to clarify: the blowby gasses are directed out of the rocker cover via the rocker cover port, to the turbo inlet, and also through the inlet manifold plenum. The blowby gasses that are directed to the plenum come up from the block, through a passage in the head, to the rocker cover mezannine; along two biscuit seperators, and then back down the head to the inlet manifold port, where a pc valve permits "seperated" gasses into the inlet manifold plenum to be returned to the engine in combustion. The theory all goes to heck when the pcv valve sticks, or the biscuit seperators cant deal with the oil. Which is often.

so. we remove the pcv valve, and block the entry to the plenum ,and take the gasses out of the top of the inlet manifold to the seperator.

simple really

 

I wanted to provide some insight, as i have just finished doing this over the weekend.

This only took me and a friend 4 hours to get done. basically an hour per cyclinder.

1. Make sure you have everything covered in the engine bay and around as this stuff does get everywhere.

2. Have a well operated shop vac with a narrow attachment, i used my normal vacuum attachment to get in the small areas of the valves.

3. Purchase a blast gun that does not have a hopper or bag on the actual gun, this will make you get annoyed as there is not much room to move the gun around and you have to keep refilling the gun up.



I bought this one from harbor freight for 30 bucks. It basically has a container to hold all the media and a line from the bottom of the container with a long hose to connect to the gun to allow you to move back and forth easier. Also no refilling time just blast away.

4. Try to get some picks or tiny flat screw drivers to scrap away the gunk behind the valves, and in and around the valves, it good to try to scrap some of the gunk off before blasting it with the shells so you don't have to do lots of blasting.

5. take your time masking off everything, as the prep work is what will make this job a clean one or a messy one.

6. Make sure you don't blast long burst, as media will just collect in the cylinder.

7. While you blast you can put the vacuum in the cyclinder at the same time to suck up all the media while blasting. (small attachment comes in handy here).

8. enjoy blasting as this is fun part.

here is my results after 85k miles. I bought the car with 80k miles.

 

I believe I need to do this soon. I am at 63k. What PSI should be run from the compressor? The OP said 110. Is this a good PSI? It seems to work for him.

 

Depends on what the material gun calls for, some max around 90-100psi. Just make sure you wear ear plugs, makes stupid high pitched loud sound when you go over an edge or are working in the port randomly.

 

Anybody do one of these on the supercharged engine?

 

Should not be needed because of the port injection. If it were an issue the cleaning would be the same mostly

 

They can still get bad, just takes more and normally a failed or failing pcv

 

QUESTION: my engine has 67000miles on it and i was wondering what i can do to prevent this from happening to my low miles engine?

 

Your engine is not low miles in regards to valve coking on the LNF. At 75k miles my car needed it bad. Yours probably does too.

 

k then what can i do to stop it from getting worse? i dont feel safe throwing anything in my cylinder head no matter who tells me its safe...just would liek to prolong this engine as far as i can before i need to drop in a new one...

P.S in canada (where im from) under 200.000kms is considered low kms and under 100,000 is brand new...my car has 109.000kms

 

 

Powell oil separator is it.

I understand your concern about cleaning the valves. It's not for everyone. I'm dreading doing it again

 

Awesome post on how too clean carbon-buildup. The oil separator seems like a great idea. I just purchased a 09 ss/tc and was researching known issues. I was wondering if anyone has tried meth injection to reduce buildup?

 

Sub'd for my GS.

 

its just walnuts. gm would do the same thing if you asked them. and you clean the valves so as soon as the car is started it is all burned off because its just walnut shavings. not gonna hurt anything.

 

Is there anything VERY IMPORTANT i should know about this process before doing it? I understand that the valves need to be closed, things need to be covered and taped off and to take my time. I just don't want to **** anything up

 

here you go man this should help with all your questions/concerns lol

https://www.cobaltss.net/forums/how-...emoval-304188/

 

LOL was this sarcasm?

 

 

why????

 

You linked the same thread we're in

 

oh jesus effing christ!!! i thought it was the one page rudy from FMSR started years ago my bad guys

 

 

saw it when exninja mentioned it

 

hey atleast i gave everybody a good laugh lmfao