*Too Lean* code, they can't figure out why. Any experience with this issue? - Jeep Garage - Jeep Forum

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Old 05-20-2015, 10:58 AM
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*Too Lean* code, they can't figure out why. Any experience with this issue?

Guys I have a 2014 GC Eco-D and it ran fine but had a CIL come on. The dealer says the code reads *engine too lean* but they can find nothing wrong with the vehicle.

They are placing monitoring equipment on the vehicle and going to drive it around to try and see if the code comes back on (2x it happended to me). Has anyone seen this particular problem before?

They gave me a nice loaner so honestly they can keep the thing for 6 months for all I care, I enjoy putting wear and tear on a loaner instead.

Thanks

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Old 05-20-2015, 05:08 PM
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*Too Lean* code, they can't figure out why. Any experience with this issue?

I had this problem right after I had my Cat replaced. They couldn't figure it out either but they ended up saying they cleaned mass air flow sensor and found O-ring rolled on intake air tube which *could* cause an air leak and lean code. Not sure if that's all B.S. or not... It came back once since that service visit but went away before I could bring it back in.
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Old 05-20-2015, 08:55 PM
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Re: *Too Lean* code, they can't figure out why. Any experience with this issue?

Diesels live in a lean world - very strange. An air leak shouldn't cause that. Maybe the mechanic was only trained in gas engines. Did he say you were missing some spark plugs, too?
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Old 05-20-2015, 09:08 PM
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Re: *Too Lean* code, they can't figure out why. Any experience with this issue?

Yeah, I figured they just came up with some explanation to get me on my way. I'm done with that dealership anyway and hopefully this Jeep as I'm going through the lemon law process now. Also, the Jeep resolution team is useless and they don't seem to resolve anything.
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Old 05-20-2015, 11:37 PM
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Re: *Too Lean* code, they can't figure out why. Any experience with this issue?

If you had the P0174 code (IIRC) like I had recently....here's the story:

On the initial code, the dealer simply reflashed the PCM and brought it up to date. A few days later, CEL again appeared and I went back to the dealer...turns out it generated the same error code again despite the updated PCM software.

On the second visit, the tech checked all the obvious issues...fuel flow through the injectors, induction leaks, and the O2 sensor. No issues found. The dealer opened a STAR case with Chrysler to resolve. Engineers told the dealer to replace all the fuel injectors and fuel lines...which they did although the parts had to be ordered (and showed up in three business days).

Car was at the dealer for about 10 days total...but Chrysler did provide a loaner car through Enterprise when I needed one.

Apparently it did solve the problem although I did get another CEL...but it occurred on a Friday so I just kept driving the vehicle since I detected no change in performance. Thankfully, it went away a few days later on its own but have no idea why the vehicle generated a code.

Hope this helps.
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Old 05-21-2015, 07:41 AM
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Re: *Too Lean* code, they can't figure out why. Any experience with this issue?

Good info and I have passed it on to the dealer.

Thanks again!
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Old 05-27-2015, 10:21 AM
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Re: *Too Lean* code, they can't figure out why. Any experience with this issue?

Leaking Charge air cooler at the O-ring apparently was the cause. The engine has a mass air flow sensor and if too much air passes by it, compared to the fuel injected, it shows a lean code.

This O-ring seems to be a problem area on these engines. Probably a very simple fix if you know to go right to it. It was really tough for them to figure out and I had a loaner for 8 days and 900 miles.
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Old 05-27-2015, 02:17 PM
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Re: *Too Lean* code, they can't figure out why. Any experience with this issue?

I'll take your word for it, but I'd think that if the intercooler was leaking, high pressure air would *escape* and then too much fuel would be injected, leading to poor combustion and essentially a Too Rich condition. You have a pic or a link to the O-ring in question?
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Old 05-27-2015, 02:32 PM
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Re: *Too Lean* code, they can't figure out why. Any experience with this issue?

That's an extremely good point. I tried to get them to show me exactly where this O-ring was located but the Service Writer had no idea.

Maybe it was sucking in air thru the O-ring at higher RPMs when the throttle was chopped? hah, I said throttle!
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Old 05-27-2015, 02:34 PM
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Re: *Too Lean* code, they can't figure out why. Any experience with this issue?

Quote:
Originally Posted by Suns_PSD View Post
That's an extremely good point. I tried to get them to show me exactly where this O-ring was located but the Service Writer had no idea.

Maybe it was sucking in air thru the O-ring at higher RPMs when the throttle was chopped?
Maybe, except there is no throttle plate on a diesel.
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Old 05-27-2015, 04:31 PM
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Re: *Too Lean* code, they can't figure out why. Any experience with this issue?

The sensor for the lean/rich mixture has to be in the exhaust stream, the intake air stream has no fuel and thus can't determine lean or rich combustion.
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Old 05-29-2015, 10:10 PM
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Re: *Too Lean* code, they can't figure out why. Any experience with this issue?

Quote:
Originally Posted by carqwik View Post
The sensor for the lean/rich mixture has to be in the exhaust stream, the intake air stream has no fuel and thus can't determine lean or rich combustion.
Usually this is done by the first O2 sensor in the exhaust stream.
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