Smog Failed - Not Ready

[Timoleon]

I had the same problem with a different vehicle. I had a friend or mine that lives in Arizona register the car in his state and did a letter letting me "borrow" the car. That worked until I could move from California.

P. S. I now own 2 newer Jeeps in New Mexico (where I now live) and don't bother with that "stuff".

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[NachoRuby]

Anyone of you guys who were having trouble with the sensor have larger than stock tires? Dealer saying I should try the cycle with some smaller tires back on.

i can't even imagine what tires wold have to do with it. If they replaced PCM and the o2 sensors, and it is still failing, I wonder if they need to do the actual catalytic converters.

 

[intentsrig]

i can't even imagine what tires wold have to do with it. If they replaced PCM and the o2 sensors, and it is still failing, I wonder if they need to do the actual catalytic converters.

Well they have not replaced anything yet. Only an computer update. With no cel codes they say it’s pointless to replace the o2 sensors. Gas mileage is good, no smells, idles smooth as can be.

 

[LostWoods]

Former smog expert but it's been a while... If I were to put my money on it it's the hilly area comment. The biggest problem with some of those drive cycle tests is they have to be done in a specific order and not having access to part of the cycle at the right time might be a concern. Like if you legitimately don't have any smooth, flat(ish) stretches of highway you'll never get a monitor to run that requires 10m at 60mph steady throttle. You either don't add throttle and slow down too much or you give it a little more and it misses the "steady" part.

Two options that come to mind are trying a dealer in a flatter area where they have access to the appropriate stretches of road to do the tests or you can find a shop with a performance dyno who can run the tests in a controlled environment.

 

[ShadowsPapa]

Former smog expert but it's been a while... If I were to put my money on it it's the hilly area comment. The biggest problem with some of those drive cycle tests is they have to be done in a specific order and not having access to part of the cycle at the right time might be a concern. Like if you legitimately don't have any smooth, flat(ish) stretches of highway you'll never get a monitor to run that requires 10m at 60mph steady throttle. You either don't add throttle and slow down too much or you give it a little more and it misses the "steady" part.

Two options that come to mind are trying a dealer in a flatter area where they have access to the appropriate stretches of road to do the tests or you can find a shop with a performance dyno who can run the tests in a controlled environment.

Just speculating here, but what you said above fits with my assumptions that with that gear ratio and those tires, it's likely not meeting the RPM under certain requirements. It's going to be way off from what's expected, and if hilly, even more so.
All changes that impact the driveline will impact emissions. Emissions isn't about what the engine does, it's about what it does in a specific vehicle.
That's why people seem to believe that "hey, the engine passes this and that, should be easy to toss it into the vehicle I want it in, so why doesn't Jeep do that?" - doesn't work that way. Under loads, they act/behave differently.
Guarantee you the 3.6 in the JT is a different tune and behaves differently than the 3.6 in the Grand Cherokee. And if you toss in different gears and heavy massive tires, you've changed the load on it. And the heat put out.

 

[LostWoods]

Just speculating here, but what you said above fits with my assumptions that with that gear ratio and those tires, it's likely not meeting the RPM under certain requirements. It's going to be way off from what's expected, and if hilly, even more so.
All changes that impact the driveline will impact emissions. Emissions isn't about what the engine does, it's about what it does in a specific vehicle.
That's why people seem to believe that "hey, the engine passes this and that, should be easy to toss it into the vehicle I want it in, so why doesn't Jeep do that?" - doesn't work that way. Under loads, they act/behave differently.
Guarantee you the 3.6 in the JT is a different tune and behaves differently than the 3.6 in the Grand Cherokee. And if you toss in different gears and heavy massive tires, you've changed the load on it. And the heat put out.

That very well could be honestly. The ranges were typically pretty generous but if you do something crazy you might get out of the parameters. I don't think you'd have issues with the standard moves as long as you're making the adjustments to the settings.

 

[intentsrig]

I hear what you guys are saying but it’s been over a year since I changed my batteries and it never passed the o2 sensor to ready status.

Also, the dealer took it down to the flat lands and tried the drive cycles a lot.

If the o2 parameters were that sensitive to tires and gears wouldn’t people be having this problem all the time?

 

[ShadowsPapa]

Maybe I missed a post - batteries? I can't see how that can possibly impact anything.

 

[intentsrig]

I’m

Maybe I missed a post - batteries? I can't see how that can possibly impact anything.

Whenever you disconnect your batteries it resets all of your smog sensor data. All become not ready in obd2 and need drive cycles to complete and become ready.

 

[ShadowsPapa]

I’m

Whenever you disconnect your batteries it resets all of your smog sensor data. All become not ready in obd2 and need drive cycles to complete and become ready.

OK, the part that got me was that you said that was a year ago. I wondered what a battery replacement - that long ago especially, would have to do with it because - Normally it only takes a few days of trips or miles to make it emissions ready.
I assume you've taken some longer trips and varied the driving a lot....... especially in a year's time!

 

[intentsrig]

OK, the part that got me was that you said that was a year ago. I wondered what a battery replacement - that long ago especially, would have to do with it because - Normally it only takes a few days of trips or miles to make it emissions ready.
I assume you've taken some longer trips and varied the driving a lot....... especially in a year's time!

Ha yeah exactly. I actually never noticed it hadn’t gone to ready since I have never had any cel, or dtc’s pop up.

 

[guarnibl]

I know this thread is old but dealing with the same issue now. I've put 1000 miles on my Gladiator ecodiesel and it refuses to pass emissions. There's nothing wrong with the vehicle... no CEL, nothing. Just on the ADEQ (Arizona) print out, it shows:

NMHC CATALYST: NOT READY
NOX/SCR: READY
EGR/VVT: READY
EXHAUST GAS: READY
PM FILTER: NOT READY
BOOST: READY

And I fail. I've put over 1k miles on it since testing it December 11th, and today, January 16th. My registration is now expired, my 30 day use permit is expired, MVD refuses to give me another one, and I can't register it out of county. Dealership has no idea what to do. Feels like I'm being forced to sell the vehicle, since there's literally no legal way for me to operate it on the road to even try to continue passing.

And on top of that, I don't think there's any way for me to monitor each of those individual 'OBD READINESS MONITOR STATUS' things.

 

[Lost1wing]

Keep driving. Needs a Regen. Not sure if a forced regen will work. Now that you are expired, that seems to be an option.

 

[guarnibl]

Keep driving. Needs a Regen. Not sure if a forced regen will work. Now that you are expired, that seems to be an option.

Yeah, I'm going go to back to the MVD and show someone else the failed test and see if they'll extend my 30 day. I ordered a couple OBD II ones that'll show I/M status, so hopefully then it's not a shooting in the dark situation when I go to get it tested.

 

[Lost1wing]

Yeah, I'm going go to back to the MVD and show someone else the failed test and see if they'll extend my 30 day. I ordered a couple OBD II ones that'll show I/M status, so hopefully then it's not a shooting in the dark situation when I go to get it tested.

Good plan! Now a real good scan tool could force a regen. You wouldn't need to beg for an extension. Just remember, when clearing codes or disconnecting the battery, you will need to set the readiness monitors all over again.

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