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I have read this thread with much interest, as I just had to pay $2,000 to have the rear main seal replaced. My GMC Terrain is just 3 years old with 70000 miles.
Someone please tell me if I am wrong, but as I understand this 2.4 liter ecotech engine, there is no pcv valve. The pcv system consists of a small metering hole in the intake manifold which vents to all four cylinders through the intake ports. This let's the crankcase pressure be let into the intake system to be burned. Then there is also the valve cover vent tube from the valve cover to the air intake and then through the throttle body. This leads me to think that if that little whole in the intake manifold plugged, the pressure could still vent through the valve cover vent. Is this correct? Also this would mean the pcv vent AND the valve cover vent would half to plug ( as in freezing weather) to blow the seal. Is this correct? If so, installing an oil catch can in the valve cover vent would prevent this problem?

Mark
 

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This leads me to think that if that little whole in the intake manifold plugged, the pressure could still vent through the valve cover vent. Is this correct?
Yes that is correct if the inlet tube and the air intake plenum are not blocked by ice - goo - etc.
Also this would mean the pcv vent AND the valve cover vent would half to plug ( as in freezing weather) to blow the seal. Is this correct?
That question really has no clear answer, the PCV orfice opening into the intake manifold is tiny and with an older engine having higher blowby, it might still build enough pressure to blow out the rear main seal. ( or more likely just freeze over )
If so, installing an oil catch can in the valve cover vent would prevent this problem?
No, it might help, but the air inlet plenum has a chamber where water vapour condenses and freezes. ( take off your inlet plenum turn it over and look where the tube connects... ) The valve cover vent tube enters that chamber at the bottom and gets blocked by ice etc. I would recommend that you relocate that valve cover vent tube so that it enters at the top of the chamber above any ice etc. and have all plumbing slope so that nothing can collect and freeze.
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Hello- I have a 2013 Terrain 2.4 Ecotec. Well within the SB 14882 limits. A few months back, I had been running some errands (all short drives). Weather was about 6 degrees. Engine began to run a bit sluggish and no lights on instrument panel. Pulled into a gas station and stalled. I thought that maybe I had some moisture in the gas, so I added some fuel cleaner and filled up my tank. I went to drive home which is about 3/4 mile from the gas station. It stalled again in the parking lot of the gas station but re-started. I got home and parked in the driveway. Overnight temps were about 2 degrees. Went to start my car and the entire engine shook. Oil light did NOT come on but the CEL did. Terrain wouldn't start. Saw a huge puddle of oil underneath. Ended up being a frozen PCV. No prior warnings about low oil, no indication about excess oil consumption (never even got any notices about the Excess Oil Consumption Litigation. Had it towed to a GM Dealer. I was told that the only way to repair the engine was to replace it. Was never told what failed. The advisor said that GM would kick in $640 and my share would be $5,700. Called GM and had a ticket opened and asked for a District Manager. Talked to him and he he said that GM would do a 25/75 split. My end would be just over $1,500. Negotiated it down to $1,111. Was told that I would get a NEW engine. Ended up with a remanufactured engine. Drove to NC for my daughter's wedding a few days after I got it back and it died on the freeway (I did make it to my daughter's wedding). I was told that there was oil sludge and metal shavings in the intake manifold that got into the #1 cylinder and blew it up. Now I have a 2nd remanufactured engine. Dealer also replaced the Intake Manifold (because of the oil sludge and metal shavings) and the Catalytic Converted (because GM was concerned that the sludge/shavings made their way tot he converted). GM says that my VIN isn't linked to the 14882 bulleting which I find odd since it is linked to the Excess Oil Consumption Litigation as well as a new one involving the Catalytic Converter.

What is unusual is that out of the 3 issues, GM has only linked 2 of them to my VIN. No explanation of why the 14882 bulleting is not listed. I was told that the Brand Quality Managers tried getting more VINs linked but they got turned down. I was also told that I had to have an Excess Oil Consumption problem BEFORE 14882 for the frozen PCV issue came into play. By the way, Excess Oil Consumption has nothing to do with a frozen PCV in my opinion. Can the sludge in the Intake be caused by excess oil consumption?
 

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By the way, Excess Oil Consumption has nothing to do with a frozen PCV in my opinion.
No its the other way around... A frozen PCV system is more likely to happen in an engine with excess oil consumption.
If oil can get past the rings into the combustion chamber causing oil consumption then combustion chamber gases will certainly get past the rings into the crankcase. These gases are mostly water vapour ( like what comes out of the exhaust ) and as they pass through the cold PCV system, they condense, collect and freeze. Yes there is always some blowby even in a healthy engine, but there is more blowby in a worn engine. ( one that needs new pistons and rings )
 

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I see a lot of mention about the vented oil fill cap. Is there a part number for these two caps and if so what is it?

Mark
 

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I see a lot of mention about the vented oil fill cap. Is there a part number for these two caps and if so what is it?

Mark
Go to google and enter vented oil cap for 2.4L. Chev.
Lots of choices, I went with the FC 219 for my Equinox and Encore.
Cheers
 

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So the sludge in the intake was caused by excess oil consumption, even if it didn't go through a lot of oil? I always took my Terrain in for oil changes and never saw the dipstick to understand if it was going through oil.
 

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No its the other way around... A frozen PCV system is more likely to happen in an engine with excess oil consumption.
If oil can get past the rings into the combustion chamber causing oil consumption then combustion chamber gases will certainly get past the rings into the crankcase. These gases are mostly water vapour ( like what comes out of the exhaust ) and as they pass through the cold PCV system, they condense, collect and freeze. Yes there is always some blowby even in a healthy engine, but there is more blowby in a worn engine. ( one that needs new pistons and rings )
How do I show that the sludge in the intake manifold was caused by the blowby?
 

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Mods any chance we could create a section just for 2.4 owners? I'm not trying to be mean or inconsiderate but this chit really gets old...
 
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Go to google and enter vented oil cap for 2.4L. Chev.
Lots of choices, I went with the FC 219 for my Equinox and Encore.
Cheers
I looked up the fc219 cap. The photo looks like my cap, but it says it will not fit the 2017 Terrain. I have the 2.4 ecotec engine. I hate to order it if it won't fit.

Mark
 

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The Delco FC219 oil filler cap should fit on a 2.4L ecotec. Its the one I use. It may not be listed as the original cap has no pressure relief.
 
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