FAILED EMMISSION TEST HC AT 2500 708

  • Tiny
  • Anonymous
  • 1993 Ford E-Series Van
  • 125,000 miles

Failed emmission test HC AT 2500 =708.6 IDLE =627.4
@ 2500 CO% 1.11 AND.87 @ IDLE. @ 2500 CO2% 8.9865 & @ IDLE 8.1391 WHAT COULD IT BE

Sunday, February 10th, 2013 AT 7:19 PM

1 Answer

  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

Could be a lazy o2 sensor, rich mixture or contaminated oil. How old are the spark plugs?

Roy

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Sunday, February 10th, 2013 AT 7:36 PM

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