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Just barely failed emissions(dammit)

Discussion in 'The Injection Section' started by 88-383, Jul 3, 2006.

  1. 88-383

    88-383 1/2 ton status

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    My HC's moved just outside passing when the truck shifted gears and went into 3rd during the loaded dyno emission test at 25mph. I'm wondering whats the easiest way to get a pass? Should I try and lean it a little more in 3rd w/light load? Play with timming? Fuel pressure?

    Thanks

    Kelvin

    http://www.jaybquick.com/_Kelvin_Upload/Smog Test-1.tif

    Setup:355,10.1,CNC TF 195's,Ported Edelbrock manifold,46mmT-body,75#inj's,219@.050 .520 HR etc....
     
  2. 1979jimmy350

    1979jimmy350 1/2 ton status

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    you could pull a little timing and maby a little fuel
     
  3. 88-383

    88-383 1/2 ton status

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    Yup, I think another chip will have to be burnt:doah:

    KM
     
  4. Creek

    Creek Registered Member

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    You might want to look at the Accel. Enrichment Vs. Differential MAP table. Also be aware that once the mixture gets too lean it can cause hydrocarbons to be high because the flame front can't sustain its self across the chamber. This is more predominate during high cylinder pressures (higher MAP) such as occurs when the RPM drops under load. Also look at your knock counts at that time as detonation can cause an incomplete burn.
     
  5. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    A new cat will cure it. :thumb:
     
  6. 88-383

    88-383 1/2 ton status

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    I wish, it has a brand new factory cat with about 30mi on it. I'll post back after I get it sorted out.

    km
     
  7. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Well, was the vehicle nice and hot when you had them smog it, if not that will make a difference.
     
  8. MrArmyAnt

    MrArmyAnt 1/2 ton status

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    Or jam it in 4wd, here in texas they usually dont dyno 4wd, just neutral and smog test... If that.
     

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