PCV routing on Lambdas - free oil consumption mod - Chevy Traverse Forum: Chevrolet Traverse Forum
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post #1 of 29 (permalink) Old 10-25-2012, 02:11 PM Thread Starter
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PCV routing on Lambdas - free oil consumption mod

Trying to diagnose where oil is coming from. The intake valves were growing cauliflower deposits. Any help with diagrams would be great.



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post #2 of 29 (permalink) Old 10-25-2012, 02:14 PM
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Re: PCV routing on Lambdas

Here's a catch can I've come across that looks like it is built quite well. It's not the cheapest, but...

http://www.carformance.com.au/produc...catch-can.html

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post #3 of 29 (permalink) Old 10-25-2012, 03:48 PM
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Re: PCV routing on Lambdas

Here's what I use on my 2007 TBSS:

billetprototypes oil catchcan:
http://www.tbssowners.com/forums/showthread.php?t=74053


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post #4 of 29 (permalink) Old 10-26-2012, 08:54 AM Thread Starter
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Re: PCV routing on Lambdas

Trying to get one thread going about PCV. so i am doing some clean up. Mods feel free to help out.

Holden
[img]

camaro


Any ideas as to why have two PCV lines? Also, upon further inspection the camaro also has two PCV lines. I think it is time for a separate thread on this issue.
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post #5 of 29 (permalink) Old 10-26-2012, 08:55 AM Thread Starter
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Re: PCV routing on Lambdas

What i am thinking is...doing the CTS PCV modification on Red and the catch can on Green

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post #6 of 29 (permalink) Old 10-26-2012, 09:14 AM Thread Starter
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Re: PCV routing on Lambdas

Found this, apparently Green is fresh air for the PCV system....

Quote:
-- Reminder

On the Acadia, Outlook and Enclave, the positive crankcase ventilation (PCV) fresh air tube is difficult to remove from the outlet duct. It is very easy to damage the outlet duct to PCV tube interface point when attempting to remove the tube. Remove the upper intake manifold sight shield for access (fig. 10).


A Do not attempt to disassemble this connection

The tube can be easily disconnected at the camshaft cover fitting and repositioned out of the way (fig. 11), without having to remove it from the outlet duct assembly.



A Rubber tube disconnected from cam cover fitting

TIP: Refer to SI document 1860669.

- Thanks to Gary McAdam
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post #7 of 29 (permalink) Old 10-26-2012, 10:56 AM
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Re: PCV routing on Lambdas

on a side note---
THe new Camaro--- comes with a Catch can- that is to be installed when the car is run on the track.
Maybe some of this will give you somekind of clue....

Camaro 1LE PCV Oil Separator Kit

The increased handling performance of the 2013 Camaro with the 1LE performance package can generate some off-road or track conditions where engine oil can be ingested into the air cleaner through the fresh air tube that connects the port within the right valve cover to the air cleaner. The Chevrolet Performance Positive Crankcase Vent (PCV) oil separator kit can improve this condition. It’s a standard part of the 1LE performance package.



The kit (part number 12653073) is included with other packaged components in the vehicle. It should not be installed during PDI at the dealership. The kit and instructions should be kept in the car. Owners are responsible for installing the oil separator in the car for track use.



The kit is designed for off-road or track use only. The production PCV system should be installed back on the vehicle when driving on public roads.



The kit is not designed for winter driving conditions (ambient temperature should be above 32° F, 0°C).



Kit Contents



The PCV oil separator kit includes:

• Main housing (Fig. 7, A)
• PCV cap/plug (Fig. 7, B)
• Connecting tube (Fig. 7, C)
• Instruction sheet


The kit instructions cover how to remove the PCV tube that features quick connect fittings (Fig. , installing the PCV cap/plug over the valve cover PCV port, and installing the PCV main housing in the oil fill neck in the valve cover. (Fig. 9)






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post #8 of 29 (permalink) Old 10-26-2012, 10:56 AM
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Re: PCV routing on Lambdas

Quote:
Originally Posted by alacran
Found this, apparently Green is fresh air for the PCV system....
Interesting... I've had no issue with the PCV hose-to-intake snorkel connection. There is a tab lock that you must push down and rotate to release the lock.

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post #9 of 29 (permalink) Old 10-26-2012, 11:00 AM
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Re: PCV routing on Lambdas

Quote:
Originally Posted by alacran
Found this, apparently Green is fresh air for the PCV system....

yes- the early models- owners/shops would break those...
it was changed to a quick connect like mentioned above.
Someone posted a pic of a repair shops sloppy fix--- and his fix (much neater)

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post #10 of 29 (permalink) Old 10-27-2012, 12:28 PM Thread Starter
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Re: PCV routing on Lambdas

Here is the answer. Dont have to reinvent the wheel. The Cadillac guys already figured it out. See below for PCV details.

http://www.cadillacforums.com/forums...ddition-2.html

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01-22-11 07:48 PM #20
Doug In NC
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Re: Oil consumption, and possible PCV valve addition

I just started the timing chain job on my friend's 05 and wanted to follow up with some more info regarding the PCV system.

http://i306.photobucket.com/albums/n...b/100_3194.jpg

The first picture above shows where the fresh air for the PCV system comes from. There's a fitting on the air boot after the MAF that allows filtered air to enter the driver's side valve cover.

http://i306.photobucket.com/albums/n...b/100_3198.jpg

This second picture shows the other end of that hose connecting to the valve cover, it's just rearward of the last coil on that bank. If you note the convoluted tubing with the white label, that's the hose and it goes to a 45 degree fitting coming out of the valve cover that is under the brake booster vacuum hose shown in this picture above.

http://i306.photobucket.com/albums/n...b/100_3197.jpg

If you'll look at the intake plenum, there's a black hose that enters both sides of if, just below the shiny freeze plug looking component.

http://i306.photobucket.com/albums/n...b/100_3220.jpg

...

