3.6L "Hiccup"

[OldGuyNewJeep]

Mine is doing this too I think. For the past few days I give it gas and it feels like it is hesitating. Almost like when you are in too high gear and you go slow how it bucks.
but very very-slightly
Does this mean my clutch is slipping???.

The way the techs test clutch (seems harsh, but it’s fine):

https://www.jlwranglerforums.com/forum/attachments/w12-recall-pdf.316272/

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[Moosebear]

I've always got to highway speeds at a high RPM and then floored it. If the clutch is slipping your engine RPMs will jump up without an equivalent increase in speed.

 

[wsly14]

Mine has the hiccup as well. Mine is a manual, and it’s only ever happened to me in third gear under light load around 3k rpm. I haven’t played with it enough to see if it can be consistently recreated. I don’t often drive in such a way that makes it hiccup, so it doesn’t cause me too much annoyance. Doesn’t seem like a clutch issue, as I can feel the engine rpm’s unexpectedly drop when it “hiccups”

 

[Ironhorse]

Hey All its been a long time...

I'll give a quick update.

It's now 10 months I've had my 2021 JLUR and 10k miles and I still have the hiccup. I tried using the Tazer to fully turn off traction control and it did not help.

I suspect, as someone mentioned way early on that this is a VVT thing.

I have since done the exhaust delete and it seems to have drawn attention to the hiccup (louder) but no harm.

I'm just used to it now.

However the rough idle I mentioned in the original post has gone away. I think it was after I changed the oil...

For future onlookers, don't worry about it, it's not going to hurt anything, just consider it one of the quirks that makes our Jeeps unique.

If you really hate it, I suspect a tune would resolve it but void your warranty.

[Jeep Wave]

Wow!! This seems to be a systemic problem with them. Just bought a brand new JLU 3.6 manual and it is doing same exact thing. I took it back and took service for a test drive. They are now opening a case with FCA for troubleshooting. Take it in !! More complaints equal action on FCA part!

 

[Ironhorse]

Good morning everyone,

I heard your concerns and sincerely apologize for any inconvenience this has caused you thus far. The best course of action would be to schedule an appointment with a nearby Jeep dealer to get your concerns properly diagnosed. If you'd like additional support while your vehicle is being serviced, please don't hesitate to reach out to our JeepCares team via private messaging with any questions or concerns. Thanks-- have an awesome day!

Courtney
Jeep Cares

Hello, just bought a brand new 2024 Jeep Rubicon 3.6 manual trans and it is doing exactly what this post states. Brought it back to dealer they test drove it with me, experienced problem, but initially said with no codes there isnt much they can do. I have pushed the issue and am brining back next week and they said they will open a case with Jeep. Any help would be appreciated?. Thank you. Keene Chrysler Jeep Dodge in Keene NH

 

[Truckn]

Hello, just bought a brand new 2024 Jeep Rubicon 3.6 manual trans and it is doing exactly what this post states. Brought it back to dealer they test drove it with me, experienced problem, but initially said with no codes there isnt much they can do. I have pushed the issue and am brining back next week and they said they will open a case with Jeep. Any help would be appreciated?. Thank you. Keene Chrysler Jeep Dodge in Keene NH

Congratulations on the new Rubicon!
Great choice on the manual transmission.

I'm 20k miles later, I still love mine
As for the "hiccup", it's still there.

I notice it every time, but it no longer bothers me.


if you're like me and worried that it may amount to some problem down the road, I'm at 22k miles and not a single issue...

Please do let us know what comes of the case, I'd appreciate it.

 

[Ironhorse]

Congratulations on the new Rubicon!
Great choice on the manual transmission.

I'm 20k miles later, I still love mine
As for the "hiccup", it's still there.

I notice it every time, but it no longer bothers me.


if you're like me and worried that it may amount to some problem down the road, I'm at 22k miles and not a single issue...

Please do let us know what comes of the case, I'd appreciate it.

Will do! Have “Jeep Cares” involved as well. Hopefully they get to the bottom of it, even if it is a software update? Not sure if it is effecting all 3.6 manuals???

 

[Truckn]

Will do! Have “Jeep Cares” involved as well. Hopefully they get to the bottom of it, even if it is a software update? Not sure if it is effecting all 3.6 manuals???

