First post, thx for having me. Can anybody point me in the right direction to locate the DPFE on my 351W in a 93 F150? I know what the part looks like thx to the AutoZone website, but I can't find the blasted thing.

 

For a 1993 F-150 with a 5.8L, look for the DPFE on the passengers seat, sitting there in its box with no place to go

Your truck doesn't have a DPFE, it has a simple EGR position sensor, its mounted onto the end of the EGR valve. It has one connector on it.

I see some parts places have screwed up their look-up tables, and have put a OBD-II systems DFPE as being on older year vehicles with EEC-IV!

A DFPE is a pressure sensor that has two hose inputs, the hose inputs come from each side of a special tube in series with the EGR flow. The tube has an orifice, a restriction in it, so flow rate equals a pressure drop across the orifice. The DPFE measures the pressure drop, which the EEC-V OBD-II compatible processor converts to EGR flow rate data.

In contrast, a EGR position sensor just has a pin that presses into the EGR valve, and reports back to EEC-IV how far open/closed the EGR valve is at that moment.