUZ Ah nice.


Next time do a compression check before disassembly, that way you can not only see where an issue is, but know if you have to go deeper if you didn't find anything obvious
02-01-2018 09:20 AM
lefty
Quote:
Originally Posted by CTC DEEZUL View Post
I'd really hate to put this all back together and find out rings are shit too
HOW DARE YOU!!!! LOL, That thought was in the back of my mind. But the exhaust valve seat was caked on the head and the valve which was letting liquid past it with the head off and I think the stem seal went bad from all the crap caked to everything in the exhaust side if that cylinder. I did put that Berryman chemtool stuff in the cylinders with the head off and nothing really seemed to leak through so I'm keeping my fingers crossed that I dodged a bullet with that one.
02-01-2018 08:55 AM
DEEZUZ I'd really hate to put this all back together and find out rings are shit too
02-01-2018 08:00 AM
lefty So after pulling the engine apart I found about a half of quart of oil in the intake. The drivers side valve cover and everything under it had a layer of shit all over everything. The passenger side was clean. Pulled driver side head off, had a bent pushrod on Cyl 1, (Piston face has no marks so I think it was just because the lifter locked up) and it had a thick layer of carbon/oil all over in it and in the exhaust port and manifold.
I'm surprised it wasn't throwing a code earlier with all the buildup in it. Ordered new lifters, lifter trays and pushrods for that side, new valves and seals for Cyl 1 and a new valve cover(according to the TSB it had a bad baffle that was letting oil through) and all gaskets to put it back together. Cleaned the intake, head and piston faces and now I'm waiting on the valve stem seals to put it back together. All together I'm into this repair for about $350 in parts and it will be about 14ish hours of time.
01-03-2018 09:37 AM
lefty
Quote:
Originally Posted by Ti28 View Post
GM, won't do a thing until it burns so much in a time frame. Pretty simple, as explained by owners manual. Check all fluids at fuel up.

I got 85k on my 5.3 DOD and I burn next to nothing, I use a dyno 10w30 and change it at 3k miles. Stop listening to the OE when you're supposed to change your oil. 10k on a oil change is bullshit!
I'm not expecting GM to do anything as its an 08 and I'm way past the 5yr powertrain warranty. I never had any problems with it until 93k miles and the oil gets changed at least every 3k miles on all my vehicles, or 1 time a year if I cant put on 3k miles in a year on it. I'm debating leaving out the oil pressure sending unit filter and looking into just putting the regular lifters in it if I have to replace any of the AFM lifters. I'm also looking into other ways I can disable it without a tune considering everything I'm finding says no one tunes them.
01-02-2018 10:07 PM
Ti28 GM, won't do a thing until it burns so much in a time frame. Pretty simple, as explained by owners manual. Check all fluids at fuel up.

I got 85k on my 5.3 DOD and I burn next to nothing, I use a dyno 10w30 and change it at 3k miles. Stop listening to the OE when you're supposed to change your oil. 10k on a oil change is bullshit! They care nothing about how long your engine lasts, to them it's all about meeting EPA standards.
01-02-2018 09:57 PM
lefty Well apparently none of the handheld tuners work on the hybrid to turn the AFM off, nor does some other thing that plugs into the OBD port that turns it off. I'm going to pull the intake and clean it, replace the stupid oil pressure filter, mod the left valve cover to move the hole for the PCV system and throw a catch can on this weekend and see if that helps with the consumption.
01-02-2018 04:48 PM
blakbearddelite When I had the G8, I thought about doing the DoD delete. But since I'm not savvy enough to do it myself, I would have had to pay like $2k+ to do it. I'm glad I never did.
01-02-2018 03:24 PM
RICH17 This thread and the other are hte only times i have really heard of these motors eating oil like that.


