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New Cat = Lower NOx?
11-05-2009, 07:43 AM
Post: #1
New Cat = Lower NOx?
1997 1500 5.9L 4x4 (over 200,000 miles)

I miss driving my 1500 especially last week when Colorado received alot of snow. The 1500 failed emissions 3 times this year due to high NOx at idle and the cause is a suspected sunken valve in the #5 cylinder. No vaccuum leak; replaced cap/rotor, plugs and wires, and upflow O2 sensor.

last emission test:
HC - 1.1268 (limit 1.200) -->Pass
CO - 14.3994 (limit 15.000) -->Pass
NOx - 5.0481 (limit 3.000) -->Fail

With alot of miles on the motor, valve job is out of the question so a reman motor. Saving the money for the new motor taking longer then aspected.

Would a new cat. lower the NOx number so my truck can pass emissions? Current cat. (Magnaflow) is over 2 years old. Still plan on getting a reman. motor.

Thank you for your opinion in advance.
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11-05-2009, 11:51 AM
Post: #2
RE: New Cat = Lower NOx?
(11-05-2009 07:43 AM)Yazmeister Wrote:  1997 1500 5.9L 4x4 (over 200,000 miles)

I miss driving my 1500 especially last week when Colorado received alot of snow. The 1500 failed emissions 3 times this year due to high NOx at idle and the cause is a suspected sunken valve in the #5 cylinder. No vaccuum leak; replaced cap/rotor, plugs and wires, and upflow O2 sensor.

last emission test:
HC - 1.1268 (limit 1.200) -->Pass
CO - 14.3994 (limit 15.000) -->Pass
NOx - 5.0481 (limit 3.000) -->Fail

With alot of miles on the motor, valve job is out of the question so a reman motor. Saving the money for the new motor taking longer then aspected.

Would a new cat. lower the NOx number so my truck can pass emissions? Current cat. (Magnaflow) is over 2 years old. Still plan on getting a reman. motor.

Thank you for your opinion in advance.

Make sure your EGR is working. NOX is commonly from high combustion chamber temp and is common in older engines.




Steve

95 Dodge Ram 1500 7" lift, RRG shackle flip, JKW zero rates, u-bolt flip, 38" TSL's, 4:56's, flowmaster 40 series,Detriot locker rear, built trans,

98 Isuzu rodeo : DD
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11-05-2009, 12:09 PM (This post was last modified: 11-05-2009 12:09 PM by Gerehead8.)
Post: #3
RE: New Cat = Lower NOx?
'97's don't have EGR. '95 was the last year.




1994 Dodge Ram 1500 4x4 5.9L - Still a POS (but my DD)
1989 W150 360ci TBI - New Tranny among many other new parts
1980 Dodge Aspen 225ci Slant Six - Getting a 440/A727?
1981 Dodge D250 Crew Cab - Newest Project
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11-13-2009, 10:31 PM
Post: #4
RE: New Cat = Lower NOx?
Any thoughts? Would a new cat lower my NOx number just enough so I can pass emissions? Don't really like to drive bros Chevy K1500 this winter. Thank you in advance.
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11-13-2009, 11:23 PM
Post: #5
RE: New Cat = Lower NOx?
get some denatured alcohol, add it in 2:1 with gasoline(alcohol : gas) and that will make your numbers be well low enough to pass with out a problem then when your done just fill your tank to dilute it or just drain it. the best way to do it is if you are really low on gas anyways.




s|t|A|v|e

99 RAM2500 24V CTD. Edge Juice with attitude, Neon green stack.
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