New Cat = Lower NOx?

Discussion in 'Dodge 4x4' started by Yazmeister, Nov 5, 2009.

  1. Yazmeister

    Yazmeister New Member

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    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.
     
  2. redlinebk

    redlinebk Well-Known Member

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

  3. Gerehead8

    Gerehead8 New Member

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    '97's don't have EGR. '95 was the last year.
     
  4. Yazmeister

    Yazmeister New Member

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    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.
     
  5. cds13

    cds13 New Member

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    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.