My car failed the NO ppm test. What do I to fix it?
It would help … if you could tell us all the reading and the limits. Also if the vehicle failed at idle, or under load.
put a REALLY large and short exhuast tip on it :twisted:
and when they tell you they’re having trouble testing it, tell them to “go suck a lemon”
lossen the cat from the DP a little? some poisonous exh. will escape before the testing device can find them
hc ppm = 9(running25mph), 8 idling
CO = 0.02---------------, 0.01 idle
HO =875----------750 is the limit
With the little info given … it looks like you need a cat.
Is your EGR sytem working?