Hello and thanks for using Just Answer.I will try my best to help you with your question.
Your engine does not have a PFE or a DPFE. It only has the EGR valve and the EGR position sensor mounted on top of the valve. It also has an EVR that controls the vacuum to the EGR to regulate the amount of vacuum the ECU (Engine Computer) sends to open it to allow exhaust gases back into the intake manifold. Below is the Ford Shop Manual diagram of your system. It is a little simplified.
Below is also the Ford description of how the system works.
The EVP EGR Valve (Figure 6) is required in EEC systems where EGR flow is controlled according to Powertrain Control Module (PCM) demands by means of an EGR Valve Position (EVP) sensor attached to the valve.
The valve is operated by a vacuum signal from the EGR Vacuum Regulator (EVR) Solenoid (9J459) which actuates the valve diaphragm.
As supply vacuum overcomes the spring load, the diaphragm is actuated. This lifts the pintle off its seat allowing exhaust gas to recirculate (flow). The amount of flow is proportional to the pintle position. The EVP sensor mounted on the valve sends an electrical signal of its position to the PCM (12A650).
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It helps when you are around these vehicles all the time. Hands on is what helps with the knowledge.
Sorry its been a while. Anyway, the new EGR valve seems to be working now but my truck idles at around 500 rpms which is too low to maintain volts and sometimes cuts truck off. Also, sometimes esp when hot it wants to surge a little up and down until it gets to 2000 rpm. Also sometimes seems to bog at takeoff like its getting too much fuel. no ck eng light. Any thoughts?
Clean the throttle body out with a throttle body cleaner.
Then adjust you idle at the idle stop on the side of the throttle body. Adjust it a little then turn the truck off and restart it. Check the rpms, they should be about 800 rpm when it is set right.
ok. recently replaced IAC. so maybe i should fork out 50 for tps. Sorry i have so many questions, I know you do this to make money. Im poor and rely on my truck and cant afford 70 an hr to take it antwhere. thanks. but...i thought tps would through a code. i will clean it anyway though. let u know..thank you
At the TP sensor, you will have 3 wires.
Turn the key to on and measure the voltage at the GRAY/RED striped wire with the connector still plugged into the TP sensor. It should read .9 volts. If it is higher or lower, then adjust the idle stop screw till the sensor voltage is .9 volts.