Deciding to give up on Jeep

[RougeShot12er]

It’s not a poorly designed engine. It’s a good, proven engine. It’s just plagued with post Covid poor quality parts supply issues. However, that likely has nothing to do with your misfire issue. I haven’t had good luck with Jeep dealerships, but I’d still try a different dealership.

The 3.6L engine has been eating cams and having misfire issues long before covid, and before it became the PUG. The fact that is is still a issue in 2026 says a lot.

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[23black]

Service the electric components first . For 700.00 you can buy all 7 coil packs. Spark plugs are 24.15 a piece injectors 5or 600.00 can remember was total of 1100 dollars that came in a box 6"×6"×12" long box .
Ordered from @AllMoparParts.com . Order correct everything perfect condition.
And was shipped within a week very quick.
Benny will take care of you and usually offers a shipping rebate

$1100 usd to buy and install my own parts? On the off chance it may fix my fully warranted vehicle? A week for shipping? Tou have a lot more patience and money than I am willing to waste. Two for two on the 3.6 Pentastar. When my 2013 needed a completely new head at its first oil change it didn't throw any codes either. Getting 50 plus misfires on cylinders 3 and 5 and much lower numbers on the rest.
I had hoped 10 years of development may have made a better product.

 

[ChrisNLA]

The 3.6L engine has been eating cams and having misfire issues long before covid, and before it became the PUG. The fact that is is still a issue in 2026 says a lot.

Before the PUG it was an entirely different issue, and it wasn't the cam.

Prior to PUG the engine did not have variable valve lift. It was the bearings inside the followers that were falling apart. You replaced all of the followers with the updated model to solve the problem, and as long as follower debris didn't damage the cam, you were fine.

With the introduction of the PUG, they added variable valve lift and additional lobes on the cam. The follower for high lift is solid (non roller) and for some people the solid follower eats up the cam, and the belief there is could be a metallurgy issue.

I agree, I have seen my share of Pentastars have odd and end misfire issues that were completely unrelated to the cam or the followers. It was coils, plugs, oxygen sensors, fuel injectors, etc.

 

[ChrisNLA]

$1100 usd to buy and install my own parts? On the off chance it may fix my fully warranted vehicle? A week for shipping? Tou have a lot more patience and money than I am willing to waste. Two for two on the 3.6 Pentastar. When my 2013 needed a completely new head at its first oil change it didn't throw any codes either. Getting 50 plus misfires on cylinders 3 and 5 and much lower numbers on the rest.
I had hoped 10 years of development may have made a better product.

At least you don't have a Tundra I-Force Max or a Chevrolet 6.2L - you'd be looking at outright engine failure. At least your PUG still runs

 

[ChrisNLA]

$1100 usd to buy and install my own parts? On the off chance it may fix my fully warranted vehicle? A week for shipping? Tou have a lot more patience and money than I am willing to waste. Two for two on the 3.6 Pentastar. When my 2013 needed a completely new head at its first oil change it didn't throw any codes either. Getting 50 plus misfires on cylinders 3 and 5 and much lower numbers on the rest.
I had hoped 10 years of development may have made a better product.

You could have a very minor issue on your hands, but I understand the frustration.

I'm not sure what anyone else can tell you other than keep trying new dealers, or move on from Jeep. The only other thing is to dig in yourself, which sounds like you aren't interested in. Again, I get it.

They're just vehicles. If you can stomach the money just wash your hands of it and roll along.

I used to get rid of them (vehicles) every few years for a reason.

 

[WILDHOBO]

Passenger side rear of motor right in front of the transmission . Easy to see . Let me get a pic.
Edit for pic:
Yes I have some old oil on there from the bad PCV valve I changed don't pay it any mind keep forgetting to wipe it off.

Thanks. I don’t judge. Mine is filthy.

 

[Stan H]

You could have a very minor issue on your hands, but I understand the frustration.

I'm not sure what anyone else can tell you other than keep trying new dealers, or move on from Jeep. The only other thing is to dig in yourself, which sounds like you aren't interested in. Again, I get it.

They're just vehicles. If you can stomach the money just wash your hands of it and roll along.

I used to get rid of them (vehicles) every few years for a reason.

Yes I did to until I came home to Jeep , all vehicles have issues, and with this Giant Lego set I intend on building it the way I want it . Not how they sold it. It will ultimately be way more capable then off the lot stock.
OP I still think you should try crank sensor .

 

[ChrisNLA]

Yes I did to until I came home to Jeep , all vehicles have issues, and with this Giant Lego set I intend on building it the way I want it . Not how they sold it. It will ultimately be way more capable then off the lot stock.
OP I still think you should try crank sensor .

If I am going to put up with problems, the Jeep does make it more palatable as there are many aftermarket solutions for things, and if I need technical solutions, the enthusiast base is so deep that you can find nearly any bit of info you may need to resolve a problem.

As a result, the two Jeeps I have had have stuck around longer than any other vehicle I have owned - though my current Camaro has been around a while now too (since early 2019).

 

[BearFootSam]

It sounds like a poorly designed engine that no dealerships can't fix. They don't seem to know why there is, what there is, or what is a 'misfire'.
They can't even read a fault that I can hear, feel, and document with an aftermarket Jscan obt2 reader.

The 3.6 isn’t a perfect engine but if the issue you are experiencing was related to the design we’d be seeing more of it with millions of these things running around. I’d find another dealer or independent mechanic to take a look.

