Egr Solenoid Rebuilding? (Page 7/10)
Kitskaboodle SEP 26, 03:55 PM
Thanks for the input.
I don’t think it’s the ECM as I already put in another one from an 85 SE V6 but there was no change. Also, I already verified that the lower two pin outs on the 4 pin connector are supplying 12+ volts to the solenoid when revving the engine to 1800 or more rpm’s.

Kit
skywurz SEP 26, 04:52 PM
I think Technically you can test how well the disk is sealing by removing the solenoid, capping the bottom tube with 2 outlets (for egr and pressure sensor) then blowing into the top tube.(The one that comes from the intake) If its sealing well you should get little to no leak going through the back tube (to the air filter). If it does leak you need to make sure there is no corrosion on the tube or burrs that the disk sits against. You also need to make sure you have oriented your spring correctly. (it should be in the cap side not the body side) you should have whiteness marks.
Kitskaboodle SEP 26, 08:05 PM
Since I was curious about the other egr solenoid from my 86 GT, I decided to take it apart also. Here is a pic of it filleted and the other showing the ohm reading of the coil winding. Does this reading seem correct?
Kit
skywurz SEP 26, 09:18 PM
looks good now apply 12v with it open like that and see if that metal disk will stick where its suppose to.
Kitskaboodle SEP 26, 11:55 PM
Sorry, I was a little to gung-ho and already put it all back together tonight. I did do the test you asked about though. I plugged the nipple that goes to the egr valve and sensor, then blew into the other nipple (toward the fresh air filter) and it seemed to hold tight. (No air leaking through)

On another note, since the original egr solenoid is back on the 85 and it doesn’t seem to be working on its own, I’m going to take it back off in the next day or two, take it apart and do the metal plate / applying 12 volts “suck off” test you are asking me to do.
Stay tuned… (and thanks for all your help!)
Kit
Kitskaboodle SEP 27, 11:58 PM
Ok, I did 3 more tests tonight on my original 85 GT egr solenoid:

Test #1 / I tested the ohm reading on the coil winding by probing the two lower pins on the egr solenoid 4 pin connector. (it was 95.8 ohms)

Test #2 / After taking the egr solenoid all apart, I held the coil winding assembly & its housing in a vertical position, (intake nipple straight up & the other end that contacts the spring and plate facing downward) then, while holding the
metal block off plate on the tip of my finger, I applied 12 volts to the solenoid. It pulled up the metal plate very strongly to block off the hole.

Test #3 / I reassembled the spring, plate & plastic end cap, (the one with twin tubes) I then applied 12 volts to the solenoid & tried to blow air into the egr solenoid through the intake nipple (incoming fresh air side) and could NOT
blow through until I disconnected the 12 volt power.

Kit

[This message has been edited by Kitskaboodle (edited 09-28-2022).]

skywurz SEP 28, 12:33 PM
That sounds promising. I cant think of any other reasons this should not work.
Kitskaboodle SEP 28, 09:57 PM
Ok, I did the same test again this evening but after fully reassembling the egr solenoid.
I applied 12 volts to the lower two pins of the egr solenoid and then tried to blow air from the fresh air intake side toward the other end of the egr solenoid. When I applied 12 volts, I was no longer able to blow air through the twin port tubes. It was “sealing “ (or blocking) the air very good.
Next step is to install the egr solenoid back on the car and see if it now works as it should.
Stay tuned! 😀
Kit
Kitskaboodle OCT 01, 03:03 PM
Ok, I put my egr solenoid back on my 85 GT, teed in my vacuum gauge to the egr valve, warmed up the engine, revved it to 1900-2000 rpm or so and noticed I’m still only getting 2.5 hg of vacuum at the egr valve. As you know, I have already verified that the egr solenoid is opening on command after applying 12 volts. To repeat a previous test, when I capped the intake side (fresh air side) of the egr solenoid, the vacuum got better. (4 to 4.5 hg)

At this point I’m still baffled by the low vacuum at the egr valve. What I would like is for someone to verify what vacuum they get at their egr valve when its open.
Anyone?
Thanks Kit
Notorio OCT 07, 03:02 PM
Kit, did you confirm that the ECM is sending 12v to the solenoid?

This afternoon I should be able to check my vacuum at the EGR valve and report in.