Sonoma failing NoX test

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– Hide quoted text — Show quoted text – >Most common cause is the egr system, inop or ineffective > I have a 95 GMC Sonoma and the thing is failing the NoX pollution test > at 25 mph. > Any ideas what would be the cause at this speed and not at 15 mph? > Omar >—–= Posted via Newsfeeds.Com, Uncensored Usenet News =—– >http://www.newsfeeds.com – The #1 Newsgroup Service in the World! >—–==  Over 80,000 Newsgroups – 16 Different Servers! =—–

Also could be temperature… my 87 Regal needed a new water pump to pass the NOx test in Ontario.  Check the thermostat, sensors, etc. to make sure that the cyl temp is below  (I think) 500F, where serious NOx starts to form Vuarra 1987 Buick Regal (RWD for highway cruising in comfort) 1997 Dodge Neon (FWD for farting around the city)

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I have a 95 GMC Sonoma and the thing is failing the NoX pollution test at 25 mph. Any ideas what would be the cause at this speed and not at 15 mph? Omar

Response:

Most common cause is the egr system, inop or ineffective > I have a 95 GMC Sonoma and the thing is failing the NoX pollution test > at 25 mph. > Any ideas what would be the cause at this speed and not at 15 mph? > Omar

—–= Posted via Newsfeeds.Com, Uncensored Usenet News =—– http://www.newsfeeds.com – The #1 Newsgroup Service in the World! —–==  Over 80,000 Newsgroups – 16 Different Servers! =—–

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