Truck is a 1994 ford ranger 2.3l manual. It has about 200k miles. And uses the EGR position valve sensor with the resistor on top (I guess theres two kinds)

ok I am trying to fix a code 32 which is a out of range EGR valve. So i first checked to see if I had vacuum at the EGR and didnt. So I followed the hose to the EGR position sensor. Now When I disconnected the hoses from their it was wierd. I had perfect vacuum going to the EGR position sensor but as soon as the hose was connected to the sensor there was no pressure going from the sensor to the EGR. So I figured the EGR valve sensor must be leaking, bought another one, and put it in and still there is no pressure going to the EGR valve. What could cause this. Also is the power going into the EGR valve position sensor suppossed to control the sensor? What makes the sensor open and close the egr valve. Please help I need to pass smog. Thanks

 

come on nobody has any info that can help

 

I don't know the 94 system, but the older ones had a vacuum valve system that applied some vacuum to open the EGR, and bled off vacuum to close it. The amount of vacuum adjusted the EGR valve opening, and the ECM would just hold the valve where it wanted, after applying some vacuum, and reading the EGR position sensor. The vacuum was applied and released by two solenoid valves, on the pass side under a plastic cover. One was the vent, to release the vacuum, and the other was the apply. if you have them. I haven't memorized the codes, but an out of range means, I believe, that the voltage returned to the ECM is not what it expects from a good position sensor. If you have loose wires or bad connections you may not be getting good readings to the ECM. You should be able to test the voltage by applying vacuum to the EGR diaphragm while you are reading the position sensor output.
tom

 

Well mine is sort of like that but my egr position sensor is right before the EGR valve. From the intake manifold the hose goes to the EGR position sensor then comes out from that into the EGR valve. I think ive figured it out though. I think its just b/c my damn truck wont get to normal temp so it stays in closed loop. When its doing the KOER test and the temp isnt at normal would it not use the EGR valve and throw that code.

 

Well, given gas prices, I'd be putting a new thermostat on as quickly as I could. Then you'd be getting up to temp, and a lot sooner. Significantly less fuel consumed. Remember, Ford wanted to get these trucks the best mpg they could so as to compete with bowtie and horny critter, and help their CAFE numbers. They'd not put an extra nail or screw on these when they made them. They have teams trying to wring the last lock washer out of production costs... a thermostat is there for a reason.
tom