1993 Cadillac Deville Emissions Failure

CADILLAC DEVILLE
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MSCINNAMON
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  • 1 POST
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
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  • 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

Suggested Repair

Start with a major tune-up and an oil change before the next emissions inspection.

Conversation Summary

The owner of a 1993 Cadillac Deville with over 179,000 miles failed a Washington, D.C. emissions test after installing a new exhaust system and having a tune-up. Readings were HC 440, CO 4.88, and CO2 9.15. They asked how to prepare for reinspection and whether fuel quality could be involved. The expert advised starting with a major tune-up and an oil change.

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