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Username Post: 2007 GMC 5.3 AFM motor using oil        (Topic#273652)
MorrissIII 
Forum Newbie
Posts: 4

Reg: 12-17-11
12-17-11 08:54 AM - Post#2169672    

Looking for some help here from someone who knows a little more then me. OK, I have same motor everyone is having problems w/. Going through all same BS. Just had whatever it is there putting in there to redirect the oil, can someone explain to me exactly what there doing there (don't really like the sound of that idea). Also they did a carbon flush not real familiar w/ either, could someone explain to me exactly how this procedure works so I can understand what and how there doing this before I make assumptions. I know enough about combustion and stuff to put my foot in my mouth w/out understanding exactly what there doing.

My concern is w/ detenation and predetenation when they start talking about carbon build up and how it was explained to me a carbon flush is done. Any type of particles floating around in my cylinders (from flush or whatever) is going to cause predetenation right. To go from there if what they have done so far doesn't fix the problem w/ oil consumption, it was explained to me next step is to replace piston and rings. Ok so is predetenation not a cause of pistons and rings burning up. This is just my line of thinking would like some input before I react to there solution. If my line of thinking is right the piston and rings are going to just burn up again if there having a problem w/ improper detenation. That and I'm down to AVG. MPG of 13.1 horrible which has a lot to do w/ efficent combustion (detenation, predetenation).

Any input grately appreciated don't want to stick my foot in my mouth.

Also to eliminate the quality oil BS someone was talking about (probaly GM higher up making excuses). My oil gets changed every 5,000 miles w/ Mobil 1 full synthetic. Would say that is a quality oil.

Edited by MorrissIII on 12-17-11 08:59 AM. Reason for edit: No reason given.

 
Low priced Genuine GM Auto Parts
motorman 
Dedicated Enthusiast
Posts: 5175

Loc: south western pa.
Reg: 01-25-00
12-17-11 12:47 PM - Post#2169756    
    In response to MorrissIII

  • MorrissIII Said:
Looking for some help here from someone who knows a little more then me. OK, I have same motor everyone is having problems w/. Going through all same BS. Just had whatever it is there putting in there to redirect the oil, can someone explain to me exactly what there doing there (don't really like the sound of that idea). Also they did a carbon flush not real familiar w/ either, could someone explain to me exactly how this procedure works so I can understand what and how there doing this before I make assumptions. I know enough about combustion and stuff to put my foot in my mouth w/out understanding exactly what there doing.

My concern is w/ detenation and predetenation when they start talking about carbon build up and how it was explained to me a carbon flush is done. Any type of particles floating around in my cylinders (from flush or whatever) is going to cause predetenation right. To go from there if what they have done so far doesn't fix the problem w/ oil consumption, it was explained to me next step is to replace piston and rings. Ok so is predetenation not a cause of pistons and rings burning up. This is just my line of thinking would like some input before I react to there solution. If my line of thinking is right the piston and rings are going to just burn up again if there having a problem w/ improper detenation. That and I'm down to AVG. MPG of 13.1 horrible which has a lot to do w/ efficent combustion (detenation, predetenation).

Any input grately appreciated don't want to stick my foot in my mouth.

Also to eliminate the quality oil BS someone was talking about (probaly GM higher up making excuses). My oil gets changed every 5,000 miles w/ Mobil 1 full synthetic. Would say that is a quality oil.


retired race engine builder,former NASCAR tech inspector. new corvettes owned 1959,1962,1963,1964,1965, 1966,1997,1999,2002,2005, 2008 plus 30+ other chevy cars and trucks along the way. 2008 corvette sold and waiting on a C-7.


 
motorman 
Dedicated Enthusiast
Posts: 5175

Loc: south western pa.
Reg: 01-25-00
12-17-11 01:15 PM - Post#2169765    
    In response to MorrissIII



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.
retired race engine builder,former NASCAR tech inspector. new corvettes owned 1959,1962,1963,1964,1965, 1966,1997,1999,2002,2005, 2008 plus 30+ other chevy cars and trucks along the way. 2008 corvette sold and waiting on a C-7.


 
motorman 
Dedicated Enthusiast
Posts: 5175

Loc: south western pa.
Reg: 01-25-00
12-17-11 01:21 PM - Post#2169766    
    In response to motorman

  • motorman Said:


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.



cast iron or aluminum block
retired race engine builder,former NASCAR tech inspector. new corvettes owned 1959,1962,1963,1964,1965, 1966,1997,1999,2002,2005, 2008 plus 30+ other chevy cars and trucks along the way. 2008 corvette sold and waiting on a C-7.


 
motorman 
Dedicated Enthusiast
Posts: 5175

Loc: south western pa.
Reg: 01-25-00
12-17-11 01:39 PM - Post#2169771    
    In response to motorman

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
retired race engine builder,former NASCAR tech inspector. new corvettes owned 1959,1962,1963,1964,1965, 1966,1997,1999,2002,2005, 2008 plus 30+ other chevy cars and trucks along the way. 2008 corvette sold and waiting on a C-7.


