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Smog Help

Discussion in 'The Garage' started by onlychevy6, Feb 24, 2007.

  1. onlychevy6

    onlychevy6 1/2 ton status

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    Location:
    Hockley, Texas
    What can i do to get the NO (PPM) down?

    @ 15 mph Max is 1050 Ave. is 379 i measured 1229
    @ 25 mph Max is 1050 Ave. is 379 i measured 1191

    Please help. Every thing else is perfect.
     
  2. hidesertwheelin

    hidesertwheelin 1/2 ton status Premium Member

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    Did you drive it around and make sure it was warm before you tested it? Also check your EGR valve.
     
  3. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

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    Check the timing, make sure the egr works and get the cat nice and hot before you test.
     
  4. onlychevy6

    onlychevy6 1/2 ton status

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    There is no Cat on this Suburban? And still has what looks like factory exhaust on it. I am going to replace the EGR soon.

    And Marc it was nice and warm before testing. Drove from San Clemente up to Lake Forest with a few stops in between.
     
  5. roadnotca

    roadnotca 3/4 ton status

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    Kalyfournea allows +/- 4* error on timing, so set it to 5* or 6* BTDC.
     
  6. greyhoundjc

    greyhoundjc 1/2 ton status

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    I ran 2 gallons of methanol in mine to lower the NOx for my test. Lowered it by close to 30% (IIRC). I know it's not a permenant fix, but it helped me pass my emissions test.
     

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