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12-06-2012, 09:07 AM #21
#10-06-01-008F: Engine Oil Consumption on Aluminum Block/Iron Block Engines with Active Fuel Management (AFM) (Install AFM Oil Deflector and Clean Carbon from Cylinder and/or Install Updated Valve Cover) - (Oct 1, 2012)
Subject: Engine Oil Consumption on Aluminum Block/Iron Block Engines with Active Fuel Management (AFM) (Install AFM Oil Deflector and Clean Carbon from Cylinder and/or Install Updated Valve Cover)
Models: 2007-2011 Cadillac Escalade Models
2007-2011 Chevrolet Avalanche, Silverado 1500, Suburban, Tahoe
2010-2011 Chevrolet Camaro
2007-2011 GMC Sierra 1500, Sierra Denali, Yukon Models
2008-2009 Pontiac G8 GT
Built Prior to February 1, 2011 (Updated Valve Cover) and October 2010 (AFM Shield)
Equipped with Any of the Following Engines:
– Aluminum Block V8 Engine with Active Fuel Management (AFM) (RPOs L94, LZ1, L99, LC9, LH6, L76, LFA, L92)
– Iron Block V8 Engine with Active Fuel Management (AFM) (RPOs LMG, LY5)
– Hybrid Engine (RPO LFA – Only Applies to Hybrid Models Built July 7, 2009 - February 1, 2011 – Prior Builds Not Cast For AFM Valve)
Attention: This bulletin does not apply to the Buick Rainier, Chevrolet TrailBlazer and GMC Envoy equipped with LH6 due to a different design oil pan and AFM pressure relief valve.
This bulletin is being revised to update the Condition and modify the oil consumption test procedure. Please discard Corporate Bulletin Number 10-06-01-008E (Section 06 – Engine/Propulsion System).
Some customers may comment about engine oil consumption of vehicles with higher mileage (approximately 48,000 to 64,000 km (30,000 to 40,000 mi) and a service engine soon light being on and/or rough running engine. Verify that the PCV system is functioning properly. If the customer understands that some oil consumption is normal and still feels the consumption level is excessive, more than 1 quart per 2000 to 3000 miles of driving, perform the service indicated in this bulletin. It is no longer necessary to have the customer return multiple times to have the usage verified.
This condition may be caused by two conditions. Oil pulled through the PCV system or oil spray that is discharged from the AFM pressure relief valve within the crankcase. Under most driving conditions and drive cycles, the discharged oil does not cause a problem. Under certain drive cycles (extended high engine speed operation), in combination with parts at the high end of their tolerance specification, the oil spray quantity may be more than usual, resulting in excessive deposit formation in the piston ring grooves, causing increased oil consumption and cracked or fouled spark plugs (#1 and/or #7). Refer to the latest version of Corporate Bulletin Number 12-06-01-001.
Aluminum or Cast Iron Block - Oil in Intake Manifold - Install Updated Valve Cover on All Models Built Prior to February 1, 2011
Note: If vehicle is built after this breakpoint, it should already be equipped with this updated valve cover.
1) Old Design
2) New Design
PCV pullover or an overactive lifter can cause oil to be pulled through the PCV system even at low vehicle mileage. A correctly functioning PCV system will only leave a film of oil in the intake manifold. Inspect the intake manifold to see if there is any oil puddling in the bottom. If there is you will need to replace the left valve cover. Two new left rocker arm covers have been released for trucks and vans. Technicians should replace the left rocker arm cover with GM P/N 12570427 for 2007-2008 or GM P/N 12642655 for 2009-2011. Refer to the Parts Information below for the Camaro. This rocker arm cover has a relocated PCV drain hole that prevents oil from entering the intake manifold. Refer to Valve Rocker Arm Cover Replacement - Left Side in SI.
Note: These rocker covers are for specific years. The PCV orifice is different for each. The correct cover must be used or an SES light may set.Aluminum Block - Oil Getting Past Piston Rings - Free Up Piston Rings and Install AFM Shield on All Non-Hybrid Models Built Prior to October 1, 2010 or all Hybrid Models Built July 7, 2009 - October 1, 2010
Note: If vehicle is built outside of this breakpoint, it should already be equipped with this AFM shield or the pan does not have an AFM valve (LFA before July 7, 2009).To correct this condition, install an AFM shield, perform the piston cleaning procedure as described in this document and install a new oil pan gasket per the procedure outlined in this document. Monitor oil consumption after this repair to ensure oil consumption has improved to acceptable levels.
If this repair does not correct the condition, it may be necessary to replace all of the piston assemblies (piston and rings) with new parts. Refer to SI for repair procedure.
Important: It is critical in this cleaning process that the engine/fuel injector cleaner remain in the cylinders for a minimum of 2.5 hours to fully clean the components. The cleaner solution must be removed before a maximum of three hours.
1. Remove the spark plugs and ensure that none of the pistons are at top dead center (TDC).
2. Clean the pistons by putting 118-147 ml (4-5 oz) of Upper Engine and Fuel Injector Cleaner, GM P/N 88861803 (in Canada, use 88861804), in each cylinder. Allow the material to soak for at least 2.5-3.0 hours, but no more than three hours and then remove the cleaner. A suggested method of removing the cleaner is cranking the engine over. Make sure to unplug the ignition coils and fuel injector before cranking the engine over. Also make sure that the painted surfaces are covered so no damage is done.
