Once again I am back here asking for help. I give you a bit of history about my car. 1995 Subaru Legacy 2.2 ej22 with 145000 miles I got it for free from my sister a year ago . Right after I got it I had to replace a MAF sensor and rerun all new brake lines. a new battery. and its been great until about 4 months ago I got a 0400 egr cel . Being that I am a noobie with no Subaru experience I was lost . But since I consider myself a self sufficient individual I refused to bow down so I got a Haynes and Chilton manual , a OBD2 reader and with the help of you guys I learnes alot about my ej22 and Subaru. So here gos on the 4th of july my alternator died on me so I was able to get one from a buddies j-yard there was a soob there that had met it maker thanks to a semi-truck (driver side was no more) I was able to gather a lot of parts from the vehicle including a EGR ,BPT, IAC, PCV stem,and all the MAP stuff. As I said it been running with a 0400 for a while so I figured that now was the time to fix it with the help of the forum I changed the EGR and BPT I noticed the the vacuum lines and components were pretty fouled with carbon so I decided to do a sea foam treatment, 1/3 in oil 1/3 in gas 1/3 into manifold. drove about 50 miles and then changed the oil. now I have a 0106 cel I tried to search for the answer but I am lost. I did the troubleshooting the Haynes manual recommended .I got 4.8 volts on the ref line and when I check the solenoid I got 39 ohms well within range.
But when I backed probed the signal line I got 4.5 volts on idle but when I open up the throttle the voltage did not go down as it should and when i took the vacuum line of the solenoid i got vacuum coming in but nothing going out. I would have changed the solenoid with the one I got from the yard but they are different.(My solenoid has 2 lines on it and the yard one has 1 line and a filter) Can I remove the filter and use it anyway. I just need to know how to go about tracing the problem.