This chick needs advice!! 2008 Ticking Tahoe...poss LIFTER?
July 24th, 2014, 10:36 PM
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This chick needs advice!! 2008 Ticking Tahoe...poss LIFTER?
I need some advice...I have a 2008 4.8L V8 Tahoe with 114k miles. Approx 1 month ago I noticed a quiet ticking at startup which seemed to lessen as the engine warmed up. I ran it by a local shop and was told the water pump bearings were bad. Next day, engine light comes on with stabilitrack and traction control messages flashing. SO I installed a new water pump (myself). Turns out the bearings were fine. I took it to another shop where the mechanic checked the engine light code which showed misfire on 2nd cylinder. the car started idling funny, fluctuating between 200-600 rpm. i replaced all spark plugs, wires and 2nd engine coil pack. annnd the issue continues...checked cylinder compression pressure. it was 100. manual said it should be 110. but 4th cylinder was 100 too so mechanic said it was fine. checked fuel injectors which are fine. he concluded that it was a valve spring?? took it to a THIRD mechanic who kept it all day and said it is the intake lifter on the 2nd cylinder and that it needs to be brought to a dealer for repair and reprogramming. brought it to the dealer...they said it's likely a lifter and/or camshaft bearings. WTH??!!! this is a $3,500+ repair on a well maintained engine with 114k miles!
So I see where people have this rattling lifter problem and they flush their motors and solve the problem...ANY SUGGESTIONS?!! ANY other ideas of what it could be???
What additional damage can I cause by driving it should a lifter really need replacing?
AND I've done the rest of the work I talked about...is it feasible to get a Haynes Manual and do this myself too? From what i can tell, the majority of the bill is LABOR.
So I see where people have this rattling lifter problem and they flush their motors and solve the problem...ANY SUGGESTIONS?!! ANY other ideas of what it could be???
What additional damage can I cause by driving it should a lifter really need replacing?
AND I've done the rest of the work I talked about...is it feasible to get a Haynes Manual and do this myself too? From what i can tell, the majority of the bill is LABOR.
July 25th, 2014, 11:09 AM
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Unless the lifter is collapse meaning a load clunking no need to replace IMO ! Dirty lifters
Pennzoil has some excellent cleaning agents in their oil !
this is a better informative video !
#10-06-01-008D: Engine Oil Consumption on Aluminum Block/Iron Block Engines with Active Fuel Management (AFM) (Install AFM Oil Deflector and Clean Carbon from Cylinder) - (Jan 17, 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)
Models: 2007-2010 Cadillac Escalade, Escalade ESV, Escalade EXT
2007-2010 Chevrolet Avalanche, Silverado 1500, Suburban, Tahoe
2010 Chevrolet Camaro
2007-2010 GMC Sierra 1500, Sierra Denali, Yukon, Yukon XL, Yukon Denali, Yukon Denali XL
2008-2009 Pontiac G8 GT
Equipped with Aluminum Block V8 Engine with Active Fuel Management (AFM) (RPOs L94, LZ1, L99, LC9, LH6, L76, LFA, L92)
RPO LFA (Hybrid Engine) ONLY – Built After July 7, 2009
or Equipped with Iron Block V8 Engine with Active Fuel Management (AFM) (RPOs LMG, LY5)
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 parts information to include the oil pan gasket. Please discard Corporate Bulletin Number 10-06-01-008C (Section 06 – Engine/Propulsion System).

Condition
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). Verify that the PCV system is functioning properly. If diagnostic procedures indicate that oil consumption is piston/piston ring related, verify that oil consumption is greater than 0.946 L (1 qt) in 3,200 km (2000 mi). If these conditions are met and oil consumption is greater than 0.946 L (1 qt) in 3,200 km (2000 mi), perform the service indicated in this bulletin.
Cause
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.
Correction
Screen shot 2012-08-24 at 8.04.41 AM.png
Screen shot 2012-08-24 at 8.04.41 AM.png (134.63 KiB) Viewed 5454 times


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 2009-2010. 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.
AFM – Oil Getting by Piston Rings – Aluminum Block
To correct this condition, perform the piston cleaning procedure as described in this document and install the 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 Verify the oil consumption concern following Corporate Bulletin Number 01-06-01-011G. If oil consumption is found, continue on with this bulletin.
2 Remove the spark plugs and ensure that none of the pistons are at top dead center (TDC).
3 Clean the pistons by putting 118-147 ml (4-5 oz) of Upper Engine and Fuel Injector Cleaner, GM P/N 88861802 (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.
4 Remove the oil pan. Refer to Oil Pan Replacement in SI.
Screen shot 2012-08-24 at 8.04.53 AM.png
Screen shot 2012-08-24 at 8.04.53 AM.png (165.41 KiB) Viewed 5454 times
 
