High NOx levels and failed smog test 5 times. replaced cat,plugs,cap,O2,intake on 1992 Jeep Cherokee

gasket,exhaust manifold, oil, oil filter, coolant,injector seals, and MAP sensor. Still getting 1300 read @ 25mph. this sucks

by in Ventura, CA on February 26, 2013
1 answer
ANSWER by on February 26, 2013
NOX IS CREATED BY HIGH COMBUSTION TEMPS. IS COOLING SYSTEM IN GOOD SHAPE AND ANYTHING ELSE THAT WOULD RAISE CYCLINDER TEMPS.