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    2005 Tahoe PCV Hose Routing

    The catch can seems to be popular approach. Before the high mileage (and well abused) hot rod engine in my Camaro was rebuilt, I incorporated one in an effort to keep the oil out of the intake as the blowby was excessive. It did it's job. As for the Tahoe, I may possibly try that as well. As...
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    2005 Tahoe PCV Hose Routing

    I figured as much. Thanks for verifying. If the weather in this part of the world settles down, I'll be digging into this on the weekend.
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    2005 Tahoe PCV Hose Routing

    I'll have to check the LS3. It's been hot rodded and is in a 69 C10 so the original layout is just a memory. There may be something in the picture history though. As for the head gasket, that was an initial thought although, as stated, the difference in compression kind of points otherwise. If I...
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    2005 Tahoe PCV Hose Routing

    Now, back to the thread title. Is there a valley pan hose in these engines? Which would be a 3rd hose. I don't see it. FTR, the crate engine LS3 we have does have one.
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    2005 Tahoe PCV Hose Routing

    Yes. 706 heads. Interestingly that may be the problem with one of the other Tahoe's in the "fleet". The 03 has two weak cylinders. 5 and 7 with one at about 70 psi cranking pressure and the other around 130. Doesn't appear to be a head gasket and the suspicion is a couple of burnt valves. Not...
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    2005 Tahoe PCV Hose Routing

    Other posts have popped up since I answered the first. Especially the oil smoke on start up. Seems the clogged PCV will result in oil pooling in the intake plenum. Then it's ingested when next started. To the poster that mentioned valve guides...yes sir. That was my initial thought. Then this...
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    2005 Tahoe PCV Hose Routing

    Fair comment and I have no illusions as to what I'm contemplating will solve the problem. It's more along the lines will it alleviate the problem and then I have a direction on where to go. A cause and effect sort of thing. It used to be, before any of these buggies existed (this generation of...
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    2005 Tahoe PCV Hose Routing

    The Tahoe (2005 LM7) is giving that telltale sign of a plugged PCV system with a large cloud of blue smoke on startup. It's also leaking oil which is a condition that's getting worse. Research points to the above condition. I'm not necessarily asking for the repair procedure as I'm just going...
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    2005 LM7 and Sea Foam

    A part number is all I need. I can figure out a source. I've the same sort of search M.O. (find it one place and buy it from another) and can take what you've provided and run with it. Thanks again.
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    2005 LM7 and Sea Foam

    GREAT info! And thanks. Pricing is far better than what I had seen with an initial, but admittedly light, look through too. What vendor is that?
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    2005 LM7 and Sea Foam

    The devil is in the details and there's a knock on effect with the Gen IV valve covers. Not having digested all of that information (from here and elsewhere) there are other component changes that need to be addressed. The boss cast into the cover I believe is different between years as is the...
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    2005 LM7 and Sea Foam

    An old school trick that we employed decades back. Seems too that water injection, again back in the day, was an effective means of keeping combustion chambers and piston tops clean. That said, I'll take the carbon buildup. Maybe it'll add a bit to the compression ratio and give a little bump in...
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    2005 LM7 and Sea Foam

    I read his reply although i didn't appear to me to clearly identify what needs doing. The TSB didn't list a 2005 LM7. That's nothing on donjetman though. In all fairness, I didn't dissect it as I will going forward but that's mostly because I've kind of zeroed in on that the PVC system is gunked...
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    2005 LM7 Valve Cover Upgrade: What's the Latest?

    I will certainly post back with what I find and what results I get, if any, after cleaning. That said, I'm committed to indoor projects until the end of April so don't hold your breath. And once a swing my attention to the outdoor jobs, the truck will be on the sidelines for a while still. But...
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    2005 LM7 and Sea Foam

    Sometimes a circle gets to where you want go! :p
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    2005 LM7 Valve Cover Upgrade: What's the Latest?

    That's my approach to just about anything vehicle related. I've never been to gm parts giant though and I'll definitely take a look. That said, I would think that although the original valve cover baffle design was problematic, if cleaned to an as new condition, there should be some casue effect...
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    2005 LM7 Valve Cover Upgrade: What's the Latest?

    I started a thread about adding Sea Foam via a vacuum line to address a undoubtedly plugged PCV system. Among other issues. https://www.tahoeyukonforum.com/threads/2005-lm7-and-sea-foam.157832/#post-2034167 Now I'm pursuing what appears to be a popular fix for a common problem on several...
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    2005 LM7 and Sea Foam

    So, the TSB doesn't address a 2005 or an LM7. https://static.nhtsa.gov/odi/tsbs/2014/MC-10114272-9999.pdf And the updates apparently are in their 3rd revision. So, if anyone here has the latest information, I'm all eyes. The search continues... And another thread started too.
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    2005 LM7 and Sea Foam

    I've searched. Trust me. And am still searching. Now I'm going down the updated valve cover rabbit hole... Thanks for the link. On my way.
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    2005 LM7 and Sea Foam

    No valve in this case. Just a fixed orifice so no rattle. As for the valve covers, that subject has come more than once and certainly something I'll investigate. They're original equipment that's for sure. Despite this black Tahoe being as "shiny as a new penny" on the topside, the underside...
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    2005 LM7 and Sea Foam

    Seems the valve cover cleaning and or replacement might be the cure. Which is far easier than valve guide seals. As for flex fuel, not in this case. And Techron, that's difficult to find but not impossible here in Canada. I did manage to Amazon order Berryman's B12 and added a few of those to...
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    2005 LM7 and Sea Foam

    Very common practice on the LS engine swap platforms. I run one on my hot rod Camaro although that's with a Gen 1 SBC. Very helpful with a tired engine.
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    2005 LM7 and Sea Foam

    You know, it's interesting that the further this conversation goes, the more I think it is a PCV problem and not the valve guide seals. When the warmer weather arrives, the valve covers are coming off for sure.
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    2005 LM7 and Sea Foam

    That's also a concern of mine. That oil burning isn't doing the cat any favours that's for sure. It's only a matter of time before another DTC gets thrown for just that.
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    2005 LM7 and Sea Foam

    There's no PCV valve, per se, on an LM7. It has a fixed orifice type of PCV control and that orifice is at the rear of the driver's side valve cover. THIS is the part that gets plugged. With a plugged orifice, the result is increased crankcase pressure. That's where the leaks come from. And...

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