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| Egr Solenoid Rebuilding? (Page 8/10) |
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Notorio
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OCT 07, 06:52 PM
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Kit, I tried, but hardly saw any deflection on my new gauge. Does your gauge have finer gradation than this one? I doubt if I could reliably tell the difference between 2.5 and 4 in Hg. My finger over the tube DOES detect a difference in vacuum between idling and 2000 rpm.
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Notorio
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OCT 07, 07:19 PM
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Eureka! I loathe my PDF service manual because it is so hard to find anything but this time I prevailed. On pg 625, section 6E3-A-43 there is a trouble-shooting guide for Code 32. I don't understand why Your or why My ECMs are not setting this code. The guide says that the vacuum to the EGR must be above 7 inches of Hg at 2000 rpm. 
I can copy and send you these pages if you would like.
p.s. we also need to review section 6E3-C7, pages 692-696, which has the entire EGR trouble-shooting procedure![This message has been edited by Notorio (edited 10-07-2022).]
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Notorio
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OCT 07, 07:37 PM
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Never mind, the 7" appears to pertain to Code 32. Looking through the second section it looks like it just has to be above 2 inches. I'm posting just one pg of the section so that everyone can see that here:
 [This message has been edited by Notorio (edited 10-07-2022).]
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ericjon262
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OCT 07, 08:06 PM
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| quote | Originally posted by Kitskaboodle:
Ok, per BuddyCraigs thread, I did 3 more tests this evening:
All tests below were done with my ORIGINAL egr solenoid (that I had on my 85 GT) on my workbench and fully put back together. (that I failed smog with) To remind you, I took it all apart to clean, inspect, repair and then put it all back together. Since, after I put it I was still not getting vacuum synthetic egr valve, I decided to put on the egr solenoid from my 86 GT since I know it is good.
Anyways, that one is still on my 85 GT.
These tests are to show if my original one is ok or not ok. (As I mentioned previously, I took it all apart but it looked mostly ok)
Ok, here we go.
Test #1 / Tested continuity at vacuum sensor (top two pins) and it registered a flat 0.0 ohms (i.e. OPEN)
Test # 2 / disconnected short vacuum hose that goes from egr solenoid nipple to vacuum sensor, then hooked up vacuum pump to hose that goes to the vacuum sensor, then while reading the ohmmeter readings from the top two pins, I applied about 5 hg of vacuum. The ohm reading went from 0.0 to about 0.6. When I disconnected vacuum gauge, it went back to 0.0 (of course)
Test # 3 / I probed the bottom two pins on the egr solenoid and it measured 95.0 ohms.
These figures seem to be inline with BuddyCraigs findings. I think my ohmmeter is a little better (and probably more accurate) I have an Innova model 3320.
Thanks, Kit |
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0.0 ohms is a short, not an open.
Edit: somehow missed this was 2 pages and already mentioned...
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"I am not what you so glibly call to be a civilized man. I have broken with society for reasons which I alone am able to appreciate. I am therefore not subject to it's stupid laws, and I ask you to never allude to them in my presence again."
I invited Lou Dias to trash me in my own thread, he refused. sorry. if he trashes your thread going after me. I tried.
No pushrod 60V6 Fiero has been faster according to the 1/4 mile list. [This message has been edited by ericjon262 (edited 10-07-2022).]
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Patrick
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OCT 07, 09:49 PM
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| quote | Originally posted by Notorio:
I tried, but hardly saw any deflection on my new gauge. Does your gauge have finer gradation than this one? I doubt if I could reliably tell the difference between 2.5 and 4 in Hg.
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I dug out my vacuum gauges which I haven't used... forever, and the graduation on them is a little finer than your gauge. With a 180° sweep, your gauge goes up to about 42 inHg. With a 180° sweep, my vacuum gauge goes to 26 inHg, and the built in gauge on my Mityvac II goes to 20 inHg with the same 180° sweep. So the gauge on the Mityvac II would appear to be the most accurate. However, I'm not 100% sure it would work when measuring vacuum from another source other than itself.*
I'll connect them to the 2.8 (with a fully functional EGR system) in my Formula tomorrow and report what readings I get.
[EDIT] I went back and re-read some posts, and came across this...
| quote | Originally posted by Kitskaboodle:
I took off just the hose/line that goes out from the solenoid “T” junction nipple, (and goes to the egr valve) hooked up a separate vacuum hose to this nipple and ran the other end to my MightyVac gauge, revved the engine to about 1800-2000 rpm but got almost no vacuum.
