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1992 Chevy Chevelle

Tiny
KENSCAV
  • MEMBER
  • 1992 CHEVROLET CHEVELLE
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 167,000 MILES
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
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Tuesday, January 13th, 2009 AT 8:42 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,262 POSTS
Hi:
I would start by having the O2 sensor tested. Also, is there a check engine light on?

Joe
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Wednesday, January 28th, 2009 AT 4:49 PM
Tiny
KENSCAV
  • MEMBER
  • 2 POSTS
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?
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Wednesday, January 28th, 2009 AT 5:20 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,262 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
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Wednesday, January 28th, 2009 AT 5:37 PM

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