Get a catch can before any mods.

[wjburken]

I didn't. I dumped it into a clear container and it was nasty ass dirty. So I disposed of it. As as far as I know this is all original. I could not find an updated VC for this model and year. 2007 5.3 Tahoe LT 4WD.

On the plus side, you know your catch can is working and kept that crap out of your intake.

Were you doing a lot of heavy driving?

 

[donjetman]

89Surburban, you obviously need the valve cover, and you should probably do the rest of this Technical Servive Bulletin - TSB# 10-06-01-008M .I did it to my engine and it all is well now. I catch 1 oz every 6000 miles now. Before I did it, I was collecting 1 oz every 100 miles.
https://f01.justanswer.com/ebrock63...il+Consumption,+MIL+ON,+Engine+Runs+Rough.pdf

 

[R3cord303]

I didn't. I dumped it into a clear container and it was nasty ass dirty. So I disposed of it. As as far as I know this is all original. I could not find an updated VC for this model and year. 2007 5.3 Tahoe LT 4WD.

No you need the same updated valve cover my 07 did. Lemme get you the part number. I have the same catch can you do. Just waiting to put it on until later this week

 

[R3cord303]

@89Suburban

 

[donjetman]

I put a genuine GM VC# 12570427 on mine, from amazon for $111.
The TSB says to install valve cover # 12570427 on 07-08, and valve cover # 12642655 on 09 and later engines ONLY. There is a *NOTE* stating "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". There is a lot more scary info in it. I suggest you read it thoroughly.

 

[donjetman]

Here are a couple of threads on the "valve cover" and "oil consumption" subjects

https://www.tahoeyukonforum.com/thr...tor-oil-consumption-tsb-10-60-10-008m.108493/

https://www.tahoeyukonforum.com/threads/valve-cover-change-cleanup.108604/

 

[89Suburban]

On the plus side, you know your catch can is working and kept that crap out of your intake.

Were you doing a lot of heavy driving?

Yes apparently it is working very well. I baby this rig as much as possible.

89Surburban, you obviously need the valve cover, and you should probably do the rest of this Technical Servive Bulletin - TSB# 10-06-01-008M .I did it to my engine and it all is well now. I catch 1 oz every 6000 miles now. Before I did it, I was collecting 1 oz every 100 miles.
https://f01.justanswer.com/ebrock63/cec66346-04c1-48e0-98a6-74c35af2c84e_2014+Engine+-+Oil+Consumption,+MIL+ON,+Engine+Runs+Rough.pdf

I appreciate the info. That is some good results. Are you high mileage like mine?

I put a genuine GM VC# 12570427 on mine, from amazon for $111.
The TSB says to install valve cover # 12570427 on 07-08, and valve cover # 12642655 on 09 and later engines ONLY. There is a *NOTE* stating "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". There is a lot more scary info in it. I suggest you read it thoroughly.

I am scared of scary info, I must find the time to read it though and be educated. What are your thoughts why this filled so fast?

Here are a couple of threads on the "valve cover" and "oil consumption" subjects

https://www.tahoeyukonforum.com/thr...tor-oil-consumption-tsb-10-60-10-008m.108493/

https://www.tahoeyukonforum.com/threads/valve-cover-change-cleanup.108604/

Ok I need to find the time to read up on these and digest it, much appreciated.








On a positive note here is the new hose routing pic:







And I did a swab test of the dipstick on a rag to see what kind of residue it left behind:

 

[wjburken]

On a positive note here is the new hose routing pic:

Nice looking - Very Clean!

 

[R3cord303]

@89Suburban the valve cover cut the oil consumption on my engine in half almost. The issue is that the OG valve covers have the inlet for the PCV right above one of the rockers. So when it goes into V4 mode the lifters shoot oil up the pushrod and it squirts into the PCV inlet, and gets sucked into the intake. The updated valve cover moves the inlet to the rear so it won't suck in the oil. My engine had 221,000 miles on it.

 

[gooffeyguy]

How do you have it plumbed? Input of catch can runs to where, valve cover or top of intake?

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[89Suburban]

@89Suburban the valve cover cut the oil consumption on my engine in half almost. The issue is that the OG valve covers have the inlet for the PCV right above one of the rockers. So when it goes into V4 mode the lifters shoot oil up the pushrod and it squirts into the PCV inlet, and gets sucked into the intake. The updated valve cover moves the inlet to the rear so it won't suck in the oil. My engine had 221,000 miles on it.

What if the V4 mode is bypassed with a Range Technology device?

How do you have it plumbed? Input of catch can runs to where, valve cover or top of intake?

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

It is plumbed correctly. Inlet to PCV on VC and outlet to intake manifold.

 

[07Burb]

Yes apparently it is working very well. I baby this rig as much as possible.



I appreciate the info. That is some good results. Are you high mileage like mine?



I am scared of scary info, I must find the time to read it though and be educated. What are your thoughts why this filled so fast?




Ok I need to find the time to read up on these and digest it, much appreciated.








On a positive note here is the new hose routing pic:



View attachment 229369



And I did a swab test of the dipstick on a rag to see what kind of residue it left behind:




View attachment 229370

Hose reroute looks good, man

 

[R3cord303]

What if the V4 mode is bypassed with a Range Technology device?



It is plumbed correctly. Inlet to PCV on VC and outlet to intake manifold.

I suppose it could still shoot some up there though it should be quite a bit less than that. That seems like quite a bit. Newer valve cover also adds a baffle to reduce vapors. Keep an eye on it for sure.

 

[donjetman]

What if the V4 mode is bypassed with a Range Technology device?

My engine, L92, didn't come from the factory with AFM V4, so that has nothing to do with oil consumption in my case.

I think the cause for oil consumption is the poor design of the original valve cover pvc system. It allow the engine to suck a lot of oil into the induction system, eventually causing the rings to stick, which causes even more oil consumption.

 

[89Suburban]

Ok week three was only half full.

 

[HiHoeSilver]

Ok week three was only half full.

Still a lot.

 

[89Suburban]

Still a lot.

Yes.

 

[Sam Harris]

3 oz or so after a full 5k oil change interval:

 

[HiHoeSilver]

3 oz or so after a full 5k oil change interval:

Mines about the same.

 

[M3kanic]

roughly 5k of highway.

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