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* Kit, is your "MightyVac gauge" the same as what's pictured below (which is the same as my Mityvac II)?
 [This message has been edited by Patrick (edited 10-07-2022).]
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Kitskaboodle
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OCT 10, 08:16 PM
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This is my vacuum gauge. (see pics)
Also, look at the open book pic. On the right side, number 3 it says 5 hg minimum in regard to required vacuum at the egr valve.
On a different note, thanks Notorio for the service manual pic. I did not notice that it says you are supposed to check the egr valve vacuum in DRIVE, press the brakes and then briefly rev it to 1800 rpm. (both of my Fiero’s are auto’s) Maybe I’m checking vacuum wrong???
Kit
  [img]https://images.fiero.nl/userimages/Kitskaboodle/E57 939ED-73C5-4F27-BE69-840C4BDD7C34.jpeg[/img][This message has been edited by Kitskaboodle (edited 10-10-2022).]
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Kitskaboodle
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OCT 10, 08:22 PM
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This is my vacuum gauge. (see pics)
Also, look at the open book pic. On the right side, number 3 it says 5 hg minimum in regard to required vacuum at the egr valve.
On a different note, thank Notorio for the service manual pic. I did not notice that it says you are supposed to check the egr valve vacuum in DRIVE, press the brakes and then briefly rev it to 1800 rpm. (both of my Fiero’s are auto’s) Maybe I’m checking vacuum wrong???
Kit
[img]https://images.fiero.nl/userimages/Kitskaboodle/E57 939ED-73C5-4F27-BE69-840C4BDD7C34.jpeg[/img]
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Patrick
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OCT 14, 09:00 PM
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| quote | Originally posted by Kitskaboodle:
I took off just the hose/line that goes out from the solenoid “T” junction nipple, (and goes to the egr valve) hooked up a separate vacuum hose to this nipple and ran the other end to my MightyVac gauge, revved the engine to about 1800-2000 rpm but got almost no vacuum.
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I've just come in after "T"ing my Mityvac II into the EGR vacuum line (at the valve) of my Formula. At idle, there was no discernible vacuum, as was expected. When I revved the engine (and the EGR solenoid activated), the vacuum went to a steady 2 inHg (on a scale that goes up to 30 inHg).
However...
Even though I was using my most "accurate" vacuum gauge (it has the finest graduation of the three gauges I own), I don't know how much credence can be given to my (or any of our) readings. IMO, these gauges are far too basic/inaccurate to be measuring such a low vacuum with any precision.
| quote | Originally posted by Kitskaboodle:
I did a test on my 85 GT today. I put a vacuum gauge in-line with the hose that goes to the egr valve, warmed up the engine, revved it to 2500-3000 rpm and the vacuum gauge barely read 2.5 hg. I heard the minimum is at least 5 hg. Despite no codes, I think my egr solenoid is not allowing vacuum to get to the egr valve.
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Did you put your fingers on the underside of the EGR valve to see if it was moving/opening when you revved the engine?
My EGR valve was opening with a supposed vacuum reading of 2 inHg. It may be that you've been concerned about your "low" reading of 2.5 inHg for nothing.  [This message has been edited by Patrick (edited 10-14-2022).]
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Notorio
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OCT 15, 12:15 AM
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| quote | Originally posted by Patrick:
Even though I was using my most "accurate" vacuum gauge (it has the finest graduation of the three gauges I own), I don't know how much credence can be given to my (or any of our) readings. IMO, these gauges are far too basic/inaccurate to be measuring such a low vacuum with any precision.
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I second that conclusion.
| quote | Originally posted by Patrick:
Did you put your fingers on the underside of the EGR valve to see if it was moving/opening when you revved the engine?
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I'd like to point out that some of us have the 'new style' EGR. The genius who designed this made it impossible to SEE if the valve is actually working. If anyone knows a way to SEE if it is working, please let us know.
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Patrick
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OCT 15, 01:04 AM
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| quote | Originally posted by Notorio:
I'd like to point out that some of us have the 'new style' EGR. The genius who designed this made it impossible to SEE if the valve is actually working. If anyone knows a way to SEE if it is working, please let us know.
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Interesting. Now keep in mind, I didn't "see" my EGR valve working either... I felt it with my fingers.
I notice a small hole on the underside of the housing in your image. Could something non-pointy be inserted into that hole and gently positioned up against the diaphragm to feel for movement?[This message has been edited by Patrick (edited 10-15-2022).]
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