LS 5.3 DOD AFM oil consumption

pajamasam

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I'm have been having some oil consumption problems with my girlfriends saab 9-7x which is basically a tbss with a 5.3 instead of 6.0. It does have that displacement on demand or active fuel management which I think is the culprit. It's burning at least 2 qts per oil change.

I have been doing some reading and a ton of trailblazer, saab, and other 5.3 guys are having the same issue.

Some say replace drivers side valve cover with Pcv. Some say it's the AFM valve in the oil pan spraying on the pistons and rings. Some say tune out the AFM completely.

I am very good with LS motors and I don't mind ripping the heads off to put ls7 lifters in if I have too but I want to see what other people are doing first.

Thoughts?
 

daturbosix

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never experienced that amount of oil consumption. try tuning the stuff out to see if that changes stuff. delete the PCV and put a catch can on it or a breather.
is it possible that thing has that much blowby?
 

EmersonHart13

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1quick

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Mine is the same I have done nothing about it for the last 2 years, if there is an easy fix I'm all for it otherwise I plan to re power it with something cool in the future
 

daturbosix

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this must be a DOD and/or AFM issure, because the womans tbss doesnt have any consumption issues.
 

pajamasam

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Yea I'm almost positive it is. Because I have had two suburbans with 300k and 130k never burned a drop of oil.

The saab is an 2007.

I will check the blow by but I highly doubt it.

Also with the oil it burns I would think it would be fouling plugs left and right.


I was thinking about the catch can also just for something to try.
 

EmersonHart13

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My catch can always had oil in it, and it wasn't even a very good one.
 

Ti28

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07' since your out of warranty. Just do a DOD delete and hope the rings ain't shot.
 

pajamasam

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Yea I think I'll do the engine top end cleaning procedure I am reading about. It sounds like I need to get the AFM valve deflector, people have had success with it.
 

pajamasam

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Yea I have been reading a bunch. No one ever has any soild, " I did this with these results" lol

Thanks everyone for your help and thoughts
 

1quick

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I bought a can of the spray sea foam and soaked the pistons through the spark plug hole let it sit over night and that helped slightly but it still burns oil, I think if you did that a few times a year it may clear it up pretty good but I don't care enough about the issue to do that lol it's easier to just add a couple quarts
 

1quick

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I talked to a friend that works at a gm dealer he said there procedure was to spray gm top end cleaner into the cylinders and soak like that, he said the rings get coked up with oil and stick together causing bad blow by I can't confirm wether that's true or not but the piston soak seemed to help some like I said
 

lastls1

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Not to bear bad news or burst a bubble but I believe on these engines GM has a very high tolerance for oil consumption. I believe there is a tsb bulletin that was close to 1.5-2 quarts per 3k or something like that. If I have some Time I will look it up when I get back to my desk. Honestly on an LS style engine if I hear of oil consumption I already know it's normal lol
 

lastls1

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I hope it doesn't get worse... But basically I'm trying to say if it was still under warranty you would have a hard time getting gm to replace anything
 

lastls1

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I know it's not under warranty. I was saying im pretty sure this condition is labeled as normal. No Saab has a warranty anymore. GM washed their hands of Saab when they sold them
 

RICH17

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I wonder if [MENTION=109]TommyGloves[/MENTION] has had this problem?
 

pajamasam

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I talked to a buddy that works at GM today and says he does the ring(top end) cleaning with the GM chemical and the relief valve deflector.

I'm not looking forward to pulling the pan.......
 

Stink Star Productions

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I talked to a friend that works at a gm dealer he said there procedure was to spray gm top end cleaner into the cylinders and soak like that, he said the rings get coked up with oil and stick together causing bad blow by I can't confirm wether that's true or not but the piston soak seemed to help some like I said
This is what we used to do to free stuck rings, now we just replace the pistons.

Not to bear bad news or burst a bubble but I believe on these engines GM has a very high tolerance for oil consumption. I believe there is a tsb bulletin that was close to 1.5-2 quarts per 3k or something like that. If I have some Time I will look it up when I get back to my desk. Honestly on an LS style engine if I hear of oil consumption I already know it's normal lol
The "acceptable" consumption is 1/2qt per 1000 miles. Too high in my opinion but that's what will get you warranty work at a dealer.

Personally we haven't seen too many trailblazers but I've done about a million valve cover/ AFM deflectors and collapsed AFM lifters in c/k trucks. Usually cylinder 7 spark plug gets fouled out with oil and the thing misfires. It's tough to say what your issue is. I've fixed motors with the valve cover and deflector, and I've had to do pistons in some. Problem is, taking off the oil pan on a Saab 97x is pure hell. I'd just deal with it for now and get rid of the car ASAP..... It's that terrible to fix it
 

lastls1

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This is what we used to do to free stuck rings, now we just replace the pistons.







The "acceptable" consumption is 1/2qt per 1000 miles. Too high in my opinion but that's what will get you warranty work at a dealer.



Personally we haven't seen too many trailblazers but I've done about a million valve cover/ AFM deflectors and collapsed AFM lifters in c/k trucks. Usually cylinder 7 spark plug gets fouled out with oil and the thing misfires. It's tough to say what your issue is. I've fixed motors with the valve cover and deflector, and I've had to do pistons in some. Problem is, taking off the oil pan on a Saab 97x is pure hell. I'd just deal with it for now and get rid of the car ASAP..... It's that terrible to fix it

I couldn't remember what it was but I remember it was one of the highest consumption I'd seen as acceptable. U beat me to it.

I second what you say. If at all possible I would sell the vehicle if your able to
 

pajamasam

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She loves the truck there's no way I can sell it lol. I'll just have to plan a weekend to drop the pan. Luckily I have a shop and lift with all the tools I can use to do it.
 

bikrboy128

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Personally we haven't seen too many trailblazers but I've done about a million valve cover/ AFM deflectors and collapsed AFM lifters in c/k trucks. Usually cylinder 7 spark plug gets fouled out with oil and the thing misfires. It's tough to say what your issue is. I've fixed motors with the valve cover and deflector, and I've had to do pistons in some. Problem is, taking off the oil pan on a Saab 97x is pure hell. I'd just deal with it for now and get rid of the car ASAP..... It's that terrible to fix it

i thought i read in a tsb about an updated deflector, but i wasnt sure if it actually worked.

it's probably pistons, so i would just deal with adding a bit of oil every so often :gives:
 

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