How are you under warranty btw at 66k? If you bought the extended warranty, well that’s your first mistake.

 

[MPMB]

$1100 usd to buy and install my own parts? On the off chance it may fix my fully warranted vehicle? A week for shipping? Tou have a lot more patience and money than I am willing to waste. Two for two on the 3.6 Pentastar. When my 2013 needed a completely new head at its first oil change it didn't throw any codes either. Getting 50 plus misfires on cylinders 3 and 5 and much lower numbers on the rest.
I had hoped 10 years of development may have made a better product.

If it's spark plugs causing the misfires, warranty doesn't cover it; they're wear & tear items. Coil packs are covered.

Since you have to remove the coil packs to put new plugs in, 2 birds, one stone. However, yes, you don't know which one solved the problem (if it gets solved).

What I suggested you do with your JT - go drive it and get it to go above 5,000 RPMs and see if it induces misfires - is the diagnostic that is the most important one for this f**king engine.

If the misfires start tallying up in the hundreds, it means your valvetrain is taking a s**t and since you have a warranty, Jeep will take care of it. Then you can take it the dealership with an explicit scenario to replicate.

I can go drive around right now with my JT for a couple hours and I'll have a couple dozen misfires. This is SOP in modern engines. This is known. You can search Ford forums, Volkswagen forums, Hyundai forums, etc. You find the same complaints about misfires and people freaking out over them because they have a device that counts every misfire.

Jeep already issued a TSB on earlier JTs because of an incorrect misfire logic calculation would trigger the CEL. Jeep knows and acknowledges misfires occur in the engines. The TSB fix was to raise the threshold before the light was triggered. They didn't eliminate misfires because it's f**king impossible to do in today's engines.

 

[ShadowsPapa]

The 3.6L engine has been eating cams and having misfire issues long before covid, and before it became the PUG. The fact that is is still a issue in 2026 says a lot.

Sorry, not true in that the issues were DIFFERENT parts and DIFFERENT causes. You cannot say a pre-upgrade engine has the SAME issues as the PUG - it does not.
The gen 1 engine was due to ROLLERS giving out.
The gen II or upgrade engine is due to the high lift part of the follower eating the cam lobe - or the cam lobe eating into the follower.
So they aren't the same. It's not "still an issue". Only the PUG engine has the cam and high lift follower issue - you have some bad internet info there

 

[ShadowsPapa]

I have not read every post in this thread - but this comment here caught my attention -

Does the misfire happen only when the engine is warmed up, and only after a restart - either immediately after or maybe 4 or 5 minutes after restarting a warm engine?

Have they bothered checking the CCDIFF values?

If it's spark plugs causing the misfires, warranty doesn't cover it; they're wear & tear items. Coil packs are covered

Depends on the year - there's a TSB for an obscure spark plug issue and we dealt with it in our 2021 WK2 but I'd expect anything AFTER that to be resolved.
That thing kicked like a bronc with a burr under the saddle - but only sometimes.
Luckily I had grabbed a freeze frame using AlfaOBD and it flagged it as ignition misfire along with several pages of other info.

 

[23black]

You could have a very minor issue on your hands, but I understand the frustration.

I'm not sure what anyone else can tell you other than keep trying new dealers, or move on from Jeep. The only other thing is to dig in yourself, which sounds like you aren't interested in. Again, I get it.

They're just vehicles. If you can stomach the money just wash your hands of it and roll along.

I used to get rid of them (vehicles) every few years for a reason.

Yup. Let'r go.

The 3.6 isn’t a perfect engine but if the issue you are experiencing was related to the design we’d be seeing more of it with millions of these things running around. I’d find another dealer or independent mechanic to take a look.

How are you under warranty btw at 66k? If you bought the extended warranty, well that’s your first mistake.

I bought the extended warranty based on my previous 2013 3.6 Pentastar. Even with it, this thing isn't worth the bucking, the harsh and shuddering acceleration. The sloppy geat searching. The noticeable misfires.
Put Jeep 3.6 misfire in any search engine and it shows exactly what I am talking about.
It's not character, it's a poorly running engine.

 

[23black]

I have not read every post in this thread - but this comment here caught my attention -

Does the misfire happen only when the engine is warmed up, and only after a restart - either immediately after or maybe 4 or 5 minutes after restarting a warm engine?

Have they bothered checking the CCDIFF values?

Totally made up. I told them it just needs to come up to running temp. The same mechanic claimed he test drove it four times on the previous visit. For a total of 4 miles. Hot, cold, at highway speeds....... He did that all, in four miles?
Until a MIL comes on they can't go any further. Even the service manager says it runs like crap.

 

[23black]

I have not read every post in this thread - but this comment here caught my attention -

Does the misfire happen only when the engine is warmed up, and only after a restart - either immediately after or maybe 4 or 5 minutes after restarting a warm engine?

Have they bothered checking the CCDIFF values?



Depends on the year - there's a TSB for an obscure spark plug issue and we dealt with it in our 2021 WK2 but I'd expect anything AFTER that to be resolved.
That thing kicked like a bronc with a burr under the saddle - but only sometimes.
Luckily I had grabbed a freeze frame using AlfaOBD and it flagged it as ignition misfire along with several pages of other info.

These are black box technicians. Without a MIL telling them exactly what to replace they would not even look. Parts changers at best. Not mechanics.

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