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Big-J
05-06-2009, 01:18 PM
I have a 99 4Runner and failed the NOx test, anyone know how to fix this and/or where? I only have ten days to get this done, or I will have to pay for another emissions test.

PabloCruise
05-06-2009, 01:50 PM
Whoa!

A '99 failing?

NOx can be governed by effective EGR, but to be honest, I do not have a clue about your vehicle's engine.

Fresh oil?
Clean air filter?
Clean plugs?

corsair23
05-06-2009, 01:52 PM
Did you get it good and warm before the test or drive it in relatively cold? I failed long ago once in my '82 pickup but after a good 15+ minute drive on the highway it passed no problem. If nothing else, after you address any other issues try this right before the retest.

Crash
05-06-2009, 02:14 PM
BVB is compiling a list of emission test #s and what was done to get failed trucks to pass. In my case, an '88 Cruiser with aftermarket cat installed in 2003, passing required a new cat be installed before it passed with flying colors. A few more facts about your truck and the fail #s could be instructional for getting the help you ask for.

Big-J
05-06-2009, 04:20 PM
I dont know exectly what codes you're looking for, but here is what it says.

NOx Readings- 6.9437
Limits- 2.000

Should I be looking for something else?
Its a 99runner, v6, 4x4

PabloCruise
05-06-2009, 04:23 PM
This is what I got, I have no idea what any of it means except PASS and Fail. lol

???

Were you attempting to post or link something?

Big-J
05-06-2009, 04:26 PM
???

Were you attempting to post or link something?

Yes, but it was gonna post up my inspection report, cuz all I understand is pass and fail. File was too big though and can't figure out how to resize a pdf. I just have too much going on at once.

wesintl
05-06-2009, 04:39 PM
max pdf is 500kb. how big is it?

my .02 is probably a cat

Big-J
05-06-2009, 04:42 PM
max pdf is 500kb. how big is it?

1.06mb

subzali
05-06-2009, 04:53 PM
can you post up your other numbers too? Like HC, CO2, etc.? When something goes up, sometimes something else goes down and it might help you figure it out.

Big-J
05-06-2009, 04:58 PM
can you post up your other numbers too? Like HC, CO2, etc.? When something goes up, sometimes something else goes down and it might help you figure it out.

Sure.

HC Reading- 0.1273
Limits - 1.2000

CO Reading- 0.0737
Limits - 15.0000

CO2 Reading- 450.0375
Limits - na

NOx Reading- 6.9437
Limits - 2.0000

subzali
05-07-2009, 08:26 AM
They usually have suggestions on what may be causing some numbers to be high - what does it say?

I can't remember exactly what a catalytic converter does, but isn't it supposed to help decrease NOx? It's been a while since I had chemistry class, but it seems like excessively high combustion temperatures increase NOx production. So whatever might cause that (retarded timing?).

Just some thoughts...

Crash
05-07-2009, 08:39 AM
High NOx was the failure point of my '88 Cruiser with the other catagories well within limits. Replaced the O2 sensors and the cat but I'm pretty sure the old sensors were fine - I replaced them as preventive maintenance. NOx numbers dropped to within limits without any other changes besides the new cat and sensors. Timing was set at stock 7*BTDC.
Good luck!

Rzeppa
05-07-2009, 05:55 PM
I was told recently that Colorado drastically lowered their NxOx limits. What used to pass, doesn't any more.:(