With the orfice removed completely from the intake you can look down in there with a flashlight and see that there's really not a lot of restriction in there (hopefully)

http://i306.photobucket.com/albums/n...b/100_3245.jpg

Above you'll see the where this other end of this vacuum related PCV hose seats on to a fitting from the passenger's side valve cover, just above the yellow fuel line label.

http://i306.photobucket.com/albums/n...b/100_3246.jpg

This picture shows the complete VACUUM side of the PCV system, upper left where it goes in to the passenger side valve cover and the there's a "T" on the backside of the intake and the hoses continue up to the middle/side of each bank.

The part that attaches to the passenger side valve cover has a spring loaded clip (it's just plastic that is bent to provide the spring action) that has to be carefully released to prevent it from braking, see pic below:

http://i306.photobucket.com/albums/n...b/100_3206.jpg

They split the vacuum hose portion so that, in theory, one bank alone is not saturated with all of the crank-case fumes/vapor/oil. Also, there is no function PCV valve like we're used to seeing, no check valve, spring and ball or whatever. It appears to be a restrictive hose where the diameter itself meters the airflow. With the vacuum side PCV hose off you can suck or blow in to any end of it the flow is the same and does not become blocked like a check valve would.

The underside of the intake plenum shows that oil is definitely making it's way in to the intake stream causing the oil consumption that we've been chasing since he bought the car used a year or so ago. The mileage on this model is just over 75,000.

http://i306.photobucket.com/albums/n...b/100_3239.jpg

Additionally, below you'll see two pictures of the spark plug. The first picture shows the white crusty build up that you could expect to see in an engine that has excessive oil making it's way to the combustion chamber.

http://i306.photobucket.com/albums/n...b/100_3248.jpg

This second picture shows the same plug rotated 180 degrees. Based on the lack of deposits on this side it would be easy to believe that the first side is the side facing the intake port itself where the oil would contact first and the second is cleaner because of the lack of exposure.

http://i306.photobucket.com/albums/n...b/100_3249.jpg
http://i306.photobucket.com/albums/n...b/100_3242.jpg
http://i306.photobucket.com/albums/n...b/100_3243.jpg

The last two pictures show the intake manifold itself, still attached to the engine. It's pretty clear that one bank has been exposed to more oil than the other but I really don't have an explanation as to why nor do I have a decent plan for reducing the problem. You can also note where the two hoses come together as one and then lead over to the valve cover. Also, it's important to note that if you plan on doing something with the PCV system you'll need to remember that you're dealing with a Mass Airflow Engine Management system. This means that any attempt to vent the PCV system, add in a catch can with a filter or stick one of those cool little air filters that fit on your pinky on the valve cover then you may create a fuel trim issue leading to a Rich/Lean condition. In other words, if you add in a catch can, it has to be sealed and only pulling air from the properly sealed up valve cover and getting it's fresh air from the post-maf filtered air.

Additionally, the PCV hoses shown above can become brittle on high mileage cars. The convoluted sections will become brittle and won't like to bend out of the way. Additionally, the softer rubber boot that goes to the driver's side valve cover will become softer and may not be a tight seal on high mileage cars as well. This again can cause a MAF trim issue and the solution will be to either replace the hose with a new one or put a hose clamp on it. From my experience, the hose clamp can work good for a while but if the boot is ultra soggy to begin with, the clamp will cut the hose and cause it to fail as well. Finally, if you don't use an OEM replacement hose and try to piece it together with hose from the parts store then you should know that not all hoses are equal. I've work on quite a number of cars where people put heater hose on where PCV hose was used before. This looks and fits fine for a while but give it a year or so and the hose that works for coolant will swell up the longer it's exposed to oil and crankcase vapors.
Doug

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01-23-11 08:47 PM #21
Doug In NC
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Re: Oil consumption, and possible PCV valve addition

http://i306.photobucket.com/albums/n...b/100_3261.jpg

Some additional pictures now that the valve cover is off you can see the orfice in the back of the passenger side valve cover. It's just a small opening so the metering takes place here.

http://i306.photobucket.com/albums/n...b/100_3260.jpg

On the underside you can see that there are no baffles but the design of the cover will prevent oil from the lifters/cams/etc from sloshing directly up in to the orfice. Also, the openings on the underside of the orfice are quite small.

http://i306.photobucket.com/albums/n...b/100_3264.jpg

In addition to the separated passage you can see the back side of the cylinder head is cast in such a way that it will pull fumes from the head but it's certainly not a direct shot.
Basically, the orifice needs to be modified before any catch can be installed. I will post pictures and instructions of the Traverse version of the modification. CTS owners report significant lower oil consumption with this modification.
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