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hi all! haven't been on in a while, no issues with the Jeep until last week.
out of nowhere it started doing this weird thing when I'm stopped at a light or in traffic idling. (it doesn't do it every time, but almost every time depending on how long im stopped for) I feel a shake or hesitation or shudder similar to the feeling you get when it's going to stall, only not to that extreme. I'm not worried it's going to stall, but it's definitley not right. the engine doesn't make any noises when it does this and the engine otherwise is running totally fine, doesn't sound different. No check engine light and the gauges aren't fluctuating or anything when it does this.

worried it may have something to do withe cylinder misfires....:(
it's a V6
taking it to jeep this week
 

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My '11 had gotten a tad bit of a rough idle. I had to make about a 1000 mile round trip week before last so on the return trip I filled up with 89 octane NO Ethanol. The idle seems to have cleared up.

Just for info, I was getting 22 mpg running 87 octane 10% Ethanol on the tank going and I got 24 mpg running the 89 octane NO Ethanol on the return trip. Speeds around 75 both ways all interstate.
 

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Key to listen for is a buzzing or humming from under the car once you have turned it off.


For all of your ideling problems just remember the word TIPM. It starts with the ideal and ends with you not being able to crank the car. It is actually your fuel pump shorting out. There's a lot of threats on that and jeep is issued a recall for that computer system. Jeep will not touch your car when he comes to recall until it just stops running altogether. In my case my wife was driving and it died on the interstate at 70 miles an hour. That was before the recall and I got rid of the car due to the $1200 price tag and no guarantee of it being fixed due to them not upgrading the system even though they know it has an issue.
 

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Me too. Mechanic I trust suggested swapping aftermarket non-oiled intake back to the stock airbox with new filter and then he'd do a TB cleaning. Said the spark plugs are totally fine and wouldn't do anything, I guess he was right based on what I just read here. But seems like the TB cleaning didn't help folks here either.


Thinking some more now on my own, I wonder if its just age and the engine mounts starting to wear out. I hope it's not what the first poster on the page said about the TIPM and fuel pump short, cuz I do I hear a buzzing/humming sound once in a while from the car when it's off. It's always done that though...
 

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hi all! haven't been on in a while, no issues with the Jeep until last week.
out of nowhere it started doing this weird thing when I'm stopped at a light or in traffic idling. (it doesn't do it every time, but almost every time depending on how long im stopped for) I feel a shake or hesitation or shudder similar to the feeling you get when it's going to stall, only not to that extreme. I'm not worried it's going to stall, but it's definitley not right. the engine doesn't make any noises when it does this and the engine otherwise is running totally fine, doesn't sound different. No check engine light and the gauges aren't fluctuating or anything when it does this.

worried it may have something to do withe cylinder misfires....:(
it's a V6
taking it to jeep this week
I had the same issue for my 16' limited 3.6L. It only has 22000mi. Come on FCA,,,,,

It happens at the traffic light, mostly at first cold start first traffic light after overnight parking.

Try to duplicate your symptom in the morning when your car is cold see if you get the same issue. Mine happens around 30' second after a full stop.

I am also doing 89/91 gas experiment as I hear light knocking sound with 87. I have been running 91 for over the weekend and looks like the knocking sound is gone.

:(
 

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Thinking some more now on my own, I wonder if its just age and the engine mounts starting to wear out.
I’ll almost guarantee it’s the engine support mounts. Mine went “south” at about 80k miles on my ‘11 Laredo X. Started noticing shaking and studdering especially at idle almost like the engine was about to die... but RPM’s were always steady and smooth. I finally realized it was the engine mounts when the driver side mount started leaking hydraulic fluid on the driveway several weeks after the symptoms started.

It’s a $700 fix at the dealer. I ended up buying two Mopar OEM mounts on Ebay for $110 shipped and paid a Craigslist mechanic $90 to install them. The thing has run smooth as silk since.
 

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I’ll almost guarantee it’s the engine support mounts. Mine went “south” at about 80k miles on my ‘11 Laredo X. Started noticing shaking and studdering especially at idle almost like the engine was about to die... but RPM’s were always steady and smooth. I finally realized it was the engine mounts when the driver side mount started leaking hydraulic fluid on the driveway several weeks after the symptoms started.

It’s a $700 fix at the dealer. I ended up buying two Mopar OEM mounts on Ebay for $110 shipped and paid a Craigslist mechanic $90 to install them. The thing has run smooth as silk since.
Thats great news. Did you watch the install? Did it seem difficult?
 

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Thats great news. Did you watch the install? Did it seem difficult?
I was on site the whole time. A head mechanic and one of his employees from a large local trucking company did the work “after hours” at his home. Took four hours. They clearly knew what needed done and did a fabulous job... but really “struggled” especially getting the old ones out. LOTS of stuff in the way to deal with.

I have to admit... quoting $90 labor was WAY too cheap for that job. At least $200 would have been much more realistic. They clearly realized that by the time they were done.
 

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hi all! haven't been on in a while, no issues with the Jeep until last week.
out of nowhere it started doing this weird thing when I'm stopped at a light or in traffic idling. (it doesn't do it every time, but almost every time depending on how long im stopped for) I feel a shake or hesitation or shudder similar to the feeling you get when it's going to stall, only not to that extreme. I'm not worried it's going to stall, but it's definitley not right. the engine doesn't make any noises when it does this and the engine otherwise is running totally fine, doesn't sound different. No check engine light and the gauges aren't fluctuating or anything when it does this.

worried it may have something to do withe cylinder misfires....:(
it's a V6
taking it to jeep this week
Did you get it resolved? I have same issue, in drive idle is about 600rpm, go to neutral or park and idle rpm goes up and it goes away.
 
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