Ek_Alex
New Member
so i have a 96 civic stock besides the (2.25) piping and dc sport headers CARB legal so i went to take my car to smog it and i failed 3 times today the first time i got on the NOx 15mph 1074 max is 487 and at 25mph 1098 the max is 774 so i replaced my iridium spark plugs with ngk copper and took it in a different place the other guy didn't know what he was doing horrible experience said i had the wrong cat anyways so the 2nd time i took it in i got at 15mph NOx 831 and at 25mph 959 so this time was a bit lower so i ask whats going on smog guy told me it could be my dc sport header CARB legal could be flowing in to much air to the cat and cant handle it so i swapped them out and put my stocks back on 3rd time i got at 15mph NOx 1533 and at 25mph 1551 so it was closing time and i ask his opinion on what it could be he said my car is running a lil cold so he suggested i replace my thermostat so im in the processed of changing it in the morning and changing my oil what could it be i have a new cat stock headers one new downstream o2 my ignition timing is 13btdc on everything else i pass but the emission test i faill a lil help would be appreciative