5 Remove the AFM valve (1).
Screen shot 2012-08-24 at 8.05.05 AM.png
Screen shot 2012-08-24 at 8.05.05 AM.png (138.43 KiB) Viewed 5454 times
 
6 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.
7 Reinstall the spark plugs. Replace the spark plugs if necessary due to full of carbon. Refer to the parts catalog.
8 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.
9 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.
Note: It is not necessary to hone or deglaze the cylinder walls. Honing may induce unnecessary cylinder wall and / or piston ring damage if it is done incorrectly and/or not cleaned thoroughly. Cylinder walls should cleaned thoroughly with brake cleaner before installation of the new pistons and rings. Numerous engines replaced for oil consumption have been inspected. The cross hatch has been consistently good and is in specification. As a result, is should not be necessary to measure the cylinders if they pass the visual inspection.
Cast Iron Block – Oil Getting Past Rings
1 Verify the oil consumption concern following Corporate Bulletin Number 01-06-01-011G. If oil consumption is found, continue on with this bulletin.
2 Remove the spark plugs and ensure that none of the pistons are at top dead center (TDC).
3 Clean the pistons by putting 118-147 ml (4-5 oz) of Upper Engine and Fuel Injector Cleaner, GM P/N 88861802 (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.
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.
4 Reinstall the spark plugs. Replace the spark plugs if necessary due to full of carbon. Refer to the parts catalog.
5 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.
Note: It is not necessary to install the shield when doing the piston cleaning on a cast iron block engine since the cast iron block engine uses a different oil pump than an aluminum block engine, which results in a higher engine speed before the AFM pressure relief valve opens (cast iron block engines are less prone to the AFM oil spray condition described earlier). If you find it necessary to replace the pistons, only then should you add the shield.
Screen shot 2012-08-24 at 8.05.15 AM.png




Important: Some minor scratches may be noticed on the cylinder walls during piston and ring replacement. If the scratch cannot be felt when running your finger nail over it, the scratch is considered normal wear and the block or engine should not be replaced.
Parts Information
Part Number Description Qty
12639759 DEFLECTOR-OIL PRESS RLF VLV (quantity of 3 per order) 1
88861802 (in Canada, use 88861804) CLEANER, F/INJR 16 OZ LIQUID POUR (Upper Engine and Fuel Injector Cleaner) 3
12612350 GASKET, OIL PAN 1
12642655 COVER ASM-VLV RKR ARM (2009-2010 Truck Models Only) 1
12570427 COVER ASM-VLV RKR ARM (2007-2008 Truck Model Only) 1
12642655 COVER ASM-VLV RKR ARM (2010 Camaro) 1
12610768 PCV Tube (2010 Camaro) 1
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation Description Labor Time
J7555* Install AFM Oil Deflector, Rocker Arm Cover- Left Bank and Clean Carbon from Cylinder (Aluminum Block V8) (RPOs L94, LZ1, L99, LC9, LH6, L76, LFA, L92) 4.1 hrs
Clean Carbon from Cylinder and Install Rocker Arm Cover - Left Bank (Cast Iron Block V8) (RPOs LMG, LY5) 2.6 hrs
Install AFM Oil Deflector, Rocker Arm Cover- Left Bank and Clean Carbon from Cylinder (4WD) 5.1 hrs
Install AFM Oil Deflector, Rocker Arm Cover- Left Bank and Clean Carbon from Cylinder (G8 Only) 11.0 hrs
*This is a unique labor operation for bulletin use only. It will not be published in the Labor Time Guide.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.  WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
Unless the lifter is collapse meaning a load clunking no need to replace IMO ! Dirty lifters
Pennzoil has some excellent cleaning agents in their oil !
this is a better informative video !
#10-06-01-008D: Engine Oil Consumption on Aluminum Block/Iron Block Engines with Active Fuel Management (AFM) (Install AFM Oil Deflector and Clean Carbon from Cylinder) - (Jan 17, 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)
Models: 2007-2010 Cadillac Escalade, Escalade ESV, Escalade EXT
2007-2010 Chevrolet Avalanche, Silverado 1500, Suburban, Tahoe
2010 Chevrolet Camaro
2007-2010 GMC Sierra 1500, Sierra Denali, Yukon, Yukon XL, Yukon Denali, Yukon Denali XL
2008-2009 Pontiac G8 GT
Equipped with Aluminum Block V8 Engine with Active Fuel Management (AFM) (RPOs L94, LZ1, L99, LC9, LH6, L76, LFA, L92)
RPO LFA (Hybrid Engine) ONLY – Built After July 7, 2009
or Equipped with Iron Block V8 Engine with Active Fuel Management (AFM) (RPOs LMG, LY5)
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 parts information to include the oil pan gasket. Please discard Corporate Bulletin Number 10-06-01-008C (Section 06 – Engine/Propulsion System).

