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  #1  
Old 06-22-2015, 11:27 AM
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Lean misfire MIL code

2014 Feb build, started right at 20k miles.

Don't remember the code number, but had the MIL light come on after a big rainstorm, it went off within 24 hours.

I thought I was having really bad fishbite, (like driving on a washboard gravel road) as I would get a severe shudder when it was trying to change gears at low rpm, but then I started to get a very rough idle as well poor gas milage so I took it in for updates and a look over. I guess my dealer had another wk2 with similar issues and already had a star case open, and the lean misfire is caused by a valve intermittently sticking due to the design of the cylinder heads. My service adviser said there is going to be a TSB coming out for this, but Jeep is waiting to get all of the parts available before its release.

So the fix; replace the head with a re-designed valve seat. Heads are available, but the gaskets are in production and should be ready early next month. 2-3 days for the fix, labor hours are $1800.

Symptoms form Jeep, shudder at low rpm, 14-1500 when under light load, like maintaining speed in traffic or slight uphill. You can power out of it by forcing a downshift, more noticeable for drivers with a light foot. Speed varies as does the severity, from what feels like road irregularities or bad a tire to the washboard feeling. It only happens when the valve is sticking, usually when cold, once it is free, everything is normal.

They let me continue driving until the parts come in, can't do any further damage, but it is really annoying when it happens.

I think I will let them do the other Jeep first just to make sure they don't see any surprises with mine.

This is the first issue I have had in the 20k miles I have driven, other than this, it has been a great vehicle.

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  #2  
Old 06-22-2015, 02:46 PM
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Re: Lean misfire MIL code

I've gotten this code 3x in 5K miles but the vehicle has always ran great.

Thanks for the update.
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  #3  
Old 06-24-2015, 07:43 PM
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Re: Lean misfire MIL code

I got that too and turned out to b egr valve gasket had a leak
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Old 07-14-2015, 12:54 PM
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Re: Lean misfire MIL code

I have now been running with this code for 1200 miles and the misfire only seems to be getting worse. Dealer is saying it is pushed back to at least August, and possibly later. He can't even order parts until this TSB is released from Jeep. How is this even close to being efficient? If the parts are available, (they are still rolling diesel Jeeps off the line after all), but has to wait for a TSB to fix a broken vehicle?

This is now ruining a camping trip to the mountains as I won't drive this out of town, and it looks like I won't be able to tow my boat for the majority of not all of the season.
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Old 07-17-2015, 03:40 PM
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Re: Lean misfire MIL code

Just got a call from Jeep, the TSB was released today. Now to see if parts are actually available
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  #6  
Old 07-21-2015, 03:39 PM
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Re: Lean misfire MIL code

Root cause = carbon buildup. Fix = replace cylinder head with revised version. Dang.

TSB seems to be for 2014 only. Does that mean the 2015 already has the revised part? Or does that mean not enough 2015's have put on enough miles to see the problem manifest?
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Old 07-21-2015, 08:11 PM
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Re: Lean misfire MIL code

WTF, newly designed cylinder heads? My Eco was built at the end of May, hope I got them.
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Old 07-22-2015, 04:06 AM
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Re: Lean misfire MIL code

Mine was November 30, 2014, but model year 2015 - one of the early ones. The TSB doesn't give any build date cut-offs like some have.
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Old 07-22-2015, 09:35 PM
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Re: Lean misfire MIL code

Hm, replace cylinder heads? Seems a bit extreme. Does this mean all 2014's will need this? I've never experienced any shuttering in my 2014 diesel, although I don't live in cold weather areas.
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Old 07-22-2015, 10:31 PM
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Re: Lean misfire MIL code

The TSB says it only affects light duty usage.

Maybe that means we're fine if we romp on the throttle from time to time to dislodge carbon buildup.
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Old 07-23-2015, 12:19 AM
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Re: Lean misfire MIL code

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Originally Posted by akinney View Post
The TSB says it only affects light duty usage.



Maybe that means we're fine if we romp on the throttle from time to time to dislodge carbon buildup.

In the TDI community they suffered from clogged intakes (egr + ccv), and coked turbo vanes from driving too "softly". They coined the term "Italian tune up" where one would romp on it up a long grade or find another way to load it. Heat up EGT's and rev it out.
This worked very well for most folks on stock and modified engines. Hopefully the same applies here.
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Old 08-03-2015, 08:19 AM
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Re: Lean misfire MIL code

EGR of modern diesels is a recipe for carbon buildup - thank you EPA. High revs are not the best way to counter this problem, efficient combustion is more important. Quality fuel and/or a cetane boost goes a long way to help, too.

Really thinking more about that GDE tune and turn that damned thing off. Just not certain how that would affect my annual emission inspection.
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