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| Compatible EGR Solenoid FOUND (Page 3/3) |
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Additivewalnut
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APR 15, 10:43 AM
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| quote | Originally posted by Patrick:
You appear to have missed the drama. Catch up here... the Ogre
I defended Ogre plenty of times in the past when people got pissed off at his gruff manner... but he unfortunately crossed the line big time. Whether it was due to the onset of dementia or another stroke or whatever... he's no longer welcome here.
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Whoa. That was.... an unpleasant read. I can't believe that happened last August. I swear I had him telling me that my Grand Am swap was a **** idea fairly recently. Hope he's doing well regardless. Dude was an ass but everyone deserves to be happy.
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MarkS
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APR 15, 02:30 PM
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| quote | Originally posted by Additivewalnut:
Whoa. That was.... an unpleasant read. I can't believe that happened last August. I swear I had him telling me that my Grand Am swap was a **** idea fairly recently. Hope he's doing well regardless. Dude was an ass but everyone deserves to be happy. |
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Well, I'm sure he came up with the Ogre handle & Avatar himself, no? (Or maybe an ex-wife haha!) kinda like a shot across the bow.
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82-T/A [At Work]
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NOV 12, 02:06 PM
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| quote | Originally posted by Mickey_Moose:
If the EGR is disabled in the EPROM wouldn't it just use the EGR off fuel map? |
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I can't say... I've never disabled the EGR in any of my builds. My assumption is that there is only one fuel map... and things like the EGR or other sensors either increase or decrease other variables as it goes through the loop.
For my V6, I'm looking to install the FAST EZ-EFI 2.0 system... one of these days. We're working on my daughter's cars while she's still in school. I have her for 1.5 more years. Then I'll work on my car. But with the FAST system, it doesn't really care or know whether or not you have an EGR. The goal isn't to eliminate emissions or anything like that, but the newer system will just operate better, and more efficiently... so it doesn't really need the EGR. I'll probably still have it installed, though it'll never be activated.
One thing I do find interesting though... the 84-86 4cyl Fieros don't have any kind of vacuum solenoid. Merely... the EGR engages and disengages based on vacuum. So, it expects it all the time. What specifically does the vacuum regulator do on the V6 Fiero that it needs a vacuum regulator? Why couldn't they have merely attached the EGR in a similar fashion to how the 4 cyls were? And... would it not function the same?
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Raydar
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NOV 13, 12:27 AM
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| quote | Originally posted by 82-T/A [At Work]:
I can't say... I've never disabled the EGR in any of my builds. My assumption is that there is only one fuel map... and things like the EGR or other sensors either increase or decrease other variables as it goes through the loop.
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There are indeed two fuel tables - and two ignition timing tables. One set for "EGR ON" and one set for "EGR OFF".
The "EGR ON" runs much leaner, and with much more spark advance.
The recycled exhaust gas is basically inert, and helps to cool what would otherwise be a "way too lean, and way too advanced" combustion cycle. Way simplistic, but that's the nuts and bolts of it.
People who jumper the EGR solenoid to trick the ECM can run the risk of burning pistons. It doesn't always happen, but it absolutely can.
When I was at the Fiero Factory, I saw several engines that had holes in the pistons in cylinders 2 and 3. Seemed to be the pattern. (I'm not saying that's why, but it would figure.)
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One thing I do find interesting though... the 84-86 4cyl Fieros don't have any kind of vacuum solenoid. Merely... the EGR engages and disengages based on vacuum. So, it expects it all the time. What specifically does the vacuum regulator do on the V6 Fiero that it needs a vacuum regulator? Why couldn't they have merely attached the EGR in a similar fashion to how the 4 cyls were? And... would it not function the same? |
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The EGR on the V6 and the 4 cylinder (even the 87-88) run off of "ported vacuum". The V6 solenoid helps to control it more precisely, and also offers diagnostics, in the form of the dreaded "Code 32". I have no idea why they didn't think diagnostics were necessary on the Duke.
When I thought I had a bad solenoid, I thought about just running the EGR valve straight to the throttle body vacuum port, in order to pass emissions.
As luck would have it, the problem ended up being elsewhere. (I had a ported throttle body, and it affected the amount of vacuum available at part throttle. IIRC, I had to swap a stock throttle body back onto the engine, to "see" enough vacuum to make the EGR work.) This is from memory. And I've slept since then.
Another little bit of probably useless trivia...
When the EGR is "moderated", by the solenoid, the vacuum is just vented to the atmosphere through the fitting on the end of the EGR solenoid - the one that connects to the tube from the firewall. If you block that fitting, then full ported vacuum is applied to the EGR valve, regardless of what the solenoid is doing.[This message has been edited by Raydar (edited 11-13-2025).]
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