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1994 Honda Civic LX 1.5 L - Failed High Speed Emissions Nox(ppm)


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Jwb014
New User

Nov 6, 2012, 1:09 PM

Post #1 of 2 (1606 views)
1994 Honda Civic LX 1.5 L - Failed High Speed Emissions Nox(ppm) Sign In

I took my car in for inspection. It failed the High Speed Emissions Nox(ppm) test. The Standard is 1240 and my result was 1267. How can I lower my Nox(ppm)?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 6, 2012, 1:20 PM

Post #2 of 2 (1599 views)
Re: 1994 Honda Civic LX 1.5 L - Failed High Speed Emissions Nox(ppm) Sign In

NOX is caused by high combustion temperatures so look at things like

  • EGR system inoperative
  • engine temp too high
  • heavy carbon buildup on piston dome
  • timing too far advanced (although too low will cause high HC)




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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