1992 Chevy Chevelle

1992 CHEVROLET CHEVELLE
167,000 MILES • 4 CYL • 2WD • AUTOMATIC
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KENSCAV
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  • 2 POSTS
FAILED EMISSIONS TEST

LIMIT READING RESULT

HC ppm 68 142 fail

CO% 0.36 0.53 fail

NO ppm 526 1855 fail

RPM 1734 valid

Dilution 14.2 valid

which parts need to be replaced so it will pass test
Jan 13, 2009 at 8:42 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 POSTS
Hi:
I would start by having the O2 sensor tested. Also, is there a check engine light on?

Joe
Jan 28, 2009 at 4:49 PM
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KENSCAV
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no check engine light on but i will replace the o2 sensor. thank you

ps i have since replaced the catylitic converter i will have it checked again could a bad coil pack cause this?
Jan 28, 2009 at 5:20 PM
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 POSTS
A weak spark could cause the fuel to not burn properly, so yes. Have the O2 sensor checked prior to replacing. I don't want you to spend money if it's ok.

Joe
Jan 28, 2009 at 5:37 PM