3. Remove the oil pan. Refer to Oil Pan Replacement in SI.
4. Remove the AFM valve (1).
5. Install the new shield (1), GM P/N 12639759, and tighten the AFM valve to the oil pan to 28 N·m (20 lb ft).
Important: Ensure that the engine cleaner is thoroughly removed before reinstalling the spark plugs. Failure to do so may result in a hydro-lock condition.
6. Reinstall the spark plugs. Replace the spark plugs if necessary due to full of carbon. Refer to the parts catalog.
7. Reinstall the oil pan. Refer to the Oil Pan Installation procedure in SI. Replace the oil pan gasket if necessary. Refer to the parts catalog. Replace the engine oil.
8. Re-evaluate the oil consumption. Document on the repair order. If the oil consumption is still greater than 0.946 L (1 qt) in 3,200 km (2000 mi), replacement of the pistons and rings will be required."i dont think you got the picture. i got a beautiful picture. this baby happens to have an extra turn of speed, which is the only thing i care about. you dont understnad what happens do you? they make cars. they make 'em exactly the same way. one or two of 'em turn out to be something special. nobody knows why. i know why. i may be kiddin' myself, but i think i can make somethin' out of that sad little bucket of bolts." ~ Tennessee Steinmetz
12-06-2012, 10:12 AM #22
minimum of 2.5 hours to fully clean the components
i would almost bet my life savings that when they did this procedure on my truck they didnt wait 2.5 hours. probably why im still fouling plugs.
i have not seen this update the last one i saw was #10-06-01-008D
12-07-2012, 07:04 AM #23
- Join Date
- May 2012
- Corpus Christi
If finances are not a problem,I'd trade that pig in for a 6.2L L9H non AFM and fuggetaboutit. That's what I did after 2000 miles on a 11' I originally bought after researching many owners with oil consumption and fouled cylinder headaches and getting tired of driving around in M5 mode to keep the AFM from activating.Didn't want to jeopardize my warranty by disabling it with a tuner on such a new unit.2012 silver ice metallic Silverado CC 4X4 /6.2L / 373/9.5" rear max trailering package/ 18" Z71 rims with 285/65/18 BFG TA/KO Ebony leather interior / 2011 grill insert with black mesh/rear fender liners and bed rail protectors/ Z71 skid plates/GM bed mat/2" billet aluminum under strut front leveling kit
12-07-2012, 08:25 AM #24
ya know, after reading all this, it kinda makes me wish i had gone that route o'brien.
2011 GMC Sierra SLE 5.3 Z71 4X4 Stealth Gray Metallic
Tow mirrors - Diablew Tuned - Flowmaster Regular 40 - Ready Lift 2.5' lift - BFG LT A/T K/Os - Carr Light Wing - TruckLite LED lights - Optima Red Top - 50% Front Window Tint - Line-X bedliner - Aidaid MIT - Tekonsha P2 - ARS Billet Grill
12-07-2012, 08:36 AM #25
12-07-2012, 10:21 AM #26
- Join Date
- May 2012
- Corpus Christi
I totally understand your dilema. It's hard getting rid of such a nice truck that you likely hand picked because of some oil consumption glitch.Conversely if the engine reaches a point at which the dealer needs to tear into it and start replacing pistons and rings it's not very confidence inspiring either. I wish you luck either way you go and hope all turns out for the better so you like anyone else can feel confident with such a significant purchase as a reasonably new CC 4 wheel drive truck should be.
12-07-2012, 03:11 PM #27
also have to understand that this is a big process. gm seems to have found a coure for whats going on but it all depends on how bad the engine is. first started with just replaceing the valve cover and cleaning pistins with top end cleaner, if that didnt fix it thne you added the deflector. then it became just do both (if the vehicle is a certain year) and top end cleaner, if that doesnt fix it, pistons need to come out etc. unfortunitly from a buisness stand point gm doesnt want to go and just start poping out pistons for something a valve cover and deflector will fix. too costly. if it gets to the point pistons come out then your probably going to have the problem fix. next step would quite possibly be a new engine.
mind you you need to have a reliable dealer and not a place that just half fast crap.
12-09-2012, 07:56 PM #28
- Join Date
- Jul 2011
- Mississauga, Ontario, Canada
I have had the exact same problem on my 2010 with the 5.3 and 6 speed. Thanks to the poster who posted the service bulletin. I'm going to take it in next I'm at the dealership. I have also had a lot of problems with the throttle dn fuel sensors. The truck will either feel too accelerated or have no power at all. Once, at a stoplight in October, it jumped, turned off the stabiltrak, told me the engine was losing power, and then shut off. The dealer replaced the sensors in October but the truck still does the same stuff and it consumes way more fuel. Previously I was getting 16 litres/100 km. Now, I'm getting 20 litres/100 km. Overall, I've been very disappointed with this truck. I used to have a 1989 GM and then a 2000 GM before this one. I loved both trucks way more than this one. They are going to introduce the new 2014 Sierra on Dec. 13. I might trade this one in on that or maybe even look at the new 2013 Dodge Ram.
12-09-2012, 09:31 PM #29
once mine get out of the body shop im checking the oil before the oil change. the light hasnt come on so I got my fingers crossed itll be fine.
12-15-2012, 05:45 PM #30
Well 400 miles out of the shop and carbon build up on new spark plugs causing a misfire again. Looks like its trade it in and be out of my hair or new rings and pistons this week
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