Emission test failure

CADILLAC DEVILLE
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MSCINNAMON
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I have a 1993 Cadillac Sedan Deville with 179,000+ miles on it. I took it through inspection here in Washington, D.C. and it failed emissions testing. Recently, I had a new exhaust system put on it and a tune up. The HC reading was 440,CO was 4.88 and the CO2 was 9.15.How can I prepare for inspection again? Does the gas quality have anything to do with this problem? I can't think of anything else it could be.
May 21, 2007 at 2:28 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
[quote:4f290923b3="mscinnamon"]I have a 1993 Cadillac Sedan Deville with 179,000+ miles on it. I took it through inspection here in Washington, D.C. and it failed emissions testing. Recently, I had a new exhaust system put on it and a tune up. The HC reading was 440,CO was 4.88 and the CO2 was 9.15.How can I prepare for inspection again? Does the gas quality have anything to do with this problem? I can't think of anything else it could be.[/quote:4f290923b3]

Get a major tune-up and oil change for a start
May 24, 2007 at 7:16 PM
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