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2003 8.1L burb oil consumption and knock

mwitte

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mwitte Enthusiast

mwitte

Posted
Posted

Just bought this about 3 weeks ago and I started noticing a noise underneath the car about 1 week ago. It has a Borla exhaust on it so I just thought it was a exhaust leak. Now after reading around it looks like the dreaded piston slap. Also I checked the oil and its down a quart from when I got it(about 400 miles). Has anyone been able to reduce this with synthetics? I think I got screwed not happy.

tasturbo86 Enthusiast

tasturbo86

Posted
Posted

If you DON'T have piston slap, you got lucky!

 

My '02 had it when I bought it and it has not gotten any worse.

Not much you can do about it because of the way the engine was designed.

Piston slap should quiet down after a minute or so.

 

I also have a noise down low in the engine.

Sort of a loud clicking or clatter that does not go away.

 

Your oil consumption could be caused by a bad intake manifold gasket.

This is a common problem area with the big blocks.

Get a new gasket and also ask about revised intake manifold bolts.

 

terry

 

 

Just bought this about 3 weeks ago and I started noticing a noise underneath the car about 1  week ago. It has a Borla exhaust on it so I just thought it was a exhaust leak. Now after reading around it looks like the dreaded piston slap. Also I checked the oil and its down a quart from when I got it(about 400 miles). Has anyone been able to reduce this with synthetics? I think I got screwed not happy.

 

 

 

billcar9999 Enthusiast

billcar9999

Posted
Posted
Just bought this about 3 weeks ago and I started noticing a noise underneath the car about 1  week ago. It has a Borla exhaust on it so I just thought it was a exhaust leak. Now after reading around it looks like the dreaded piston slap. Also I checked the oil and its down a quart from when I got it(about 400 miles). Has anyone been able to reduce this with synthetics? I think I got screwed not happy.

 

 

 

 

I don't think synthetics help and may even use more oil. I switched back to regular oil and my consumption seems less. I did not replace the intake gaskets. I just tighten the bolts about every six months. Some say that the gasket replacement and new bolts don't help. You could try a dose or two of Mystery oil and a short oil change interval to see if the noise clears up.

tasturbo86 Enthusiast

tasturbo86

Posted
Posted

pasted a GM Technical Service Bulletin below. Worth a try.

 

High Oil Consumption (Replace Intake Manifold Bolts) #02-06-01-035 - (10/17/2002)

High Oil Consumption (Replace Intake Manifold Bolts)

2002 Chevrolet Avalanche

2001-2002 Chevrolet Silverado, Express, Suburban

2001-2002 GMC Sierra, Savana, Yukon XL

2001-2002 Chevrolet and GMC C6-7 Conventional Cab Medium Duty and B7 School Bus Models

with 8.1L Engine (VINs G, E -- RPO L18)

Condition

Some customers may comment about higher than expected oil consumption. Because this type of engine is used under various load conditions, the dealer should verify that the vehicle is using more than 0.946L (1 quart) of oil for every 379L (100 gallons) of fuel used.

Cause

Oil vapor pulled into combustion chamber through the intake manifold may cause this condition.

Correction

Replace all the intake manifold bolts. Replace one bolt at a time in sequence to keep the intake manifold from shifting.

 

Notice

Ensure the intake manifold does not shift as the intake manifold bolts are tightened in the proper sequence. Failure to follow the entire intake manifold bolt tightening sequence exactly may result in an oil leak and serious engine damage.

 

In the order shown below, remove each bolt and replace with a new bolt. Insert the new bolt and tighten to 5 N·m (44 lb in). Then move to the next bolt in sequence until all bolts have been replaced.

 

After all of the bolts have been replaced, tighten each bolt in sequence to 8 N·m (71 lb in).

Tighten all bolts in sequence to a final torque of 12 N·m (106 lb in).

Parts Information

Part Number

Description

Qty

 

12561518

Bolt, Intake Manifold

10

Parts are currently available from GMSPO.

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation

Description

Models

Labor Time

 

J0290

Bolts, Intake Manifold - Tighten or Replace

C/K, C6-7, B7

0.7 hr

 

G Van

1.5 hrs

  • 5 weeks later...
496 XL Enthusiast

496 XL

Posted
Posted
pasted a GM Technical Service Bulletin below.  Worth a try.

 

High Oil Consumption (Replace Intake Manifold Bolts) #02-06-01-035 - (10/17/2002)

High Oil Consumption (Replace Intake Manifold Bolts)

2002 Chevrolet Avalanche

2001-2002 Chevrolet Silverado, Express, Suburban

2001-2002 GMC Sierra, Savana, Yukon XL

2001-2002 Chevrolet and GMC C6-7 Conventional Cab Medium Duty and B7 School Bus Models

with 8.1L Engine (VINs G, E -- RPO L18)

Condition

Some customers may comment about higher than expected oil consumption. Because this type of engine is used under various load conditions, the dealer should verify that the vehicle is using more than 0.946L (1 quart) of oil for every 379L (100 gallons) of fuel used.

Cause

Oil vapor pulled into combustion chamber through the intake manifold may cause this condition.

Correction

Replace all the intake manifold bolts. Replace one bolt at a time in sequence to keep the intake manifold from shifting.

 

Notice

Ensure the intake manifold does not shift as the intake manifold bolts are tightened in the proper sequence. Failure to follow the entire intake manifold bolt tightening sequence exactly may result in an oil leak and serious engine damage.

 

In the order shown below, remove each bolt and replace with a new bolt. Insert the new bolt and tighten to 5 N·m (44 lb in). Then move to the next bolt in sequence until all bolts have been replaced.

 

After all of the bolts have been replaced, tighten each bolt in sequence to 8 N·m (71 lb in).

