My '94 Ranger didn't pass emissions inspection because they said it's supposed to have an Exhaust Gas Recirculation System but my engine just didn't have that component on it anywhere. They said it's probably because a previous owner must have changed out the engine to a different year and I didn't know about it, but they couldn't identify the engine because there were no longer any stickers on the underhood frame to identify it.
Is there a code or stamp anywhere on the engine that I can use to positively identify the engine and determine what emissions standards apply?