Failed emissions test

Discussion in 'GM Powertrain' started by bigdaddy77084, Mar 2, 2013.

  1. bigdaddy77084

    bigdaddy77084 Rockstar 4 Years 500 Posts

    These stupid Texas inspection!!!! Never failed before,but now it failed the Emissions test only on the high speed one. Any ideas? Will a basic tune up fix it? Has anyone tried the CRC 05063?
     
  2. Enkeiavalanche

    Enkeiavalanche Rockstar 4 Years ROTM Winner 5000 Posts

    Put some Sea Foam in it and clean the MAF and see what happens..
     
  3. 95C1500

    95C1500 Member 2 Years 100 Posts

    I used RXP. Drove it about 70 miles and they had a hard time getting it to pass.
     
  4. bigdaddy77084

    bigdaddy77084 Rockstar 4 Years 500 Posts

    A 95 5.7 dont have a MAF. I will use the seafoam again,I think I will pull the EGR and clean it as well.
     
  5. tbplus10

    tbplus10 Epic Member Staff Member 5+ Years 5000 Posts Platinum Contributor

    Yea I'd say a tune-up and some internal engine cleaning.
    Might try changing the oil if it's close to being due, I've had decent luck with that on a few of my resale cars/trucks.
     
  6. bigdaddy77084

    bigdaddy77084 Rockstar 4 Years 500 Posts

    New EGR, bottle of seafoam, 15 gallons of Shell V power 93 octane and the old hoe passed. Not by a little it was like the day I got it.
     
  7. j cat

    j cat Rockstar 4 Years 1000 Posts

    the egr spring I found on these type engines is good for 100,ooomiles then the spring gets weak and you get a little too much egr opening. then you will fail with too much co and hydrocarbon levels.
     
  8. bigdaddy77084

    bigdaddy77084 Rockstar 4 Years 500 Posts

    Yep you could push it in easy with you finger. Plus it had a little spark knock to it. Not no more. Plus the wife put that walmart gas in it didnt help.
     
  9. j cat

    j cat Rockstar 4 Years 1000 Posts

    low quality fuel will mess up and wear the injectors. then you can get a knock from excess carbon on the/in the combustion chamber . that would cause a emissions problem. mpg should improve with the injectors and egr operation now corrected.
     

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