Also, dlete that shit.
01-02-2018 01:54 PM
boostedguy05
Quote:
Originally Posted by daturbosix View Post
GTFO... and here i thought it was DOD(shutting down lifters) and then AFM(variable cam timing)
https://en.wikipedia.org/wiki/Active_fuel_management

Active Fuel Management (formerly known as displacement on demand (DoD)) is a trademarked name for the automobile variable displacement technology from General Motors. It allows a V6 or V8 engine to "turn off" half of the cylinders under light-load conditions to improve fuel economy. Estimated performance on EPA tests show a 5.5%-7.5% improvement in fuel economy.[1]

GM's current Active Fuel Management technology uses a solenoid to deactivate the lifters on selected cylinders of a pushrod V-layout engine
01-02-2018 10:57 AM
daturbosix GTFO... and here i thought it was DOD(shutting down lifters) and then AFM(variable cam timing)
01-02-2018 10:43 AM
boostedguy05
Quote:
Originally Posted by daturbosix View Post
is that a DOD engine as well as AFM?
those are the same thing. GM just changed the name to sound more ECO.
01-02-2018 09:59 AM
Yaj Yak
Quote:
Originally Posted by daturbosix View Post
is that not a 6l80 in that?


weirdass hybrid trans as @lefty states
01-02-2018 09:58 AM
Yaj Yak i was glancing at this the other day, and i really think it comes down to AFM...

my 6.0 in my truck is a 2013, with 145k miles, and it uses about a quart between DIC oil changes which are typically around 7-8k miles... i use synthetic.

my 2007 4.8 sierra used about that much as well. but also, like my 3500, does not have AFM.

nothing like what you guys are experiencing.
12-31-2017 02:50 PM
lefty 2ML70, Which I figure is weaker than a stock 4L60E lol. I'm sure a newer auto will bolt in, but then I have to get a stand alone. I have to keep the hybrid system because the steering, brakes and the AC is tied into it.
12-31-2017 02:24 PM
daturbosix
Quote:
Originally Posted by lefty View Post
I've thought about that, and throwing a power adder on it because of all the room under the hood, but I figure the trans is the weak point and I don't know of any performance upgrades to that. Plus I like the gas mileage of it and I already have a toy
is that not a 6l80 in that?
12-31-2017 02:18 PM
Bruce Jibboo and here I thought only the German motors consumed oil
12-31-2017 02:17 PM
lefty I've thought about that, and throwing a power adder on it because of all the room under the hood, but I figure the trans is the weak point and I don't know of any performance upgrades to that. Plus I like the gas mileage of it and I already have a toy
12-31-2017 01:46 PM
daturbosix delete all that crap.
cam swap time!
12-31-2017 01:27 PM
lefty I started getting oil pressure issues, apparently there is a filter under the pressure sending unit that needs to be changed. I also fouled a couple spark plugs which is why I started looking into it more
12-31-2017 12:52 PM
1quick
Quote:
Originally Posted by willizm View Post
I see alot of consumption on my 2010 escalade with the 6.2 and AFM. Literally I'll put 6 qts in and only get 3 qts out when it comes time for oil change. Nothing is leaking but I attribute it to the AFM issue as it seems to be rather common. No issues with the truck and it's got right under 140k miles.
Thatís how my 5.3 in my trailblazer was, except that one time I was at a toll booth and was like damn that diesel truck next to me is loud, it pulled away and the sound stayed, it was my lifters clacking the thing couldnít have had more than like 2 quarts left in it, I put 2 in it and it wasnít even touching the dip stick yet
12-31-2017 12:49 PM
willizm I see alot of consumption on my 2010 escalade with the 6.2 and AFM. Literally I'll put 6 qts in and only get 3 qts out when it comes time for oil change. Nothing is leaking but I attribute it to the AFM issue as it seems to be rather common. No issues with the truck and it's got right under 140k miles.
12-31-2017 11:10 AM
Shibby50 Welcome to having an LS. I used 5-w30 once and if went through 3 quarts in 3k miles lol. Switched to 10w30 and it slowed it down to less than 1
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