If I had to take a wild guess, I'd say it's probably something in the MAF sensor or fuel-mapping.
Either way, it's likely a software fix.

If it is a software fix, I am not interested.

 

[Melchior]

I have ‘24 manual and notice this “hiccup” too at 3k rpm. Not quite as consistent and doesn’t seem like a big deal, but it can be a little jarring when it happens. I too think it’s an ecu/emissions thing

 

[LatteSipper]

I think it’s something normal about the engine operation and just felt through the driveline. I had a VW VR6 and recall there was a flap in the intake manifold runner that would switch at 3200 rpm. I’m not saying that’s what this is, but that the engine may be switching something at that rpm range causing a momentary hiccup that is normal.

In my JL, the in town driving speed is typically around 3k rpm, and as I’d coast then get on the throttle in that rpm band the hiccup frequently occurred. Once I installed an after market clutch and heavier flywheel it stopped. I believe the higher mass flywheel smooths out the hiccup felt in the driveline.

My $0.02.

 

[Captain Morgan]

Hi all, I am new to Jeep and bought a 2024 Sport 3.6 6mt. 230 miles on the odo right now and it’s done this from day 1. At first it got my attention but then reading up on the Pentastar engine, it seems they updated the VVT at some point through it’s production. In my personal opinion, I have a feeling that it’s just the VVT operation and it’s operating crudly. I’ve driven a lot of Toyota 3.5 2GR-FE motors and although not the same, you can feel a large increase in power around 3k RPM’s. I suspect a lot of manufacturers have the tuning down to a science and most formulate 3k-4k RPM is where there is a crossover of HP/TQ. I’m betting that the VVT is waking up at 3k and causing a stumble due to low demand. If you cruise the engine around 3k or utilize light load, you experience stumble. Try and accelerate through 3k up to 4k with load on the engine and then shift. See if that produces a smoother engine run. I’m going to test my theory tomorrow.

 

[Ironhorse]

Hi all, I am new to Jeep and bought a 2024 Sport 3.6 6mt. 230 miles on the odo right now and it’s done this from day 1. At first it got my attention but then reading up on the Pentastar engine, it seems they updated the VVT at some point through it’s production. In my personal opinion, I have a feeling that it’s just the VVT operation and it’s operating crudly. I’ve driven a lot of Toyota 3.5 2GR-FE motors and although not the same, you can feel a large increase in power around 3k RPM’s. I suspect a lot of manufacturers have the tuning down to a science and most formulate 3k-4k RPM is where there is a crossover of HP/TQ. I’m betting that the VVT is waking up at 3k and causing a stumble due to low demand. If you cruise the engine around 3k or utilize light load, you experience stumble. Try and accelerate through 3k up to 4k with load on the engine and then shift. See if that produces a smoother engine run. I’m going to test my theory tomorrow.

I agree, and we need to hold FCA accountable for a software/tune update if that is the case. I started a case with “Jeep Cares” and it is going in Tuesday to dealer for correction. If not, they can hold it while I drive their loaner. Take it in and complain, otherwise it will never get fixed. 60+ thousand dollars should not have to deal with crappy tunes from stock

 

[RAD1]

Let us know what you hear back from the dealer @Ironhorse.

 

[Bonino]

I thought I’d share my experience with this issue - I bought a 3.6l auto in 2023 and, since new, I’ve been experiencing the hiccups and lack of linear progression at low RPM. After reading this post, I’ve decided to drive the car without turning the ESS off and, surprise surprise, the car now performs as expected all the time I initially thought that low octane fuel could be the root cause, so I started filling up with 95 and 98 RON. I might go back to using 91 RON now and see what happens

 

[DanW]

I thought I’d share my experience with this issue - I bought a 3.6l auto in 2023 and, since new, I’ve been experiencing the hiccups and lack of linear progression at low RPM. After reading this post, I’ve decided to drive the car without turning the ESS off and, surprise surprise, the car now performs as expected all the time I initially thought that low octane fuel could be the root cause, so I started filling up with 95 and 98 RON. I might go back to using 91 RON now and see what happens

Is yours an E-Torque?

I've got a 2018 JL and 2021 JT both 3.6's and I never use ESS and have never seen any issues. Just curious if maybe the E-Torque is at play with this

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