Egr Solenoid Rebuilding? (Page 2/10)
skywurz AUG 19, 10:54 AM
They were on the lid with the vacuum ports. I discovered them by accident when i was getting poor flow through the disassembled solenoid ports and poked a tool in there to try to clear the ports. They obviously are to prevent things getting sucked into the solenoid but idk how you would clean them.
Kitskaboodle AUG 19, 09:32 PM
Ok, you are referring to the twin port tubes. Mine are clear.
Thanks for reminder to make sure they are clear.
Kit
Kitskaboodle AUG 20, 10:47 PM
Ok, I cleaned up the solenoid, re-soldered the leads from the coil winding to the connector ends and then put it all back together.
Then, I ran 12 volts to the solenoid (per a video I saw on YouTube (Matt) but mine seems to be dead. (No clicking)
Looks like mine is toast.
Kit
skywurz AUG 20, 11:32 PM
Honest that thing is a PITA to bench test. It doesn't click. You have to run a vacuum on it and then trigger it.
Kitskaboodle AUG 22, 02:49 PM
Ok, I tested it again with my MightyMite vacuum tester and it’s still showing 2.5 hg or less at full operating temperature at 2500 or so rpm.
According to the booklet that came with the test gauge, there should be a minimum of 5 hg or greater when fully warm.
Is anyone able to do a vacuum test on their V6 Fiero to see what vacuum reading you get while teed in to the egr valve vacuum line?
I would like to see what vacuum reading you are getting.
As an fyi I swapped out the egr solenoid from my other Fiero and it’s still giving the 2.5 hg vacuum reading as my old one and this Fiero passed smog a few months ago so I know that egr solenoid is good.
I’m getting confused. Kit
P.S. I verified that there IS 12 volts getting to the egr solenoid. Also, the hard plastic vacuum lines look to be ok although it’s hard to verify it because most of it is under the plenum.

[This message has been edited by Kitskaboodle (edited 08-22-2022).]

Mike in Sydney AUG 22, 07:02 PM

quote
Originally posted by Kitskaboodle:

.... Also, the hard plastic vacuum lines look to be ok although it’s hard to verify it because most of it is under the plenum.




Try isolating the vacuum lines under the plenum by locating both end of each line. Block off one end with a cap of the appropriate size and use the Mity-Vac to see if it will hold a vacuum. You should be able to tell if the lines are good using this method.
Kitskaboodle AUG 22, 09:56 PM
Good idea. Thanks fir that suggestion,
I was also thinking of doing the exact opposite. (for a different reason) I thought about blowing air through one end to see if one of the lines is blocked.

Also, I’m very interested to see what your vacuum gauge says when at full operating temp.

By the way, I contacted the FieroStore yesterday and asked them to consider offering the Fiero V6 egr solenoid. For different reasons the answer was no.
Kit
skywurz AUG 22, 10:59 PM

quote
Originally posted by Kitskaboodle:

Ok, I tested it again with my MightyMite vacuum tester and it’s still showing 2.5 hg or less at full operating temperature at 2500 or so rpm.
According to the booklet that came with the test gauge, there should be a minimum of 5 hg or greater when fully warm.
Is anyone able to do a vacuum test on their V6 Fiero to see what vacuum reading you get while teed in to the egr valve vacuum line?
I would like to see what vacuum reading you are getting.
As an fyi I swapped out the egr solenoid from my other Fiero and it’s still giving the 2.5 hg vacuum reading as my old one and this Fiero passed smog a few months ago so I know that egr solenoid is good.
I’m getting confused. Kit
P.S. I verified that there IS 12 volts getting to the egr solenoid. Also, the hard plastic vacuum lines look to be ok although it’s hard to verify it because most of it is under the plenum.




This sounds like you have a vacuum leak. I just went through this with CA smog in June. Test the vac from the intake to the solenoid then test it after then test it at the egr. Somewhere in there you will find low vac. What i typically do is pull the intake line put my thumb over it and run some vacuum from the solenoid side (just the vacuum tube) then i do that same thing the egr side.
armos AUG 26, 06:50 PM

quote
Originally posted by Kitskaboodle:

Ok, I tested it again with my MightyMite vacuum tester and it’s still showing 2.5 hg or less at full operating temperature at 2500 or so rpm.
According to the booklet that came with the test gauge, there should be a minimum of 5 hg or greater when fully warm.
Is anyone able to do a vacuum test on their V6 Fiero to see what vacuum reading you get while teed in to the egr valve vacuum line?
I would like to see what vacuum reading you are getting.
As an fyi I swapped out the egr solenoid from my other Fiero and it’s still giving the 2.5 hg vacuum reading as my old one and this Fiero passed smog a few months ago so I know that egr solenoid is good.
I’m getting confused. Kit
P.S. I verified that there IS 12 volts getting to the egr solenoid. Also, the hard plastic vacuum lines look to be ok although it’s hard to verify it because most of it is under the plenum.



2500rpm in gear or just at idle?
Do you know if the 12V you see is actually meant to *activate* the solenoid, or is it just a power supply and not a switch? I don't know it's wiring scheme.

I might have misunderstood your test, but if you're relying on the car to activate the solenoid then it has to be in gear driving down the road. The ECM doesn't activate the EGR solenoid at idle.
It also has to warm up to some minimum coolant temperature and meet some other criteria (programmed in the chip). A leisurely cruise will allow EGR, heavy load or idling will not.
I used to get the warning light within a few minutes of driving so the temp threshold isn't very high.

Also, have you checked that the EGR valve holds vacuum if you lift the valve and then cover the port? New parts aren't always good.
skywurz AUG 26, 07:26 PM
My understanding is. The EGR should open when you go from idle to 2500 in park or neutral. When you are under loads at freeway speeds, The solenoid should trip and waste the vacuum causing the egr to close.

[This message has been edited by skywurz (edited 08-26-2022).]