PCV VALVE ISSUES, PRE DETONATION, CARBON BUILD UP

[SultanWild]

Catch can pics have been posted here for years and they never have more than a few ounces in them.

Apart from an oil catch can, You can check TSB 09-012-22 for more information and clarification.

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[SultanWild]

TSB 09-012-22

 

[SultanWild]

Hmmmm, seems like maybe bad valve guides? But who knows based on just a photo.

Going to agree it probably is not just a bad pcv. Did you see visible smoke out the tailpipe?

Something else going on here, imo... preignition/detonation, sounds like really bad gas. Don't take this wrong but when I lived in KSA they loaded a regular tanker truck of fuel with diesel instead of gas and I think they never really cleaned it up right. Destroyed a government truck. Also saw them using fuel trucks as water trucks and vice versa. Yeah, never drank that tap water again...

 

[mwilk012]

Apart from an oil catch can, You can check TSB 09-012-22 for more information and clarification.

Brother you're going to have to do just a little bit of critical thinking here. Why is it that only some people are affected by this? A very small number, in fact. Why do they have no problems with oil fouled spark plugs, misfires, or oil consumption?

 

[Jeep Wick]

Catch cans do very little in my experience. People use them to prevent carbon buildup on direct injection motors, but they mostly collect water vapor. The 3.6 is the older multi-port injection and really should not be affected by carbon. My 2020 has twice the mileage of the OP and this is the first I've heard of this. But I do run 93 octane often which I think is good for the high compression.

 

[Beachcomber72]

These catch can threads are really making me chuckle tonight…

it’s amazing that after all the many many years the well respected and hard driven 3.6 pentastars that have graced the highways and trails all the sudden supposedly need catch cans. There are too many of you that got duped in to a snake oil gimmick product.

they certifiably on paper cause more harm and offer zero benefit. Quit with the hype.

 

[L.S.F]

Hi @L.S.F

Removing the cylinder heads will allow more access to clean the already built up carbon deposits. But even after cleaning them manually and replacing the PCV valve will fix the issue for a short while only, what i have done after cleaning the carbon and replacing the PCV, I installed an oil catch can and used a can of sea foam spray top engine cleaner, It worked great for me.

My advice if you end up removing cylinder heads and replacing the PCV, Install an oil catch can immediately after this big job.

Thanks for the info and time mate. Upgrading to high octane fuel and applying octane boosters once in a while has not made the issue go away. Let's see how this piston clean and pcv valve replacement goes.

 

[SultanWild]

Brother you're going to have to do just a little bit of critical thinking here. Why is it that only some people are affected by this? A very small number, in fact. Why do they have no problems with oil fouled spark plugs, misfires, or oil consumption?

My dear don't think I'm arguing with you, when this first happened to me I was totally upset with a brand new vehicle doing this. After a research i found out it is not only me. In fact I'm more surprised that this was not an issue with the first gen 3.6 pentastar and never experienced this in a JK. Maybe when pentastar upgrade came out with some compression ratio changes or the way they designed the PCV, I'm not sure. Believe it or not, my dealer had replaced so many engines under warranty for many customers and the issue came back again. By the way my spark plugs where totally fine and clean. So I don't know what is going on, and Stellantis issued a TSB for this and they are aware of this issue. TSB issued for a reason.

 

[SultanWild]

Thanks for the info and time mate. Upgrading to high octane fuel and applying octane boosters once in a while has not made the issue go away. Let's see how this piston clean and pcv valve replacement goes.

Good luck and wish you all the best.

 

[SultanWild]

Catch cans do very little in my experience. People use them to prevent carbon buildup on direct injection motors, but they mostly collect water vapor. The 3.6 is the older multi-port injection and really should not be affected by carbon. My 2020 has twice the mileage of the OP and this is the first I've heard of this. But I do run 93 octane often which I think is good for the high compression.

Appreciate your response, but believe it or not, i never ever used an oil catch can in any vehicles i owned and I own now, only for the JL when this issue happened and it worked great for me. By the way I sold the JL.

 

[SultanWild]

These catch can threads are really making me chuckle tonight…

it’s amazing that after all the many many years the well respected and hard driven 3.6 pentastars that have graced the highways and trails all the sudden supposedly need catch cans. There are too many of you that got duped in to a snake oil gimmick product.

they certifiably on paper cause more harm and offer zero benefit. Quit with the hype.

I understand you sir, but believe it or not, i never ever used an oil catch can in any vehicles i owned and I own now, only for the JL when this issue happened and it worked great for me. Never used it and never happened in a JK, but unfortunately what went wrong with 3.6 pentastar upgrade, not sure

I know not everyone is experiencing the same, but in my jeep community majority are experiencing it. TSB issued for a reason.

 

[mwilk012]

Appreciate your response, but believe it or not, i never ever used an oil catch can in any vehicles i owned and I own now, only for the JL when this issue happened and it worked great for me. By the way I sold the JL.

"worked great for me but I sold it already"

The PUG1 motor is a higher compression engine than the previous iteration of the 3.6, but the PCV design is functionally the same and the pentastar engine has NEVER in history consumed an appreciable amount of oil. It's a tuning problem combined with low quality gas and oil.

 

[Beachcomber72]

I understand you sir, but believe it or not, i never ever used an oil catch can in any vehicles i owned and I own now, only for the JL when this issue happened and it worked great for me. Never used it and never happened in a JK, but unfortunately what went wrong with 3.6 pentastar upgrade, not sure

I know not everyone is experiencing the same, but in my jeep community majority are experiencing it. TSB issued for a reason.

I completely understand the TSB for the PCV, just don’t understand the majority of people who feel that adding a catch can is some type of benefit.

 

[SultanWild]

"worked great for me but I sold it already"

The PUG1 motor is a higher compression engine than the previous iteration of the 3.6, but the PCV design is functionally the same and the pentastar engine has NEVER in history consumed an appreciable amount of oil. It's a tuning problem combined with low quality gas and oil.

Yes, sold it exactly after 1 year and 7 months after the repair, and no issues were there at all. and again TSB came out for a reason.

 

[SultanWild]

I completely understand the TSB for the PCV, just don’t understand the majority of people who feel that adding a catch can is some type of benefit.

As I mentioned earlier, I have never installed an oil catch can in any of my vehicles, only in JL, Yes it will not stop anything from happening but will help reduce the amount of oil that goes through faulty PCV.

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