2016 JKUR, 18,600 miles - very rough idle - Jeep Wrangler Forum
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Old 07-09-2018, 09:32 PM
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2016 JKUR, 18,600 miles - very rough idle

Friday I went out with a buddy and got into some pretty thick mud. Nothing real deep, although there was one puddle that probably had mud up to the axles and water up to the rock rails. When we were done, we pulled over to the let the kids run around for awhile and when I parked, I felt the Jeep idling VERY rough. When I shut it down and removed the key, it continued...kinda like it was 'diesling'. I asked my friend if he heard it, he said no, I restarted the Jeep and everything seemed fine.

Finally drove home, drove some Saturday, washed it Saturday night, and it sat all day Sunday. Drove to work this morning with no noticeable differnce than the first 18,500 miles.

But when I came home, I heard/felt it idling rough. Same thing happened when I got home and turned it off albeit not as bad. It sounded like the fan kept running for a few seconds...and running rough. Any chance there is just mud caked on something, throwing the balance off?

No other 'symptoms' that I can tell.

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Old 07-09-2018, 09:35 PM   #2
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clean your radiator and make sure the serpentine belt is ok. The fan is electric so that should not be effected but it will run until it cools down. Mud sucks

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Old 07-10-2018, 08:38 AM   #3
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@Old Dogger @jadmt move thread?
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Old 07-10-2018, 08:40 AM
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clean your radiator and make sure the serpentine belt is ok. The fan is electric so that should not be effected but it will run until it cools down. Mud sucks
Any suggestions on cleaning radiator? Am I good using water hose to clean the mud out of the engine bay?
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Old 07-10-2018, 08:41 AM
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@Old Dogger @jadmt move thread?


Oops...didn't realize I put this in the JL forum.
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Old 07-10-2018, 10:46 AM   #6
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Old 07-10-2018, 11:45 AM   #7
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Oops...didn't realize I put this in the JL forum.
No worries, it happens all the time!
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Old 07-11-2018, 01:57 PM
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Didn't drive yesterday at all, but drove this morning and at lunch today. No issues this morning. No issues running a few errands.

'Issues' started at lunch...when I turned the AC on. I turned the AC off and on a few times, and it got noticeably worse with the AC on...and when I shut the Jeep off with the AC on...the fan and vibrations continued for about 3 seconds after.

No other issues with the AC...cooling, squeaking, nothing...
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Old 08-13-2018, 09:27 AM
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Okay...this is driving me crazy. Taken to dealership twice. First time they said, 'nothing wrong, but we did a software update on the PCM which could possibly been having a cylinder timing mis-fire'. No change. Second time, 'nothing wrong'.

Current symptoms...NO more 'diesling' after shutting motor off, but still getting some awkward vibrations. Wife even finally started noticing it. She said it sounds like some weird pressure change (like when you have one back window open and nothing else). It sounds...at speed and sitting in park...like there is a constant low bass sound coming from a sub (i don't have a sub) and nothing else. You can here it from outside the vehicle too.
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Old 08-14-2018, 08:59 AM   #10
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I have a 2016 JKR. The A/C changes the relatively quite and smooth-running motor into a growling, twitchy, vibrating, rumbly beast. I had the dealership "check" it after our first summer of use, and they said it's "normal." The A/C seems to work fine, though I'm not a fan of it cycling on/off all the time. But idling at a stoplight with the A/C on, I feel like it's going to sputter and kill half the time.
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Old 08-14-2018, 12:31 PM
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Is it possible I have an exhaust problem/leak?

My wife and I, master mechanics the both of us, looked/listened last night and the exhaust 'tone' is obvious when the car is vibrating.
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Old 08-14-2018, 12:35 PM   #12
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There are number of sensors that don't like mud. Have you done a thorough wash including the under carriage?
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Old 08-14-2018, 01:04 PM   #13
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Is it possible I have an exhaust problem/leak?

My wife and I, master mechanics the both of us, looked/listened last night and the exhaust 'tone' is obvious when the car is vibrating.
absolutely. when the exhaust gets mashed up against the skid plates or frame it for sure will cause some harmonic vibrations. maybe mud is packed in between the exhaust and frame/skids etc.

I am a bit surprised that a master mechanics would not know how to clean a radiator. Not knocking you just curious.
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Old 08-14-2018, 03:11 PM
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absolutely. when the exhaust gets mashed up against the skid plates or frame it for sure will cause some harmonic vibrations. maybe mud is packed in between the exhaust and frame/skids etc.

I am a bit surprised that a master mechanics would not know how to clean a radiator. Not knocking you just curious.
Ha...I was being facetious on the master mechanic part. My wife can change a tire and put gas in a car. I can change fluids, fuses, batteries, filters, take things apart, and sometimes even put them back together correctly.

I've cleaned everything I can clean...I may have to get up under there and clean some more. I'm going to check out the exhaust system in the next couple of days when I have some time off of work.
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