C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

EGR vacuum relay?

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Old Sep 17, 2007 | 09:49 PM
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From: Racine Wi
Default EGR vacuum relay?

I just installed my missing EGR relay that attaches on one of the thermostat bolts. The issue is I think it's leaking vacuum when it's switched on. It has 2 vacuum connections that are in the plug and one on the other end of the relay that looks like it should have somehting on it. It has a metal clip on it that looks like it holds a hose from coming off or a plug maybe. Does anybody have a picture of this or can tell me if yours has a plug on it or a vacuum line? I don't see more than 2 connections on the vacuum diagram but I don't know. Thanks.
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Old Sep 17, 2007 | 10:00 PM
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From: Database Error Indiana
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No vac line to the little clip. PM me your email address and I can send a pic, if needed.
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Old Sep 17, 2007 | 10:17 PM
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Default Any plug?

Originally Posted by Spankyellow
No vac line to the little clip. PM me your email address and I can send a pic, if needed.
Does it have a plug or anything on it? Or is it just the clip? I'm wondering if it supposed to have a plug to keep the vacuum from leaking out. I would imagine they used the relay on more than one model.
If you have a pic that would be great.
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Old Sep 17, 2007 | 10:24 PM
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From: Database Error Indiana
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Originally Posted by pack24
If you have a pic that would be great.
Pic should be in your email.
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Old Sep 17, 2007 | 10:31 PM
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Default Thanks

Pic is clear but it's kind of blocked by the hard line. It does look like there nothing else there.
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Old Sep 17, 2007 | 10:34 PM
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There are two vacuum connections to the EGR sol:
-vacuum source
-vacuum to the EGR Valve
The other opening is just the air bleed input.

Last edited by 65Z01; Sep 17, 2007 at 10:45 PM.
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Old Sep 17, 2007 | 10:39 PM
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From: Racine Wi
Default Makes sense.

That makes sense. I'll have to check another place for my leak. I may have an EGR that's leaking. It didn't start running rough until I put the EGR controls back on it. It only starts doing it after it warms up.
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Old Sep 17, 2007 | 10:44 PM
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Either the EGR valve or the EGR sol could be leaking. There is a diagnostic method on my site.
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