RE: Re: Failed Colorado Emissions High NOx A little long....

From: Bernd D. Ratsch (bernd@dodgetrucks.org)
Date: Sat Jul 19 2008 - 16:13:22 EDT


Yes, it can be a bad cat. Cat's convert HC, CO, and NOx into CO2 and H2O.
However, I'd be calling the repair bureau and find out what they can do
since even in stock configuration, it can't pass.

- Bernd

----- Original Message -----
From: "Mike Guzinski" <mguzinski@gmail.com>
To: <dakota-truck@dakota-truck.net>
Sent: Saturday, July 19, 2008 12:20 PM
Subject: DML: Failed Colorado Emissions High NOx A little long....

>
> Hey all,
> It's been a while since I have done much on the list but now it seems
> I am (or Air Care Colorado is) having a problem with my 99 Dakota. I
> have a 5.2 L 4x4 with a K&N FIPK Mopar Performance PCM MSD wires,
> brass cap and roter, Viper electric fan, 180 deg stat. I don't put
> too many miles on this a year, My daily driver is an 06 Magnum R/T.
> Here are my results in the 3 yes 3 tests I failed!
>
> The first test I had the oil changed and cleaned the K&N and put in a
> quart of denatured alcohol in the tank with 4 gallons of gas. I ran
> it up to temp for about 45 minutes.
>
> Reading Limit
> HC GPM 0.6615 1.2 Pass
> CO GPM 8.5833 15.00 Pass
> CO2GPM 520.8941
> NOx GPM 2.7288 2.0 Fail
>
> The second test I installed new factory spec NGK plugs gapped to .045.
> I put in a bottle of B&G 44k then I ran the tank of gas down to about
> half a gallon and refilled it with 10 gallons of premium 91 octain.
>
> HC GPM 0.8090 1.2 Pass
> CO GPM 6.6932 15.0 Pass
> CO2GPM 519.0306
> NOx GMP 2.6831 2.0 Fail
>
> The third time I took out the 180 stat and put in a new 195. I took
> out the Mopar Performance PCM and replaced with the factory PCM.
> Regapped the plugs to .040 which is factory spec. I followed the
> reprogram procedures on the list for the OBDII. I also checked the
> cat, it "appears" to be good and I also checked for vac leaks. I
> looked for the EGR valve...lol....there isn't one.
>
> HC GPM 0.9292 1.2 Pass
> CO GPM 11.3572 15.0 Pass
> CO2GPM 512.0061
> NOx GMP 2.9614 2.0 Fail
>
> I also looked back to see what my truck was at on my older emissions
> test from 2004 and 2006 Here is what I got:
>
> 2004
> HC GPM 0.8641 4.0 Pass
> CO GPM 12.6890 20.0 Pass
> CO2GPM 511.1926
> NOx GMP 2.8967 9.0 Pass
>
> 2006
> HC GPM 1.6168 4.0 Pass
> CO GPM 17.8321 20.0 Pass
> CO2GPM 512.0025
> NOx GMP 4.5176 9.0 Pass
>
> Now they toughened the standards since 2006 and on the new tougher
> standards my truck would have never passed. Now it has 158000 miles
> on it and it's cleaner than it was when it was only 4 years new. I am
> just finding nothing that will change the NOx levels at all. Could it
> be the CAT? Wouldn't the other leveles be high if the cat was bad? I
> have never had any check engine lights and does not show any codes.
> Any suggestions you have would be great.
> Thanks,
> Mike
>
>



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