Don't have the emissions specs and no recalls regarding the cat for the 5.2L
model. High NOx emissions are normally caused by the following:
Misfire condition (It's a Dodge...they do that..hehehe)
Malfunctioning or improperly adjusted EGR valve (Obviously not on this
vehicle)
Failed oxygen sensor (65K miles people - they do go bad...and really bad at
100K+)
Leak in exhaust tubing upstream of converter (check for black "gook" around
the seams before the cat)
Excessive carbon deposits in combustion chamber
Improper spark advance (can't touch this anyway)
Blocked coolant passage (runs hotter than normal)
Overly lean air-fuel mixture (leaking intake manifold - plenum)
Failed or malfunctioning catalytic converter (Possibility - don't have to
rattle either to fail)
Corroded or damaged engine sensor electrical connections (last resort)
- Bernd
-----Original Message-----
From: Mike Guzinski [mailto:mguzinski@gmail.com]
Sent: Saturday, July 19, 2008 3:51 PM
To: dakota-truck@dakota-truck.net
Subject: Re: DML: RE: Re: Failed Colorado Emissions High NOx A little
long....
Does anyone have any published emissions specs from the factory on
this truck? Does anyone know how low they have blown on emission
tests? It's again a 5.2l 1999 US emissions.
Thanks Again!
On Sat, Jul 19, 2008 at 2:34 PM, Mike Guzinski <mguzinski@gmail.com> wrote:
> It seems that everything else on the truck has been checked and double
> checked. The cat does not rattle and isn't rusted any worse than the
> rest of the exhaust. Not even any dents. I don't think I have seen a
> bad cat without it falling apart. I can't remember who told me but I
> thought I was told that if the screen was in tact and not plugged it
> works. Do they just wear out? I know Dodge had some recalls on cats
> for other Daks and Rams of this era. Bernd, you do seem to be the
> foremost expert in this area. Think I'll look for a new cat. I mean
> everything I have done has had little or no effect. Thanks!
>
> On Sat, Jul 19, 2008 at 2:13 PM, Bernd D. Ratsch <bernd@dodgetrucks.org>
wrote:
>>
>> 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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