emission

I bought a 2003 Mach 1 with 13k mikes on it. It had a supercharger put on it by previous owner who worked for Ford. I had it emissions tested yesterday, and it failed due to high nox. I’m wondering what the possibilities for cause could be. I don’t pretend to know anything about engines. My...

I have a 302 Ford block code D90E-6015-E3A I am rebuilding. I know the 302 is a 1979 to 1984 period block. I cannot figure out what the holes in the back passenger side of the block are for. 1 hole is in the rear main and it aligns to a hole just below the deck on passenger side rear of engine...

Hello I have a rebuilt motor with non smog heads. Previous owner assembled fuel injection intake and it was running rich and gave up. My question in order to pass emissions do I need the smog manifold hooked up to pass? The car has an x pipe but most emissions items unhooked. So if I hook the...

I'm hoping someone can point me in the right direction. I've searched the forums but have not seen a similar problem. My '85 GT has had an '88 5.0 HO swapped in (not by me). I took my '85 GT to get an emission inspection. I live in Colorado and for an '85 it's a dynamometer test to simulate...