The orifice you're likely referring to on a Ford Windstar is related to the
EGR (Exhaust Gas Recirculation) system. There isn't a single, easily identifiable "orifice" like a hole you can point to. The EGR system uses a valve and passages within the intake manifold and cylinder head to control the flow of exhaust gas back into the engine. These passages and the valve itself contain precisely sized openings that act as orifices.
Therefore, there's no single location to pinpoint. The relevant parts are internal to the engine and require mechanical knowledge and specialized tools to access and inspect. If you're experiencing a problem, you'll need a mechanic or a detailed repair manual to diagnose the issue.
