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3.0L Ford engine 1993. Failed smog(NOx). Went to change EGR valve but there isn't one. Just a metal plate bolted to intake manifold as like a cover.?
You're on the right track. Ford used about 3 diff types, look for a large silver disc with green wire on top mounted on rusted out iron bypass pipe fender area next to purge. Has vac diaphragm inside and probably one you have. Also ensure convertor is hot like it supposed to be while running and make sure you have no vac leaks. See how badly you failed as well, if egr doesn't help and not off by much, you can get a higher efficiency convertor than stock which is what some do to get around it after trying all other remedies.
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