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Old 10-19-2012, 12:56 PM   #1
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Angry Failed Emissions!!!

Hello,

New to the forum but a jeep owner since 07. I have a 2006 TJ wrangler. I'm having trouble passing my Colorado emissions test. I've taken it 6 times now!
I'm not passing my NOx test. My first test i barley failed it was 2.3 which it needs to be at 2.0 I had a engine light on that indicated my 02 sensor bank 1 sensor 1 was bad I replaced also changed my oil/air filter and went back that following day. My NOx was even higher! 3.9 I got it looked diagnosed and the guy said my 02 sensor we low voltage and werent heating properly, he also said d it's not my Cats. So I took it to a dealer they said my 02 sensors are working fine... They found that my thermostat was leaking so they fixed they also de-carbed my engine. took the test failed again. The dealer said I had another 02 sensor that was about to bit the dust so they replaced and took it to the emissions and it failed Each time they took it in the NOx dropped down. The last thing they told me was to fill my tank up with premium gas and put in iso heet run my jeep a day then take it in to test. Went this morning and still failed. NOx went down again but not enough to pass. I'm about to toss this Jeep in a river! So i need some help with this! can anyone help me?

thanks,

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Old 10-19-2012, 04:22 PM   #2
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Is your engine temp normal which would be right at 210? Installing a lower temp thermostat than the factory specified 195 degree rating can in some conditions cause the engine to not warm up enough to pass a smog test. For best odds of passing, the engine has to be pretty hot.

Running higher octane fuel will NOT help an engine pass its smog test. A higher octane is harder to ignite and burns more slowly which can actually hurt an engine's performance and chances of passing the smog test.

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Old 10-19-2012, 04:35 PM   #3
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Have you taken your spark plugs out lately and seen what they look like and how old are your current spark plugs and plug wires. What your driving habits like, do you go off road thru rivers and or anything like that.
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Old 10-19-2012, 04:41 PM   #4
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not sure about the temp how would I check that? I got the new thermostat installed by a Chrysler dealership so Im pretty sure they would install the factory kind. I drove this morning to the emissions test which is about 30 away from my house should I drive longer then take it?
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Old 10-19-2012, 04:45 PM   #5
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I just replaced the spark plugs this week. the ones I replaced were a little over a year old and when I took them out the gaps on some were way off. I never changed my plug wires.
I usually drive from work and that's it it's thru city traffic stop and go. No off roading since I blew my power steering last time! haha
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Old 10-19-2012, 05:02 PM   #6
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not sure about the temp how would I check that? I got the new thermostat installed by a Chrysler dealership so Im pretty sure they would install the factory kind. I drove this morning to the emissions test which is about 30 away from my house should I drive longer then take it?
30 minutes is long enough for it to get fully up to temperature. You check the engine temp with your engine temperature gauge on your instrument panel. It should indicate 210 or slightly higher to have the best chance of passing the smog test.

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Old 10-19-2012, 05:14 PM   #7
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New cats will get you in the passing range but it'll only be temporary until you find what's causing your cat/s to go bad. Running rich enough to dump raw fuel into the cat will do it every time.
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Old 10-19-2012, 05:26 PM   #8
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High NOX levels come from a lean condition. The a/f ratio is being skewed into a too lean zone by something. Sometimes a MAP sensor that is outputting wrong can do this. Faulty O2 sensor signals could be causing it too. Try to find what might be leaning the mixture out. Is this only at cruise conditions where it is failing?
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Old 10-19-2012, 05:27 PM   #9
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30 minutes is long enough for it to get fully up to temperature. You check the engine temp with your engine temperature gauge on your instrument panel. It should indicate 210 or slightly higher to have the best chance of passing the smog test.


Ooo duh... ill check when I drive home see if it gets to temp..
thanks.. Im in desperate mode over here. I afraid it might be my cats which ill just end up bitting the bullet to get it fixed. I was just hoping for a easier cheaper solution. How about fuel additives?
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Old 10-19-2012, 05:38 PM   #10
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While buying a fuel additive will help improve the profits of the auto parts store and the additive's manufacturer, it won't help your engine pass smog in the least. Not one small iota. Save your $$$.
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Old 10-19-2012, 05:53 PM   #11
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High NOX levels come from a lean condition. The a/f ratio is being skewed into a too lean zone by something. Sometimes a MAP sensor that is outputting wrong can do this. Faulty O2 sensor signals could be causing it too. Try to find what might be leaning the mixture out. Is this only at cruise conditions where it is failing?
Yup. Or timing off or--most likely in my experience--a faulty EGR system, but I don't know if the TJ has one or relies on a three way cat and mixture control for NOx.
The combustion inside the cylinders is likely too hot and creating the NOx if the cats are good.
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Old 10-19-2012, 06:19 PM   #12
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Originally Posted by colorubi
High NOX levels come from a lean condition. The a/f ratio is being skewed into a too lean zone by something. Sometimes a MAP sensor that is outputting wrong can do this. Faulty O2 sensor signals could be causing it too. Try to find what might be leaning the mixture out. Is this only at cruise conditions where it is failing?
My test just says fail and shows a diagram tht I don't know how to read maybe u can cypher it.

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Old 10-19-2012, 06:36 PM   #13
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I'd say they put a thermostat more like a 185 or a 180 in when they replaced it. it happened to dad once in Idaho. his car didn't have a thermostat so it never really warmed up. he got it tested it failed, Lucky the shop he took it to was run by an old school mechanic who knew a thing or two. he replaced it and it passed.
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Old 10-20-2012, 09:50 AM   #14
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I think we need to back up to the part about Plug Wires and Plugs. Possible dirty Intakes. City driving will kill a engine.
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Old 10-21-2012, 01:13 PM   #15
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The NOX levels are spiking sharply-particularly when the vehicle speed is increasing (accelerating) I would want to look for a lean mixture, or maybe an overly advanced ignition. Try pulling the plugs and look for a cylinder/cylinders that show heat signs on the insulator/electrode. Check for an injector that may be plugging/failing. Heavy carbon buildup could cause this but I would only expect it on a heavy oil burning motor. Is your fuel pressure steady? I assume you are getting no trouble codes or pending codes?
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Old 01-05-2013, 05:07 PM   #16
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Update! After everything was said and done tried to many short cuts tht never worked in the end it was my cat. I replaced all cats. In the process of replacing I had to replace another 02 sensor and look what was on it. Should of pulled it out on day one...

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Old 01-05-2013, 05:49 PM   #17
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I just recently had my TJ pass Colorado emissions after failing 3 tests. Mine turned out being the ECU needing rebuilding.
Good to know you didnt send it into the river. That crossed my mind too...

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