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2008 5.3 vortex fouling plug cyl #6 oil

2008 5.3 vortex fouling plug cyl #6 oil

Postby Stevemaman [OP] » Aug 27 2012, 3:14am

I am new to this forum. In advance ,I thanks all of you for all the information I already collected .it has helped me pinpoint my issues..
So,here we go :

2008 truck , 4x4'built in USA,engine manufactured in 2008 February,truck finished in February and shipped to africa where I ordered the truck through a gm dealer.

It has 50k approx. it has been great till recently.
Took it to the gm dealer after it started misfiring and the code showed up as check engine and stabilitrak.

The put a scanner and clearly showed cyl #6 misfire.
We took all plugs out with the gm tech . All plugs perfect but #6. It was fouled because of oil.

We put new plugs in it...erased the codes..started the engine..ran great for 2 min.. Then again,scanner showed cyl 6 misfire.

Took it out and oil it is !
The tech was quick to say u need a new engine ....after sone arm twisting,we got to ..you need pistons and rings ....then I read all the forum info on oil burning and lugs fouling and called them back last week. I am in Canada and keep the truck there.

So here are my research and questions ... I am getting killed there with techies that never and don't know zip about the common issues of 5.3 of oil and plug fouling , and valve covers with baffles, and flex fuel regulators for spraying oil to the cylinders that go bad, and all the different tbs ... They are lost and ignorant. I am forced to do all the work for them of else I am lost with the truck there. I need to pinpoint as best as I can and take the parts with me next week.

I never did an oil consumption test but it seems not to be an issue at all..no smell, no smoking..and the is fire issue is a first for the truck. Been great so far.

- are my rings shot on cyl 6 ?
-are my rings sticking and need the cleaning for rings gm recommends ? If yes, then why did just that one cylinder stick and all others remain perfect ? Wouldn't make sense..
-valve cover with baffle....PVC valve,... I understand 08 had the new style valve covers ? And even if mine had the old style, wouldn't I find oil on more than one plug that would misfire or at least show sins of oil. ...?
-can it be from the valve or valve guide or seal ?
-can it be frm the flex fuel where apparently,08 motors we made with a different oil spraying system for each cylinder ..and in my case,#6 sprayer is not regulated properly or defaulting therefore shooting too much oil ? In that case, I could just have the cleaner tbs for the rings gm recommended, then fix the regulator issue of the flex fuel ..
Please , consider my motor was build in feb 08, any ideas would be greatly appreciated. I travel next week. Mechanic wants me to bring be piston,one ring set,crank bearings,and all gaskets.... I am not convinced I need new rings , I feel Otis either coming from the fuel flex system or maybe the valve cover. (but then again, why just cyl 6 if the valve cover would be at error,then a few cyl would see oil..not just cyl 6) ...
So am I right to feel all is pointing to the flex fuel system sprayer of cyl 6 !?
How do we check this ? What's the way to see if defective or they say we need to reroute it with a shield.. .???

Thanks in advance .
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Re: 2008 5.3 vortex fouling plug cyl #6 oil

Postby BlackZ71Silverado » Aug 27 2012, 11:36pm

What do you mean the Flex Fuel System???

Does cylinder 6 deactivate when AFM kicks in?

I bet all you need to do is replace the valve cover gasket and spark plug hole seals. Oil can be getting in there is there is a bad seal. That may explain only a problem with one cylinder and will definately cause a misfire.
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Re: 2008 5.3 vortex fouling plug cyl #6 oil

Postby Stevemaman [OP] » Aug 28 2012, 1:39am

It has the flex fuel option..
The oil isn't on the valve cover side but on the combustion chamber side. The plug gets fouled and stops sparking as it carbons up with burnt oil .... The oil is either coming to the spark plug from the rings or PVC valve return from the left valve cover , or the afm system that is spraying oil on the walls when running on 4 cyl in my opinion... My valve cover. Gaskets are not leaking onto the plugs.
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Re: 2008 5.3 vortex fouling plug cyl #6 oil

Postby BlackZ71Silverado » Aug 28 2012, 2:28am

Being capable of "flex fuel" has absolutely nothing to do with anything, other than what kind of fuel you can put in the tank.

Take it to the GM dealership.
2010 Silverado 5.3 w/Z71 appearance pkg.
CAI tube
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Re: 2008 5.3 vortex fouling plug cyl #6 oil

Postby cash » Sep 21 2012, 12:01pm

well....i got the same problems as YOURS! #6 and I'm Living in Belize......i guess i have to buy 1 2nd Engine and Shipping Down....
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Re: 2008 5.3 vortex fouling plug cyl #6 oil

Postby Machster69 » Sep 21 2012, 1:14pm

Was this problem ever corrected? Please update the thread for others who are researching this issue. I recently posted a tsb on the fouling/cracking of #1 and #7, I know its not #6 and I am not currently aware of a tsb on the issue. As far as the flex fuel system, that has little to do with this problem. I am thinking you are referring to the afm system. The dod/afm is what causes cylinder deactivation aka v4 mode. This is known to cause all kinds of issues throughout the motor. However, v4 should not activate when the truck is idled.

The tsb for #1 and #7 is here

spark plug replacement / carbon buildup
Last edited by Machster69 on Sep 21 2012, 1:21pm, edited 1 time in total.
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Re: 2008 5.3 vortex fouling plug cyl #6 oil

Postby cash » Sep 21 2012, 1:18pm

I've make someone rebuild the engine for me..........after 1000 miles......samething happen again......#6 fouling spark plug.....srry about my Carribbean English....so now i don't know what to do.....can i rebuild again? or get a 2nd engine(LC9) from USA................
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Re: 2008 5.3 vortex fouling plug cyl #6 oil

Postby cash » Sep 21 2012, 1:20pm

Any Advice??? Thanks
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Re: 2008 5.3 vortex fouling plug cyl #6 oil

Postby Machster69 » Sep 21 2012, 1:22pm

^^^
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Re: 2008 5.3 vortex fouling plug cyl #6 oil

Postby cash » Sep 21 2012, 1:23pm

^^?? meaning? replace a 2nd engine(LC9)? or rebuild again?
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