Tighten all bolts in sequence to a final torque of 12 N·m (106 lb in).

Parts Information

Part Number

Description

Qty

 

12561518

Bolt, Intake Manifold

10

Parts are currently available from GMSPO.

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation

Description

Models

Labor Time

 

J0290

Bolts, Intake Manifold - Tighten or Replace

C/K, C6-7, B7

0.7 hr

 

G Van

1.5 hrs

 

 

 

496 XL Enthusiast

496 XL

Posted
Posted
pasted a GM Technical Service Bulletin below.  Worth a try.

 

High Oil Consumption (Replace Intake Manifold Bolts) #02-06-01-035 - (10/17/2002)

High Oil Consumption (Replace Intake Manifold Bolts)

2002 Chevrolet Avalanche

2001-2002 Chevrolet Silverado, Express, Suburban

2001-2002 GMC Sierra, Savana, Yukon XL

2001-2002 Chevrolet and GMC C6-7 Conventional Cab Medium Duty and B7 School Bus Models

with 8.1L Engine (VINs G, E -- RPO L18)

Condition

Some customers may comment about higher than expected oil consumption. Because this type of engine is used under various load conditions, the dealer should verify that the vehicle is using more than 0.946L (1 quart) of oil for every 379L (100 gallons) of fuel used.

Cause

Oil vapor pulled into combustion chamber through the intake manifold may cause this condition.

Correction

Replace all the intake manifold bolts. Replace one bolt at a time in sequence to keep the intake manifold from shifting.

 

Notice

Ensure the intake manifold does not shift as the intake manifold bolts are tightened in the proper sequence. Failure to follow the entire intake manifold bolt tightening sequence exactly may result in an oil leak and serious engine damage.

 

In the order shown below, remove each bolt and replace with a new bolt. Insert the new bolt and tighten to 5 N·m (44 lb in). Then move to the next bolt in sequence until all bolts have been replaced.

 

After all of the bolts have been replaced, tighten each bolt in sequence to 8 N·m (71 lb in).

Tighten all bolts in sequence to a final torque of 12 N·m (106 lb in).

Parts Information

Part Number

Description

Qty

 

12561518

Bolt, Intake Manifold

10

Parts are currently available from GMSPO.

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation

Description

Models

Labor Time

 

J0290

Bolts, Intake Manifold - Tighten or Replace

C/K, C6-7, B7

0.7 hr

 

G Van

1.5 hrs

 

 

 

 

 

 

 

 

 

 

 

Hi,

 

Check out previous 8.1 oil consumptions regarding re-doing the pcv valve (stan-pipe)the 8.1 has no external pcv valve. removing the intake and tack welding a upwards stan-pipe will eliminate this problem.....do a search to learn more. I have a new 8.1 and will be in those tracks if applicable.Hope this helps.

 

Perry

496 XL Enthusiast

496 XL

Posted
Posted
pasted a GM Technical Service Bulletin below.  Worth a try.

 

High Oil Consumption (Replace Intake Manifold Bolts) #02-06-01-035 - (10/17/2002)

High Oil Consumption (Replace Intake Manifold Bolts)

2002 Chevrolet Avalanche

2001-2002 Chevrolet Silverado, Express, Suburban

2001-2002 GMC Sierra, Savana, Yukon XL

2001-2002 Chevrolet and GMC C6-7 Conventional Cab Medium Duty and B7 School Bus Models

with 8.1L Engine (VINs G, E -- RPO L18)

Condition

Some customers may comment about higher than expected oil consumption. Because this type of engine is used under various load conditions, the dealer should verify that the vehicle is using more than 0.946L (1 quart) of oil for every 379L (100 gallons) of fuel used.

Cause

Oil vapor pulled into combustion chamber through the intake manifold may cause this condition.

Correction

Replace all the intake manifold bolts. Replace one bolt at a time in sequence to keep the intake manifold from shifting.

 

Notice

Ensure the intake manifold does not shift as the intake manifold bolts are tightened in the proper sequence. Failure to follow the entire intake manifold bolt tightening sequence exactly may result in an oil leak and serious engine damage.

 

In the order shown below, remove each bolt and replace with a new bolt. Insert the new bolt and tighten to 5 N·m (44 lb in). Then move to the next bolt in sequence until all bolts have been replaced.

 

After all of the bolts have been replaced, tighten each bolt in sequence to 8 N·m (71 lb in).

Tighten all bolts in sequence to a final torque of 12 N·m (106 lb in).

Parts Information

Part Number

Description

Qty

 

12561518

Bolt, Intake Manifold

10

Parts are currently available from GMSPO.

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation

Description

Models

Labor Time

 

J0290

Bolts, Intake Manifold - Tighten or Replace

C/K, C6-7, B7

0.7 hr

 

G Van

1.5 hrs

 

 

 

 

 

 

 

 

 

 

 

Hi,

 

Check out previous 8.1 oil consumptions regarding re-doing the pcv valve system. (stan-pipe)the 8.1 has no external pcv valve. removing the intake and tack welding a upwards stan-pipe will eliminate this problem.....do a search to learn more. I have a new 8.1 and will be in those tracks if applicable.Hope this helps.

 

Perry

 

 

 

 

 

 

p.s....replacing the intake bolts is like retorquing an existing problem,why not just fill it with fix-a-flat! Do the search like we did and see what the prob is, it's a breather problem below the intake .Again do a Search..If no help let us know..ok?

  • 1 month later...
mwitte Enthusiast

mwitte

Posted
  • Author
Posted

Hey I have been running Mobil 1 10 30 and have run injector cleaner a bunch of times(Techron). My oil consumption is only 1/2 qt in almost 3k miles and the noise has gotten less. Just wanted to share, but the oil consumption is definetly better.

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