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  1. #1
    Master Mechanic bigdaddy77084's Avatar
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    Default Failed emissions test

    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?
    95 tahoe 2dr 4x4 200,000+ miles

  2. #2
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    Enkeiavalanche's Avatar
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    Put some Sea Foam in it and clean the MAF and see what happens..
    08 Z71 Avalanche Mods to date: K&N CAI,Hellwig Swaybars and End Links, Corsa Sport Exhaust, Superchips Programer,IPCW LOF & 3rd brake light and tails, AMI Gas door,Show Hooks and Door locks, Enkei Wheels, with Pirelli tires, StreetScene Bowties, Grant Steering wheel,Muth signal mirrors,SSBC Big Brake kit,Huskyliner Mug gards,Floor mats and Hood shield, McGard Lug nuts and locks, Bedrug, Cervini's Ram Air hood,35watt HID Fog lights, Sylvania bulbs all around ZXE's Highs and Lows, WhiteNight Back up lights,Sirius and HD Radio, SnugTop sitting on deck now Got a Softopper on now,Tempress Boat Hatches.... New Bilstein shocks are on... New Mods coming soon..... X

  3. #3

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

  4. #4
    Master Mechanic bigdaddy77084's Avatar
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    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. #5

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    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. #6
    Master Mechanic bigdaddy77084's Avatar
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    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. #7
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    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. #8
    Master Mechanic bigdaddy77084's Avatar
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    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. #9
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    Quote Originally Posted by bigdaddy77084 View Post
    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.
    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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