NO gasses on 1995 GMC Suburban K2500 7.4L

Asked by GuruJJ3VS Aug 12, 2020 at 12:28 AM about the 1995 GMC Suburban K2500 4WD

Question type: Maintenance & Repair

I passed smog but my NO was borderline
high....took off EGR to clean it but it was
really clean.... thinking maybe there is a
blockage in one of the passages....how
should I go about testing the EGR valve
and system in general?

2 Answers

F_O_R answered 4 years ago

HIgh NOx emissions can be from the engine running lean. I will post a link to a guide.

Mark helpful

F_O_R answered 4 years ago

Link. https://www.smogtips.com/failed-high-NO-nitric- oxide.cfm#:~:text=Combustion%20temperatures%20increase%20causing%20high,2.

Mark helpful

Your Answer:

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