Tighter Colorado emissions standards starting 1/1/22

effjay80

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Feb 7, 2017
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213
Location
Northern Colorado
My last Larimer County emissions run was 2020 and the stated limits for my 94 were:
HC GPM Limit 2.0
CO GPM Limit 20.0
NOx GPM Limit 4.0

The inspection covered Gas Cap, Gas Cap Integrity, Catalytic Presence, Air Injection System Presence, and Oxygen Sensor Presence.

I'm going to go next week since I'm due early 2022 anyway.
 
Joined
Jan 31, 2005
Messages
4,037
Location
Denver CO
Crap. Here are the numbers for mine in Jeffco: does anyone know if we are considered light trucks or light vehicles excluding trucks? Light trucks have a slightly higher limit (in parentheses)

96
HC .6 2018 limit 1.2 new limit .8 (or 1)
CO 7.7 limit 15
NOx 1.9 2018 limit 3.5 new limit 1.5 (or 2)

May not pass NOx depending on which limit they choose.

97
HC .4 2020 limit 1.2 new limit .8 (or 1)
CO 11 limit 15
NOx 2.6 2020 limit 3.0 new limit 1.5 (or 2)

Wouldn’t pass NOx either way. Looks like I need to figure out how to get the NOx down.
 
Joined
Feb 13, 2010
Messages
424
Crap. Here are the numbers for mine in Jeffco: does anyone know if we are considered light trucks or light vehicles excluding trucks? Light trucks have a slightly higher limit (in parentheses)

96
HC .6 2018 limit 1.2 new limit .8 (or 1)
CO 7.7 limit 15
NOx 1.9 2018 limit 3.5 new limit 1.5 (or 2)

May not pass NOx depending on which limit they choose.

97
HC .4 2020 limit 1.2 new limit .8 (or 1)
CO 11 limit 15
NOx 2.6 2020 limit 3.0 new limit 1.5 (or 2)

Wouldn’t pass NOx either way. Looks like I need to figure out how to get the NOx down.
Based on the previous limits which I erroneously posted earlier in the thread, and the actual limits stated on my recent tests, I concluded that 80 Series are light duty trucks.
 

smritte

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Apr 29, 2013
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388
Location
Ontario Ca
Did I see somewhere someone say 35in tires and they just do an OBDII test…??
I started reading the data and it made my head hurt.

Are they going to require dyno testing? Here (Cali) being AWD they only did OBD, dyno was required for 2wd only. 4 wheel dynos are expensive, hell 2wd dynos are expensive.

What I'm trying to say is, if you have an AWD vehicle, good luck finding an AWD smog check. I hope they exclude AWD's.
 
Joined
Feb 13, 2010
Messages
424
I started reading the data and it made my head hurt.

Are they going to require dyno testing? Here (Cali) being AWD they only did OBD, dyno was required for 2wd only. 4 wheel dynos are expensive, hell 2wd dynos are expensive.

What I'm trying to say is, if you have an AWD vehicle, good luck finding an AWD smog check. I hope they exclude AWD's.
Nope. All the stations have AWD dynos
 
Joined
Feb 13, 2010
Messages
424
According to this it’s being done to earn air quality credits whatever that means.
 
Joined
Feb 13, 2010
Messages
424
My impression from looking at the graphs produced on my failed tests is that it is better to run with ETC on and overdrive off. I concluded this because it appeared (I am not certain of this), that lower emissions occurred at higher rpm’s right before an up shift. My hypothesis is that overdrive off and ECT on results in a higher average rpm during the test and hence reduced emissions. I am certainly open to different views on this since my certainty is low. There is certainly a peak/valley pattern in acceleration on the graph. If the peal is before an up shift, rather than after an up shift I think it would mean it is better to keep the ETC off. On one of my recent tests, the tech turned off the ECT at some point because when I got in the truck it was off. Overdrive was still off.
 
Joined
Feb 13, 2010
Messages
424
My impression from looking at the graphs produced on my failed tests is that it is better to run with ETC on and overdrive off. I concluded this because it appeared (I am not certain of this), that lower emissions occurred at higher rpm’s right before an up shift. My hypothesis is that overdrive off and ECT on results in a higher average rpm during the test and hence reduced emissions. I am certainly open to different views on this since my certainty is low. There is certainly a peak/valley pattern in acceleration on the graph. If the peal is before an up shift, rather than after an up shift I think it would mean it is better to keep the ETC off. On one of my recent tests, the tech turned off the ECT at some point because when I got in the truck it was off. Overdrive was still off.
I looked at my recent tests again, comparing the test with ETC on and ETC off. The peaks at the shift points are higher with the ETC off than with it on. I think this confirms my view that it’s better to have ETC on.
 
Joined
May 16, 2008
Messages
353
Location
Longmont, CO
Did I see somewhere someone say 35in tires and they just do an OBDII test…??

That had been a rule for a long time and they didn’t enforce it. About 3 years ago they started enforcing it. I was led to believe that the Greeley shop could handle 35s so I went up there. Nope.

And yeah, they will do some OBDII test and mine has it but since their damn book says “96 and later” and mine is a late 95 with it, they couldn’t do it.

So I registered under my house in Mineral County. I tried.
 
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Joined
Feb 13, 2010
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424
This I suspect

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Haggis

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Nov 15, 2011
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1,482
Location
Wyoming
Wow, very sorry to see this emission insanity spreading to your neck of the woods. Most of these rigs just see weekend, recreation use at least that's my case. I've lived the nightmare in Kalifornia.
 
Joined
Nov 17, 2021
Messages
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Location
Arlington, Wa
Wow, very sorry to see this emission insanity spreading to your neck of the woods. Most of these rigs just see weekend, recreation use at least that's my case. I've lived the nightmare in Kalifornia.

I daily mine. Mostly because I already have 4 cars, wanted a land cruiser, so I sold my daily.
 

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