throwing check engine? distributor timing advanced? changed your spark plugs lately? cat . converter good? is your engine at operating temp when you run the test? lots of these can make a N0x level skyrocket, double check and try again.


i accidentally left my D15B dizzy timing advanced pretty far and did a 2000+ N0x... retarded it all the way and it came down to almost 8-900ish, so try that