1996 Pontiac Grand Am Failed smog test

1996 PONTIAC GRAND AM
111,000 MILES • 4 CYL • FWD • AUTOMATIC
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WEASEL225
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I have no engine codes. Test results as follows

15mph CO2 14.8 O2 .2 HC max 56 ave 9 Meas 97 CO max .51 ave .02 Meas .33 NO max 443 ave 57 Meas 1147

25mph CO2 14.8 O2 .2 HC max 40 ave 7 meas 87 CO max .49 ave .03 meas .35 NO max 730 ave 50 meas 6059

Does this sound like an egr or a Cat Converter?
Apr 20, 2010 at 8:04 PM
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JACOBANDNICKOLAS
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Honestly, either could cause it along with other problems. Has the check engine light come on?
Apr 20, 2010 at 10:06 PM
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WEASEL225
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I previously had a 0335 and a 0300 code and replaced the crank sensor and the coil tower which seems to have the engine running very smooth and strong. My gut feeling is that the Cat was probably damaged before I got this car from bad ignition (0300) and dumped a lot of fuel into the Cat and subsequently burned it out.
Apr 21, 2010 at 1:18 AM
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JACOBANDNICKOLAS
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That is very possible. Have you checked it?
Apr 21, 2010 at 8:09 AM
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WEASEL225
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Having it checked today hopefully.
Apr 21, 2010 at 11:17 AM
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JACOBANDNICKOLAS
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Let me know what you find. I am anxious to see it that is the problem.
Apr 21, 2010 at 1:43 PM
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WEASEL225
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Replaced the Cat and ran it for about 1 hour to burn in the new one and reset code from battery disconnect and it passed with flying colors. Old was almost completely plugged and had taken fuel damage.

Thanks for the help!
Apr 21, 2010 at 3:59 PM
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JACOBANDNICKOLAS
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Great!!! I'm glad you found the problem. Let us know if you have questions in the future.

Joe
Apr 22, 2010 at 7:52 AM
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