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Trouble passing Smog?...Nitrogen Levels to high
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[QUOTE]Originally posted by 90FoX: [QB] ok well i have a 1990 5.0 and it has about 155,000 miles on it...i have to smog it for registration. it has bbk equal length headers and a high flow bassani x pipe with dynomax bullets... the smog tech told me that the new smog laws require them to check nitrogen levels and that the old smog laws didnt require that. :confused: and my car is at like 900-1200 and the max is "500" something around there. anyways that leads me to this problem. I CANT PASS lol.. the x pipe has cats and they are brand new, less than a year.. the exhuast does smell like the car is running fat(rich)...any suggestions on what i can do to get my car the way is used to be without having to throw on the old h pipe with 4 cats. - the smog tech told me that its not passing because the car needs to have 4 cats... im guessing that my car isnt running right. anyone encounter this probelm.. :confused: maybe my 02 sensors are bad and are tricking my ECU to thinking that the engine is running lean. should i try to clean my mass air sensor? pull the codes? any help would be great because i dont want to just pass smog with 4 cats and still have my cars tune way off. thanks :patriot: PS- i have not noticed a drop in gas milage..i have 3.73's and am getting about 215-230 miles on a full tank [/QB][/QUOTE]
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