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| EGR Valve on 2.8 V6 question (Page 1/5) |
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ZaraSpOOk
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DEC 11, 11:04 PM
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I am considering going without it. I do not need to license my car each year since it is registered as a classic, so even if some day they bring back emissions testing, It will not have to go through testing.
And when you consider the recent forest fires out west, the emissions given off by my car which is only driven about 2 or 3 thousand miles is insignificant.
As you can see from the picture, it wasn't doing anything anyway, both whatever that black line did, it was broken, and the EGR connection to the intake manifold was broken. Looking at the input to the manifold it is all clogged up, so no air gets in anyway.
If I do go without I should probably make sure the manifold connection is closed rather than depend on the clog to stay that way. The car seems to run fine without any negative consequences.
Has anybody else done this? What was the result?
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Gall757
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DEC 12, 03:39 PM
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ZaraSpOOk
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DEC 12, 04:40 PM
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Thanks for the link, but I am wondering the value of the info, the ECM does not control or monitor the EGR
and I don't see the value in cutting out the vacuum to the EGR if it isn't installed or isn't working
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wwcvel
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DEC 13, 01:29 AM
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But the car’s computer does control the EGR and throws a Check Engine light when it isn’t working. There is (supposed to be) a solenoid on the other/passenger side of the Engine that controls when the EGR opens and closes using vacuum lines. There is a big hard vacuum line that traverses the plenum from the solenoid to the EGR valve. The ECU controls this solenoid, so it is important to modify your ECU chip to keep it from throwing a check engine light and so your car runs better on the highway.
I think just unplugging the solenoid stops the CEL (?) BUT the ECU still runs the engine like the EGR is working and there are issues that result from that, especially with highway driving.
Most EGR solenoids are gummed up, the plastic is crumbling from engine heat, and the internals are all oxidized from weather. As you’ve already seen, most EGR valves are also in terrible shape. Valves are cheap but It is literally impossible to buy new EGR solenoids in 2020. There was a cruel joke of an eBay listing last year that had a NOS solenoid listed for like $600.
From what I’ve read on the forum the only viable long term solutions to fixing your EGR now is to get lucky and find a low mile solenoid and deoxidize and weatherproof it,
OR
swap in a newer 7730 ECU, have a custom chip made that runs the 2.8, get a new custom made EGR valve adapter plate (which from what I’ve read just had its last production run) and use an electronic EGR valve in place of the old vacuum valve.
Sure, delete the EGR but do it right and get the modified ECU chip.
Also, It’s far more damaging to the environment to throw another Fiero in a crusher and build a new car (do you know how much permanent environmental damage occurs mining crap for Tesla batteries?), than keeping a Fiero on the road without an EGR.[This message has been edited by wwcvel (edited 12-13-2020).]
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fierofool
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DEC 14, 09:20 AM
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| quote | Originally posted by wwcvel:
........................snip..................
OR
swap in a newer 7730 ECU, have a custom chip made that runs the 2.8, get a new custom made EGR valve adapter plate (which from what I’ve read just had its last production run) and use an electronic EGR valve in place of the old vacuum valve.
Sure, delete the EGR but do it right and get the modified ECU chip.
......................snip.........................
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We still have 9 Digital EGR Adapter Kits on hand. We have reduced the number being produced with each new production run due to the reduced demand.
http://gafieroclub.org/bbs/index.php?topic=733.0[This message has been edited by fierofool (edited 12-14-2020).]
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ZaraSpOOk
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DEC 14, 05:24 PM
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| quote | Originally posted by wwcvel:
But the car’s computer does control the EGR and throws a Check Engine light when it isn’t working.
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yes, the ECM does tell the EGR when to open and close, but beyond that no, It has no way of knowing whether the EGR actually opens and closes,.
How do I know that?
the service manual says so
plus, if you look at the pic I posted, the vacuum line is broke, and the tube from the EGR was broke as well
PLUS, the opening in the manifold was all gummed up with carbon
and no check engine light
that's because the ECM doesn't monitor it
I closed the opening to the manifold with an aluminum plate
as far as the solenoid is concerned, the vacuum line is closed as well where it is broken, the ECM can "tell" the EGR to open and close all day and it isn't gonna know what it is doing
BTW, it is closed at idle, open at pretty much all other times
I'll report back if there is any trouble with what I have done
but thanks for everyone's response[This message has been edited by ZaraSpOOk (edited 12-14-2020).]
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fierofool
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DEC 14, 07:51 PM
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I have had broken or disconnected EGR vacuum lines and holes in the EGR valve diaphragm. Each one triggered the Check Engine Light.
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PhatMax
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DEC 15, 12:49 PM
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In also interested in your findings...
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WKDFIRO
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DEC 15, 06:15 PM
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I had my EGR tube blocked at the manifold (with the aluminum from a soda can) and grounded out the EGR solenoid on my 85 GT for years.
No problems.
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ZaraSpOOk
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DEC 16, 05:28 PM
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| quote | Originally posted by fierofool:
I have had broken or disconnected EGR vacuum lines and holes in the EGR valve diaphragm. Each one triggered the Check Engine Light. |
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there is no sensor on the EGR circuit for the ECM to know whether the circuit is functioning properly or not
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