1992 Jeep Cherokee Q&A

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

gasket,exhaust manifold, oil, oil filter, coolant,injector seals, and MAP sensor. Still getting 1300 read @ 25mph. this sucks -
Answer 1
NOX IS CREATED BY HIGH COMBUSTION TEMPS. IS COOLING SYSTEM IN GOOD SHAPE AND ANYTHING ELSE THAT WOULD RAISE CYCLINDER TEMPS. -