New Jlu 6 speed low rpm stumble

[Headbarcode]

It's a simple matter of keeping the rpm's up. The 3.6 is a higher rpm tuned motor. That makes it kinda gutless at low rpm's. A lugging load will cause misfires, popping, drivetrain rattles, and other unwanted results of forcing the engine to work below its effective working range.

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[401nate]

Just a quick update, put on just under the 300mi mark and it has seemed to get a bit better. Just adjusted my shift pattern a bit to help. Pretty much wont shift until 3000 or 3200 for every shift.

 

[ChattVol]

Just a quick update, put on just under the 300mi mark and it has seemed to get a bit better. Just adjusted my shift pattern a bit to help. Pretty much wont shift until 3000 or 3200 for every shift.

Rev it a little higher before shifting out of 1st, 2nd, 3rd. I shift at 3400-3500rpm...drives better.

 

[Goosed]

I’m about 3k rpm in 1st and 2nd. Higher in second if hitting a hill from a stop. 3rd sucks in the wrangler. Have a rubicon with the 4:10 so a little different than the 3:45.

 

[Toycrusher]

Rev it a little higher before shifting out of 1st, 2nd, 3rd. I shift at 3400-3500rpm...drives better.

The hard part is ignoring engine noise. It just doesn't sound nice till you clear 5000 rpm. That 2000-4000 is particularly painful to listen to. High radio volume to the rescue!

 

[ChattVol]

The hard part is ignoring engine noise. It just doesn't sound nice till you clear 5000 rpm. That 2000-4000 is particularly painful to listen to. High radio volume to the rescue!

It revs more lively with the OEM clutch.

 

[401nate]

I’m about 3k rpm in 1st and 2nd. Higher in second if hitting a hill from a stop. 3rd sucks in the wrangler. Have a rubicon with the 4:10 so a little different than the 3:45.

1st into 2nd is usually fine but yes if I am on a hill I have been bringing 2nd up to 3500 before going to 3rd. My Jeep has less than 300miles... manual says to avoid going over 4000rpm until the first oil change after 500mi

 

[401nate]

Pricing out a 3.5” lift with 35’s. Definitely need to regear

 

[Chris.steger]

Hi folks, just picked up a new Jlu sport with a 6 speed a couple days ago. I am noticing an issue already though which is a bummer. Primarily in 3rd gear I am getting what feels like a slight misfire or stumble if the rpms are below 2000rpm. For instance slowly accelerating up to 30mph once I shift out of second and into third (clutch out) I will feel a bit of this. In order to keep the Jeep happy I have to shift out of 2nd at about 3200rpm in order to be at 2000rpm in 3rd and avoid this stumble. This poses problem #2 where trying to hold 30mph in a 25mph zone I Am in 3rd gear at 1600rpm... enters this stumble upon light acceleration.

Anyone else experiencing this with their manual jl? Aside from this annoyance I love it so far.

I have a 2020 3.6L Manual and have the same issues with mine..

Thank you for posting this.. I will be interested to see what everyone says..

 

[Cutterone]

Same here, 2018 Sahara 6sp, only seems to occur in 3rd below 2k rpms, I just usually leave in 2nd or at times in 3rd but be super light on the throttle...

 

[jeepthang]

Same here, 2018 Sahara 6sp, only seems to occur in 3rd below 2k rpms, I just usually leave in 2nd or at times in 3rd but be super light on the throttle...

It's a tuning issue no doubt. There's been quite a few posts on this already. High octane fuel seems to help a bit..

 

[Cutterone]

It's a tuning issue no doubt. There's been quite a few posts on this already. High octane fuel seems to help a bit..

I'lll give 93 fuel a go for shits and giggles

 

[401nate]

Yeah I have been learning to ride out the gears a bit longer and she is definitely happier. I will be trying either 93 or 89 next tank. First tank through her and I averaged 22mpg!! Hand calculated!

 

[jcr97703]

2020 Rubicon with 6 speed and mine stumbles too In 3rd. A little better with premium gas. I agree gear ratios are way to tall in 3rd and above. Almost never use 6th. And as a mostly town driver, I go between 2nd and 3rd way too often. Definitely needs a shorter 3rd gear.

 

[401nate]

2020 Rubicon with 6 speed and mine stumbles too In 3rd. A little better with premium gas. I agree gear ratios are way to tall in 3rd and above. Almost never use 6th. And as a mostly town driver, I go between 2nd and 3rd way too often. Definitely needs a shorter 3rd gear.

Still running this tank out as I primarily use the Jeep as a weekend vehicle but will also be trying premium. And I agree. I shift out of 4th at 3000rpm doing about 80mph. I use 6th for flat or downhill sections of hwy cruising at 80-85mph and my rpms are barely over 2k. I love having a manual Jeep, but am a little disappointed at the ratios in the trans.

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