Originally Posted by Uneasy Rider

At just 700 miles on the odo I would not be cleaning anything yet.

Try a different brand of fuel before you do anything.

Originally Posted by H2OBoy

So my '11 JKU has right at 700 miles and from day one has had a bit of a rough idle. It is worse right as and shortly after the vehicle is started. I took it into the dealer to have it checked and they cannot find anything. There are no faults showing and everything checks out on their end. They tell me they really can't do anything until the computer shows an error code or there is a technical service bulletin showing an issue. Any ideas where to go from here? I would imagine the idle is not going to get any smoother on it's own as time goes on.

Originally Posted by karls10jk

I had a rough idle and it turned out to be a cracked spark plug. I noted the idle at 1 mile when I bought it. My salesman said "all of them do that because chrysler doesn't run these motors prior to you taking delivery, don't worry about it, it is nothing". The code for a bad plug popped at 500 miles and my servicewriter (dickhead we shall call him) told me that when I washed the exterior of my jeep that I must have gotten some water on the plug and I needed to be more careful (jeep hadn't been washed in 3 days and the temperature was 80 outside, normal operating temps under the hood so water would have dried). So they reset the code and sent me on my way. I took it home and checked the plug in question- the insulation was broken causing it to short to ground. The issue popped another code at 1000 miles and this time they took an hour and a half to figure out it was a bad plug. First they said it was my computer, then my coil pack, then maybe wires and then they finally came out to me with a plug in hand.



Edit- at 1000 miles I cleaned my TB because I was bored. I just did it again at 20k miles just to prevent any potential issues down the road (cough cough TOYOTA cough cough) my auto mechanic friend said they should be cleaned at 50k but 30k is better. Less gunk is more power.

Originally Posted by karls10jk

I had a rough idle and it turned out to be a cracked spark plug. I noted the idle at 1 mile when I bought it. My salesman said "all of them do that because chrysler doesn't run these motors prior to you taking delivery, don't worry about it, it is nothing". The code for a bad plug popped at 500 miles and my servicewriter (dickhead we shall call him) told me that when I washed the exterior of my jeep that I must have gotten some water on the plug and I needed to be more careful (jeep hadn't been washed in 3 days and the temperature was 80 outside, normal operating temps under the hood so water would have dried). So they reset the code and sent me on my way. I took it home and checked the plug in question- the insulation was broken causing it to short to ground. The issue popped another code at 1000 miles and this time they took an hour and a half to figure out it was a bad plug. First they said it was my computer, then my coil pack, then maybe wires and then they finally came out to me with a plug in hand.



Edit- at 1000 miles I cleaned my TB because I was bored. I just did it again at 20k miles just to prevent any potential issues down the road (cough cough TOYOTA cough cough) my auto mechanic friend said they should be cleaned at 50k but 30k is better. Less gunk is more power.

Originally Posted by turn 9

I just had my oil changed at 15,000 kms (9,000 miles) on my 2011. It also has a bit of a rough idle and feels a bit sluggish. The service tech took it for a drive to check a possible bad ball joint and he noticed it without me telling him. They did not check into it, but he told me to check the plugs and chances are that I will find a bad one. I'll pull them this weekend and if there's a dud I'll post some pics.