Rough Idle

[snelldogg]

I have a 2018 6MT Sahara with approx 6k miles on it. Since day one i have felt like its idled rough. Doesn't sputter or spike just a constant heavy vibration. So much so that you can physically see the plastic windows of the soft top moving. On routine maintenance i have mentioned this, i am told no misfire..."they are all like this". I say it's BS.

Any thoughts or folks experiencing the same?

TIA

Sponsored

 

[Kevman]

I have the same thing. Figured there wasn't much I could do about it though. Maybe bad engine mounts?

 

[Badger98]

I have this also with my Rubicon. I have had it for a month with less than 1,000 miles on it. I was hoping it was just going to get better. I am thinking about taking it in. Have you tried doing anything to fix the issue yet?

 

[snelldogg]

I have this also with my Rubicon. I have had it for a month with less than 1,000 miles on it. I was hoping it was just going to get better. I am thinking about taking it in. Have you tried doing anything to fix the issue yet?

Dealership didn't help. Learning to live with it. Have 6k miles now.

 

[Seanmh72]

I agree with this as well. Unfortunately, the dealers are going to say that there "are no codes" so there won't be anything for them to fix.

This isn't the olden days that you could manually adjust things. CPU does it all now.

 

[Reaperdodad]

I also have a Sahara 6MT with the exact same issue. I thought at first maybe it was just breaking in but at nearly a thousands miles it's the same. Really irritating as we can feel the vibrations in the seat and imo should be smooth. Wonder if its software related

 

[Litfuse]

I have it as well. My two previous JKs with the 3.6 did not do this. I contribute either to motor mounts or a low idle that could be corrected in the tune to be turned up 50-100rpms.

 

[jeremyjeep]

Check out the "rough idle" wording in TSB 18-041-18 Rev B — Flash: Powertrain and System Improvements (PCM Reprogram) . Does this describe your idling? Even if it is close, might be worth a try. My rough idling didn't seem too bad, but after the update, it is super smooth now.

https://www.jlwranglerforums.com/fo...reprogram-september-7-2018.15739/#post-422669

 

[Reaperdodad]

Thank you so much for the info! You rock brother

 

[jeremyjeep]

Thank you so much for the info! You rock brother

Let us all know if that fixes it. It is good to have double, triple, etc. confirmation on a fix.

 

[ibrahim_86]

Have any one managed to fix this issue !!!

 

[jeremyjeep]

Have any one managed to fix this issue !!!

Yes, a few have with TSB 18-041-18 Rev B — Flash: Powertrain and System Improvements (PCM Reprogram). So far no one said it didn't fix their rough idling, but there is always a first.

https://www.jlwranglerforums.com/fo...reprogram-september-7-2018.15739/#post-422669

 

[supermike]

18 jlur I can see the fender shakes. I know the 3.6 it’s not know for smooth, but mine is shakier than my friend’s jk and also my old JK. I don’t even bother to go to dealer, they will say no codes no worries.

 

[jeremyjeep]

18 jlur I can see the fender shakes. I know the 3.6 it’s not know for smooth, but mine is shakier than my friend’s jk and also my old JK. I don’t even bother to go to dealer, they will say no codes no worries.

Make an appointment for the loud fan fix TSB ( TSB 18-041-18 Rev B — Flash: Powertrain and System Improvements - PCM Reprogram.) It also fixes rough idling per the items listed in the TSB. If they refuse, either call another dealership or send a private message to @JeepCares and ask them to assist. They will contact the dealership for the appointment.

 

[snelldogg]

18 jlur I can see the fender shakes. I know the 3.6 it’s not know for smooth, but mine is shakier than my friend’s jk and also my old JK. I don’t even bother to go to dealer, they will say no codes no worries.

Same for me. Its in again and they say its perfect....annoying!

Sponsored