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Unread 03-10-2014, 06:23 PM   #1
langwilliams
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failed echeck today high NOx

I failed echeck today in Ohio. NOx was just a little high, all other numbers passed. I just bought this 95 4.0 auto wrangler an have only driven it about 10 miles total before taking taking it in for testing. Had trouble getting a top for it, got that done today. any chance that driving it an running some injector cleaner through it will help? I read you can cheat a little by retarding the timing. I have a timing light from my 5.0 days just need to know how the jeep works (do you have to unplug anything before, etc). any info appreciated!

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Unread 03-10-2014, 08:17 PM   #2
Mark05059
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your engine timing is controlled by the computer so that isnt going to work...
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Unread 03-10-2014, 08:33 PM   #3
langwilliams
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on the 5.0's you could pull a plug, set the base then the computer timed it off that base
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Unread 03-10-2014, 09:27 PM   #4
AmmitOsiris
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[QUOTE="langwilliams"]on the 5.0's you could pull a plug, set the base then the computer timed it off that base[/QUOTEthats how my 4.2 works let me consult my manual and get back

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Unread 03-11-2014, 06:23 AM   #5
Why J?
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I your EGR hooked up? The EGR reduces NOX, verify that it is working properly.

Edit: sorry no EGR on your year. Brains not working yet this morning with the time change.
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Unread 03-11-2014, 07:46 AM   #6
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I didn't know we had EGR's. You should drive it until the cat gets up to temp. That's when it the most efficient. But if you really want to pass smog, replace the cat.
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Unread 03-11-2014, 08:36 AM   #7
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I didn't know we had EGR's. You should drive it until the cat gets up to temp. That's when it the most efficient. But if you really want to pass smog, replace the cat.
Your right, I was mistaken.
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Unread 03-11-2014, 08:37 AM   #8
Que89YJ
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No egr on the 91-95. If you are running high nox it is usually related to the cat. Alcohol additive or a few gallons of E85 will probably get you through if it is real marignal.
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Unread 03-11-2014, 09:51 PM   #9
langwilliams
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it's not over by much. standard is like 1050 an I'm at 1115ish. there's some sort of vac lines coming off the rear of the valve cover that the PO stuck in there an taped in place, could this be a little vac leak?
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Unread 03-12-2014, 09:11 AM   #10
Que89YJ
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Try the alcohol, ethanol. You will need to replace the cat sooner or later.
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Unread 03-12-2014, 04:41 PM   #11
langwilliams
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Que I get the feeling you're right, hoping to pass it now an not have to deal with it for another 2 years an use that money to fix some other issues I found with it. thanks.
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Unread 03-12-2014, 07:16 PM   #12
82gt
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I was able to induce a small vacuum leak, but finally replaced the cat and have been groovy ever since
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Unread 03-12-2014, 10:03 PM   #13
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Originally Posted by Que89YJ View Post
No egr on the 91-95. If you are running high nox it is usually related to the cat. Alcohol additive or a few gallons of E85 will probably get you through if it is real marignal.
Exactly what I had to do, replaced my cat with a cheap universal from Oriellys and problem solved.
I just cut the Flange off my OEM one (catalytic convertor), and welded it onto the new one after measuring.
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Unread 03-12-2014, 10:05 PM   #14
langwilliams
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I'm going to try some alcohol in 93 oct gas in hopes of sneaking thru an replace the cat before it needs tested again in 2 years
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Unread 03-13-2014, 02:10 AM   #15
carnuck
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If not, one heat range colder plug works too. You may have the high altitude CPS (on the bell housing) which is advanced slightly. More timing advance = more NOx.
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