Where is the egr valve on your 2003 ford ranger 4.0?
right rear corner of the intake manifold near the firewall
Ford did not start putting egr valves on a diesel engine until late build 2003 when the 6.0l engine came out. Even the early build 2003 ford diesel trucks that still had the 7.3l did not have an egr valve. the only thing close on a 7.3l is the ebp sensor. and that measures the backpressure in the exhuast.
I've been researching this as well, and have found others saying that some of these trucks aren't equiped with an EGR system. A truck without the egr will have a capped off spot right next to the Idle Air Control valve on the top-drivers side of the intake manifold. The EGR valve goes in this capped hole. My truck has the capped hole and no EGR.