Condition
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). Verify that the PCV system is functioning properly. If diagnostic procedures indicate that oil consumption is piston/piston ring related, verify that oil consumption is greater than 0.946 L (1 qt) in 3,200 km (2000 mi). If these conditions are met and oil consumption is greater than 0.946 L (1 qt) in 3,200 km (2000 mi), perform the service indicated in this bulletin.
Cause
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.
Correction
Screen shot 2012-08-24 at 8.04.41 AM.png
Screen shot 2012-08-24 at 8.04.41 AM.png (134.63 KiB) Viewed 5454 times


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 2009-2010. 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.
AFM – Oil Getting by Piston Rings – Aluminum Block
To correct this condition, perform the piston cleaning procedure as described in this document and install the 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 Verify the oil consumption concern following Corporate Bulletin Number 01-06-01-011G. If oil consumption is found, continue on with this bulletin.
2 Remove the spark plugs and ensure that none of the pistons are at top dead center (TDC).
3 Clean the pistons by putting 118-147 ml (4-5 oz) of Upper Engine and Fuel Injector Cleaner, GM P/N 88861802 (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.
4 Remove the oil pan. Refer to Oil Pan Replacement in SI.
Screen shot 2012-08-24 at 8.04.53 AM.png
Screen shot 2012-08-24 at 8.04.53 AM.png (165.41 KiB) Viewed 5454 times
 
5 Remove the AFM valve (1).
Screen shot 2012-08-24 at 8.05.05 AM.png
Screen shot 2012-08-24 at 8.05.05 AM.png (138.43 KiB) Viewed 5454 times
 
6 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.
7 Reinstall the spark plugs. Replace the spark plugs if necessary due to full of carbon. Refer to the parts catalog.
8 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.
9 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.
Note: It is not necessary to hone or deglaze the cylinder walls. Honing may induce unnecessary cylinder wall and / or piston ring damage if it is done incorrectly and/or not cleaned thoroughly. Cylinder walls should cleaned thoroughly with brake cleaner before installation of the new pistons and rings. Numerous engines replaced for oil consumption have been inspected. The cross hatch has been consistently good and is in specification. As a result, is should not be necessary to measure the cylinders if they pass the visual inspection.
Cast Iron Block – Oil Getting Past Rings
1 Verify the oil consumption concern following Corporate Bulletin Number 01-06-01-011G. If oil consumption is found, continue on with this bulletin.
2 Remove the spark plugs and ensure that none of the pistons are at top dead center (TDC).
3 Clean the pistons by putting 118-147 ml (4-5 oz) of Upper Engine and Fuel Injector Cleaner, GM P/N 88861802 (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.
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.
4 Reinstall the spark plugs. Replace the spark plugs if necessary due to full of carbon. Refer to the parts catalog.
5 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.
Note: It is not necessary to install the shield when doing the piston cleaning on a cast iron block engine since the cast iron block engine uses a different oil pump than an aluminum block engine, which results in a higher engine speed before the AFM pressure relief valve opens (cast iron block engines are less prone to the AFM oil spray condition described earlier). If you find it necessary to replace the pistons, only then should you add the shield.
Screen shot 2012-08-24 at 8.05.15 AM.png




Important: Some minor scratches may be noticed on the cylinder walls during piston and ring replacement. If the scratch cannot be felt when running your finger nail over it, the scratch is considered normal wear and the block or engine should not be replaced.
Parts Information
Part Number Description Qty
12639759 DEFLECTOR-OIL PRESS RLF VLV (quantity of 3 per order) 1
88861802 (in Canada, use 88861804) CLEANER, F/INJR 16 OZ LIQUID POUR (Upper Engine and Fuel Injector Cleaner) 3
12612350 GASKET, OIL PAN 1
12642655 COVER ASM-VLV RKR ARM (2009-2010 Truck Models Only) 1
12570427 COVER ASM-VLV RKR ARM (2007-2008 Truck Model Only) 1
12642655 COVER ASM-VLV RKR ARM (2010 Camaro) 1
12610768 PCV Tube (2010 Camaro) 1
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation Description Labor Time
J7555* Install AFM Oil Deflector, Rocker Arm Cover- Left Bank and Clean Carbon from Cylinder (Aluminum Block V8) (RPOs L94, LZ1, L99, LC9, LH6, L76, LFA, L92) 4.1 hrs
Clean Carbon from Cylinder and Install Rocker Arm Cover - Left Bank (Cast Iron Block V8) (RPOs LMG, LY5) 2.6 hrs
Install AFM Oil Deflector, Rocker Arm Cover- Left Bank and Clean Carbon from Cylinder (4WD) 5.1 hrs
Install AFM Oil Deflector, Rocker Arm Cover- Left Bank and Clean Carbon from Cylinder (G8 Only) 11.0 hrs
*This is a unique labor operation for bulletin use only. It will not be published in the Labor Time Guide.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.  WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
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