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  1. GregBelleville

    And just like that, I found one

    Whoa whoa whoa, since when do new owners get to make a first post here without it being how to fix something that's already broke? 😜 Congrats! Looks like a blank slate.
  2. GregBelleville

    Failed smog test for high nox

    Like it or not I went with your suggestion Mac. I'm going to let this cure tonight and then take it back in for a retest this week hopefully and see if that solves it or if I move on to the cat.
  3. GregBelleville

    Failed smog test for high nox

    Hey Mac, if you were going to use high temp rtv to seal this flange, how would you go about that? Line both sides of the pipe with it before replacing the donut seal?
  4. GregBelleville

    Failed smog test for high nox

    I found this post from another forum from a smog tech, brand new exhaust system that was leaking at the clamps. Once the leak was resolved the NOX levels came down: LETS TALK EXHAUST LEAKS.... if you have 3% oxygen entering the exhaust system ahead of the cat in ANYWAY, cracked header, burned...
  5. GregBelleville

    Failed smog test for high nox

    Thanks for the tip, I might see if I can get my hands on one to try that out.
  6. GregBelleville

    Failed smog test for high nox

    Unfortunately no, my exhaust is welded from the down pipe all the way back.
  7. GregBelleville

    Failed smog test for high nox

    I would like to get this flange sealed properly and retest it to see if that improves the NOX. From what I know, any leaks prior to the cat will cause NOX to increase. I want to rule that out as a cheap solution before spending big money.
  8. GregBelleville

    Failed smog test for high nox

    I leak tested the exhaust today by blowing air through the tail pipe with my shop vac. Only leak I found ahead of the cat is at the manifold to the exhaust pipe flange. I believe the FSM says torque spec for these flange bolts if only 23 ft lbs? I checked both bolts and they were already at or...
  9. GregBelleville

    Failed smog test for high nox

    Ok, well it was worth asking. No, never had pinging issue. For now my plan is to inspect for exhaust leaks ahead of the cat and to inspect the vacuum lines as thoroughly as possible for a leak as I also have a high idle to solve for.
  10. GregBelleville

    Failed smog test for high nox

    It's possible, I've owned this Jeep for about 2 years, and haven't replaced the thermostat in that time. Could the high NOX and the low engine temp be possibly related? From what I've read, high nox is caused by high combustion chamber temps, so I would think the engine running cooler would be...
  11. GregBelleville

    Failed smog test for high nox

    Here's some readings I took off my obd tonight after about a 45 minute drive home. Engine running at 192 which seems cool no?
  12. GregBelleville

    Failed smog test for high nox

    I do Glamis every February, come on out!
  13. GregBelleville

    Perception vs. reality

    First question would be why did you drive the trail in reverse?
  14. GregBelleville

    Failed smog test for high nox

    LOL, yeah I'm going to try and figure out if I can fix the Jeep and pass smog, but if I can't, can my family and I crash on your couch?
  15. GregBelleville

    Failed smog test for high nox

    It's originally from Texas.
  16. GregBelleville

    Failed smog test for high nox

    I did find that rock auto has Mopar O2 sensors, but the prices are eye watering.
  17. GregBelleville

    Failed smog test for high nox

    Hmm, I just checked rock auto and for my 1999, which only has 2 O2 sensors, they didn't show any ngk available.
  18. GregBelleville

    Failed smog test for high nox

    https://www.wranglerforum.com/threads/smog-help-hi-nox-this-was-the-fix-3-jeeps.1569817/ I found this post on the other forum from an actual smog tech here in Socal giving several causes for high NOX in jeeps. He gives several helpful tips on possible culprits for high NOX which I'm going to...
  19. GregBelleville

    Failed smog test for high nox

    Thanks for the reply Jerry. So you think the cat is the most likely culprit? Is there a way to test a catalytic converter to confirm before I replace it since they're so expensive?
  20. GregBelleville

    Failed smog test for high nox

    Hi all, I live in Socal and am due for my first smog test since owning my TJ, which is a 99, 4.0. it's got 192k miles on it and no CEL codes. I took it in this morning and it failed due to NOX being too high. The tech recommended looking at the O2 sensor as a possible cause, and I know the...