 
Tom6mn 
Contributor
Posts: 156

Reg: 06-06-11
12-18-11 09:08 PM - Post#2170175    
    In response to motorman

Unfortunately you will need new pistons and rings at least. I have had everything done to my truck. 2007 Chevy 5.3 AFM. Pistons and rings have worked so far....only about 15000 miles with new pistons and rings. Also I have had the entire throttle body replaced as they have also had issues with them as well. Good Luck! I would call GM Executive Offices and open a claim. Don't bother with the customer service lines.

 
Cpt. Scuttle 
Forum Newbie
Posts: 1

Reg: 12-30-11
12-30-11 08:16 AM - Post#2173846    
    In response to Tom6mn

Hello, so it sounds as though for now that the piston replacement as you say "so far" has corrected your problem. I am experiencing the same oil consumption problem as well. One quart every 1600 miles. So far they have added the deflector and replaced the left valve cover. None of this of course worked. Now they are going to replace all pistons and rings. I requested new motor of course that did not fly. They advised they have to do the piston replacement 1st. Sorry to say I am a little skeptical since they assured me the cover and the oil deflector would fix the issue. Anyway, my question to you is this, did you open a claim with the exec offices even though they were taking care of replacing the pistons?? If so can you advise what number you contacted? I would like to file a claim as well, not sure what good it is going to do but at least it is on record.

This is an obvious engineering flaw that GM has yet to own up to.

On another note I have a friend that "had" and 07 Suburban with the 5.3 AFM, he had the same problem however I did not learn of this prior to purchasing my 07 truck. He ended up trading it in and not dealing with the problem.

Prior to owning this 07 I had a 1999 Silverado 5.3, ran great never used a drop of oil. Loved the truck!!

I hope GM makes this right, if not it will be my last.

 
Tom6mn 
Contributor
Posts: 156

Reg: 06-06-11
01-03-12 11:45 AM - Post#2175291    
    In response to Cpt. Scuttle

GM will not make it right so I wouldnt get my hopes up! Since the pistons and ring replacement try have since replaced all my motor mounts due to noise from the engine, replaced the entire throttle body system and the truck now has developed a "stutter" when ideling, sitting at stop lights and in traffic, and when accelerating. My truck has been at the dealer for two weeks with no resolution! Good luck! Taking apart the motor over and over will have a bad outcome on the motor in the long run. As I am experiencing now. The number is 1-313-667-7153. This is the last time me or my family will buy a GM product. They only want your money and will not stand by there products. Typical Government Motors!

 
colovette 
Member
Posts: 24

Loc: Denver, CO
Reg: 05-17-02
02-01-12 04:16 PM - Post#2186046    
    In response to Tom6mn

I've got just under 36K miles on my 5.3L Silverado and have occasional lifter noice on cold start, but no (at least for now) oil consumption. Am I to expect the oil consumption to follow or is this a "maybe it will, maybe it won't happen" situation.

 
Tom6mn 
Contributor
Posts: 156

Reg: 06-06-11
02-01-12 06:25 PM - Post#2186110    
    In response to colovette

It's a maybe it will thing. Lifter noise is normal unless it is getting louder. I would carefully monitor your oil level and make sure it doesn't drop. You will know if it starts to burn as it will slowly burn more until about 3 quarts every 3000-5000 miles. If it does start burning.....take it to a dealer ASAP and make sure you get an invoice for your concerns as this will be proof of when the consumption started. The Lemon Law regards this as the amount of mileage a dealer is entitled to and the repurchase price will be adjusted from this point. Don't wait or let them tell you it's normal.

 
colovette 
Member
Posts: 24

Loc: Denver, CO
Reg: 05-17-02
02-01-12 10:33 PM - Post#2186186    
    In response to Tom6mn

I'll keep a close watch. Any data on what percentage of AFM engines have the oil consumption problem?

 
boogie 
Senior Member
Posts: 2141
boogie
Loc: Louisiana
Reg: 07-11-02
02-05-12 03:31 AM - Post#2187314    
    In response to colovette

