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Old 12-04-2015, 07:21 AM
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2016 JK - Weird Idle at lower speeds

Hey guys,

First off:
2016 Willys 2 Dr Wrangler
Manual 6 Spd.

So I was driving to work this morning and something weird was going on with my Jeep.

It had a very rough idle (I could feel some stronger vibes, almost like something was off balanced).....and it seemed that I had a loss of power as I shifted through the first couple gears. As in.....as I shifted into say 2nd, it was almost as if I was "letting it die" and then slamming the gas down and waiting for it to pick up. It did this any time I came to a stop/was slow enough to use like the first 4 gears.

Also.....when I did get to lower speeds/stopping, the check engine light would come on and would blink, but then that went away when I got to highway speeds.

Any thoughts or ideas. I got to work and didn't have time to mess with anything, so I will have to see if it is still doing it on the way home and then possibly take it to the dealership, but I just wanted to see if any of you had experienced this.

Thanks,
BD

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Old 12-04-2015, 07:28 AM   #2
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blinking CEL is bad...I would get it towed to the dealer ASAP.

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Old 12-04-2015, 07:30 AM   #3
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Did you recently fill up? Possibly a tank of bad fuel.
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Old 12-04-2015, 07:40 AM
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Filled up a few days ago......no problems until just this morning and it has been driven probably 150-200 miles since fill up.

As for the CEL......what does a blinking CEL mean? Like I said, it only blinked when I would come to a stop, and then it would blink for a few......and then I got back up to speed and it was gone.
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Old 12-04-2015, 10:00 AM   #5
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https://www.google.ca/search?q=what+...m=122&ie=UTF-8

Quote:
A blinking light usually indicates a severe engine misfire allowing unburned fuel to be dumped into the exhaust system. There it can quickly raise the temperature of the catalytic converter to a point where damage is likely, requiring an expensive repair.
Check Engine Light -
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Old 12-04-2015, 10:10 AM   #6
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Originally Posted by nighowl2000 View Post
That's very close to accurate.

A flashing CEL means there is a constant misfire. It could result in unburnt fuel if the misfire is caused 100% by failure of the ignition, but if the misfire is due to low compression, poor fuel (bad injector, fuel pump, fuel line), then it won't necessarily kill the cat. And furthermore, if the misfire is caused by a failing/clogged/unplugged/etc. fuel injector then the lean condition can cause far worse damage like burned valves.

BTW a hard failure of the ignition such as a bad coil or something causing constant failure of spark in 1+ cylinders will ruin the catalytic converter in just a matter of seconds if you keep driving. So flashing CEL is reason to immediately shut down the engine. Of course your Jeep is under warranty so that just means they'll replace the cat(s) along with whatever else was wrong. Usually they fix the root cause problem and then the failed catalyst code comes up a week later and you have to take it back for them to do the cats.

Given the rash of cracked left cylinder heads in pentastar Wranglers causing a misfire, I'd say that's the top of the list of misfire causes. However, your description sounds a lot more like an ignition problem to me.
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Old 12-05-2015, 12:12 PM
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Thanks guys. After reading everything about the flashing check engine light and talking to the dealership.....I decided to get it towed from work.

Its at the dealership now since I have less than 2000 miles on it. We'll see what they say.
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Old 12-05-2015, 01:23 PM   #8
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I have a standard transmission and my '13's engine feels wobbly when I get a tank full of bad gas. It's only happened a handful of times but never had the CEL come on. Definitely has lack of power especially in 1st and 2nd. Usually goes away after filling up with new gas. It seems to be sensitive to fuel quality.
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Old 12-05-2015, 02:36 PM   #9
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Just drive my 'new' '15 rubi home and I love it! 6sp MT brings me back to my high school years. Question: they suggest regular 87 octane which is fine with me as my MDX requires the $$ stuff. Would higher octane improve anything besides the oil company's bottom line?
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Old 12-08-2015, 09:15 AM   #10
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Quote:
Originally Posted by Raffy1 View Post
Just drive my 'new' '15 rubi home and I love it! 6sp MT brings me back to my high school years. Question: they suggest regular 87 octane which is fine with me as my MDX requires the $$ stuff. Would higher octane improve anything besides the oil company's bottom line?
No....
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Old 12-09-2015, 07:01 AM
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So....to keep you guys updated.....sounds like when it got to the dealership, the code was a stored code.

P0172 - Fuel System Rich was the stored code.

Tech can't get it to re-occur (as usual at the dealership) and so they have kept it for a few days trying to figure out what to do. Sounds like I will be getting it back today, and that the tech really didn't do anything to it.

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