Great Write-up Andrei, As usual!
Thanks for all the detail!
Thanks for all the detail!
I don't have a picture, but if someone wants to pull theirs off and take a picture of it, I can post it. Don't know the answer to your other questions yet.De we have any idea of what type of check valve is used at the turbo, and what it looks like viewing through the connection of the corrugated tube? Wondering if this check valve could be cleaned and inspected without removal of the turbo.
I've seen something similar to this over on the sonic forum, but this is the first time someone has mentioned two check valves in the PCV system.
Note that some of these can be failing from burst disk fatigue since the crank case is constantly under changing pressure, so you can't assume that every time one fails, that there's an underlying root cause.Great write up! It really cleared up my understanding of our PCV system! With this new understanding though I'm now wondering why when someone has a PCV problem you usually only hear of them replacing the valve cover (burst disk), and GM has extended the warranty on it. Seems like its most likely that one of these other valves have failed causing the burst disk to fail.
To my knowledge GM has not created an extended warranty for the PCV system like they have for the water pump, and battery cable. I've been under a rock for the past few months, if anyone has details of a extended separate campaign like the water pump please post details. The powertrain warranty covers the intake and the valve cover provided your car is still under powertrain coverage.Great write up! It really cleared up my understanding of our PCV system! With this new understanding though I'm now wondering why when someone has a PCV problem you usually only hear of them replacing the valve cover (burst disk), and GM has extended the warranty on it. Seems like its most likely that one of these other valves have failed causing the burst disk to fail.
No warranty to my knowledge. That would be news to me as well.To my knowledge GM has not created an extended warranty for the PCV system like they have for the water pump, and battery cable. I've been under a rock for the past few months, if anyone has details of a extended separate campaign like the water pump please post details. The powertrain warranty covers the intake and the valve cover provided your car is still under powertrain coverage.
I think a lot of people are doing the valve covers first, as they are easy, but it's probably the case that the intake missing the check valve is what's causing the valve covers to burst. If your driving style and conditions are right, maybe you can drive for quite a while with a intake check valve missing. "UpstateNY" or something like that is on his third valve cover, and he has no check valve in the intake. With the high mileage on his car he has decided not to address the check valve issue.
To my knowledge the intake is only available loaded with the throttle body and new injectors. A $280-300 part. When will the aftermarket start supporting intakes with check valves for this car? Or better yet a replacement check valve.
I know GEN 2 1.4's use a different system. Hopefully it's not this problem prone..
OK, maybe I'm wrong... I thought I had gotten one of those letters from GM extending the warranty on the valve cover. I'll look through my stuff, if not we can deduct from my credibility pointsGreat write up! It really cleared up my understanding of our PCV system! With this new understanding though I'm now wondering why when someone has a PCV problem you usually only hear of them replacing the valve cover (burst disk), and GM has extended the warranty on it. Seems like its most likely that one of these other valves have failed causing the burst disk to fail.
They aren't that expensive to replace even if you have the GM dealer do it. The part is like 50 bucks and it is real easy to get to so the labor shouldn't be too bad.I really Hope My orginal PCV valve goes bad before my 5 year warranty expires one year from now...I'm only at 35,000 miles will be 45,000 by next summer..
You'd have to plug up that port to do a PCV delete, but theoretically you could, as long as the EPA doesn't find out.I like that part of using epoxy to plug hole if valve is missing in the intake. Any chance of doing a PCV delete? Its crossed my mind.
I don't know of any oil vapor that the catch can would catch, that the valve cover doesn't under normal operation. Every catch can I've seen installed on these cars does nothing but accumulate moisture, and a good baffled catch can would run you well over $150 for little to no real benefit. In a 15,000 mile oil drain interval (with AMSOIL signature series), I didn't consume any measurable amount of oil (the line on the dipstick was the same).Deleting wouldn't be any worse then running without cats. If I were to do the delete Im not sure if the pcv hose from intake can be ran to a catch can and vented to the atmosphere and then plug the turbo intake end of hose. If epoxying the intake manifold where valve would be missing would that cause the crankcase to no longer be under a vacuum? If my nipple valve goes missing again and oil collects at the TB and out of 5y/100k PW I will be doing this instead of replacing whole intake manifold assembly.
Crankcase would not be under vacuum any time you were under boost (so basically all the time in these cars). Great way to blow out all the other seals in the motor.Deleting wouldn't be any worse then running without cats. If I were to do the delete Im not sure if the pcv hose from intake can be ran to a catch can and vented to the atmosphere and then plug the turbo intake end of hose. If epoxying the intake manifold where valve would be missing would that cause the crankcase to no longer be under a vacuum? If my nipple valve goes missing again and oil collects at the TB and out of 5y/100k PW I will be doing this instead of replacing whole intake manifold assembly.