2008 Silverado 5.3 AFM here.

Although I personally dont care for AFM nor do I think its benificial, My truck never has used a drop of oil and it currently has 48,000 and some change miles on it.
'85 GMC C1500 SWB 355 sbc


 
elcamino 
Valued Contributor
Posts: 4987
elcamino
Loc: Lake Superior-Michigan US...
Reg: 03-30-00
02-05-12 04:36 AM - Post#2187317    
    In response to boogie

This is not unique to GM, go buy one of these

  • Quote:
Anyone else have a newer under warranty say 2010 or 2011 5.7L tundra burn any oil? At last 25K oil change, I noticed down 1 qt. of oil in 5,000 miles. I just checked it again at 27K and down 1/2 qt. already, so guessing at least 1 qt. of oil burning if not a tad more every 5,000 mile oil change. Corporate toyota/dealer claims adding 1 qt. of oil every 1200 miles is within specs and normal operation. What the F!!!!!!!!
Never had one new vehicle in over 20 bought in over 25 years burn one drop of oil. I do not beat on the truck or tow heavy loads, mostly normal hwy. driving. I say B.S., what can I do besides trade in the darn thing or just live with adding 1 qt. of oil every oil change? Anyone else have oil consumption to this effect or more and what did dealer say?
I sort of hope they find an oil leak, but doubt it since no oil drops on garage or driveway concrete at least that is fixable.



Mike
2009 Cadillac CTS4 AWD Performance Sedan
2012 GMC Sierra AWD Denali 6.2L


 
Brandonwinter 
Forum Newbie
Posts: 2

Reg: 02-25-12
02-25-12 06:36 PM - Post#2195201    
    In response to Tom6mn

I'm having all the same issues. 07 5.3 AFM 48k miles. Been to the dealer over 10x between oil consum tests, Oil deflector, left valve cover, ect. No rebuild as of yet.
I'm in the market for a new SUV for my wife. We were looking at Gm but after these problems I have started looking at the new Explorer. Not because of the problem. The Suv wouldnt have the same engine but more on the lines of GM and thier handling of this issue.


 
Brandonwinter 
Forum Newbie
Posts: 2

Reg: 02-25-12
02-25-12 06:41 PM - Post#2195203    
    In response to Brandonwinter

Has anyone went the Lemon Law route? Wondering if this meets the standards and if so, will GM be required to install a new engine or somekind of vehicle buy back?

 
Tom6mn 
Contributor
Posts: 156

Reg: 06-06-11
02-26-12 03:17 PM - Post#2195525    
    In response to Brandonwinter

What state are you in?

 
chevy07suksoil 
Forum Newbie
Posts: 3

Reg: 05-08-12
05-08-12 07:45 PM - Post#2223990    
    In response to Brandonwinter

Im curious as well, we are wanting to go legal route, tired of all this bs.

 
Tom6mn 
Contributor
Posts: 156

Reg: 06-06-11
05-09-12 11:25 AM - Post#2224164    
    In response to chevy07suksoil

It will be a repurchase.....they will not replace the engine as there is no guarantee that the new one won't develop the same problems again. Very easy to do. Most lemon law attorneys will give you free consultation and will only take your case if you have a great chance of winning. No money out of pocket and this oil consumption issue DOES qualify as a lemon depending on how long/how many times your truck was in the shop.

 
kilapapipa 
Forum Newbie
Posts: 46

Reg: 02-11-08
05-21-12 12:32 PM - Post#2228246    
    In response to Tom6mn

Try some Kreen by Kroil. You have to order it online. $40 for 2 qts. Put one in the oil and one in the fuel tank with less than a qtr. tank. Worked well for me to clear out some carbon. This summer I am going to get more and put it in the spark plug holes as well as more in the oil. Decreased my oil usage and upped mileage from 15 back to 16-17 on my 08' Sub.

And don't give me any snake oil BS. Try it or don't try it, I don't care.

 
crew08 
Forum Newbie
Posts: 8

Reg: 11-16-11
07-19-12 01:07 PM - Post#2249939    
    In response to kilapapipa

Had the same issue on my 2008 5.3 Silverado. it will take new pistons and rings to fix the problem. Hopefully it will not resurface. Not all 5.3 AFM engines have the issue. I have a friend with the same truck and engine. He has 85000 miles on his and it doesn't use any oil. It deals with the AFM system and how the pistons/rings fit to the block of your particular engine...my opinion.

 
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