Colorado Emissions Testing 3-years of Results
 

I have the records from my last 3 Colorado Emissions Testing The vehicle passed each time:

August 2007:

HC GPM: 2.2410
CO GPM: 18.2046
CO2 GPM: 600.7220
NOX GPM: 2.7124

July 2009:

HC GPM: 1.0729
CO GPM: 8.6771
CO2 GPM: 566.5227
NOX GPM: 2.0828

July 2011:

HC GPM: 0.8026
CO GPM: 6.3390
CO2 GPM: 493.0725
NOX GPM: 1.4023

It is a 1994 Discovery I with just under 140,000 miles, manual transmission. I have worked hard on these vehicle and I am very happy with the results. I would like to compare my results to other Discovery I's that have under gone similar testing.

Derek V

Good thing they don't test for the main product emitted - liquid lubrication, which usually comes out everywhere but the tail pipe....

But you do show the results of good repair practices. My backwards state does not even require testing except in the metro Atlanta area (13 counties out of 159).

Not only that but I'm sure all the atmospheric variables were different during each testing. Those numbers seem to be dropping as the vehicle gets older. Strange. I would expect the numbers to stay near the same or increase with age.

What is it that you're trying to learn?

I believe I have my last 2 tests. I passed as well with flying colors. I will post them up when I get a chance.

"What is it that you're trying to learn?"

I would like to know if it is all the work I have done to the truck that has improved the numbers each time, or are the tests not accurate and I have just gotten lucky. The results of the tests do reflect the work I have done, but without a comparison, I don't have enough data to know for sure.

As for oil leaks, I am down to almost none.

Derek V

Derek V

Sounds like you're looking for numbers from folks who have NOT done work over the course of their tests in order to have a baseline to compare to your numbers. If I have my last few sheets, then I could provide that. Though, my mileage is only up to 113,000 at the moment.

Looks like I tossed my older ones (a pass is a pass, so I didn't bother keeping). But I have a couple from the PO/OO.

Dec 2004; 91,852 miles

HC: .4396
CO: 8.8279
CO2: 837.5925
NOX: 1.2831

Nov 2005; 93,505 miles

HC: .4497
CO: 6.9588
CO2: 802.9483
NOX: 1.5435

May 2010; 110,697 miles

HC: .1287
CO: 3.9402
CO2: 699.7577
NOX: .6248

Wow, my number got way better between the PO/OO and my last test. Really wish I hadn't tossed the tests in between (I purchased in spring 2006). What's weird is that I haven't done any major changes until this year (new injectors, cap, rotor, wires, plugs, etc.) Maybe the PO/OO did some repairs right before selling it - I have way too many receipts and no desire to dig through them to figure it out (most, if not all the work done under the OO/PO, was done by a mechanic... thus lots of receipts).

Not sure if this helps or hurts the analysis. :)

Wow, I feel sorry for you guys, we dont have emissions testing here.
How much does it cost to get tested each year?

I would like to see a comparison to a DII emissions testing though.

Year dependent - 1982 and newer = $25, 1981 and older = $15.