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

EGR Blockoff plates

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Old Aug 24, 2005 | 03:52 PM
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Default EGR Blockoff plates

Is it necessary to remove the runners/rail on the pass. side to get access to those bolts on the EGR tube? It looks like you could just take off the distributor to get the top bolt, but the one underneath looks like it could be a bitch to get at.
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Old Aug 24, 2005 | 04:23 PM
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Eesh, you might be able to. SR or TPI runners?
I think you might need to pull that runner if its SR, not sure about TPI.

Ok, w/o the EGR pipe there (I have block-off plates) I can access both bolts in my block-off plate. This is with an allen head bolt too. All I need off is the vc's and you have at it. I think if I remember correctly the egr pipe in the stock plate that goes there, makes it funky, and thus might need to pull a runner.


Anybody else know better?

Last edited by USAsOnlyWay; Aug 24, 2005 at 06:44 PM.
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Old Aug 24, 2005 | 04:25 PM
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Just one thought...SMOG ****'S.
Good Luck.
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Old Aug 25, 2005 | 02:30 PM
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ttt
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Old Aug 25, 2005 | 02:38 PM
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Seems like I used a 1/4" drive torx and got to mine without taking out the distributor. If you take the tube out of the header it should wiggle out of the way so you can get at the bottom bolt.
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Old Aug 25, 2005 | 04:07 PM
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I just had my intake off and used a narrow body Torx on a 3/8" extension to get to all 4 EGR tube bolts (my '88 has bolts to a flange on the exhaust header).

BTW, if you run a 160deg T-stat & fan switch your ECM will not call for EGR; it only does so during cruize when coolant temp is over 175deg F.
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Old Aug 25, 2005 | 08:21 PM
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The car will definitely still get to 175F, especially when its 110F heat index outside, so I will run into Code 32 issues. I already have the aux fan coming on early, and the main fan comes on at 195. I may just try your diode trick, or have a chip made to take out EGR function entirely.

I'm about to install headers that have already had the EGR port plug welded, so I'm going to have to delete EGR, pointless to try to cut and weld through the Jethot ceramic coating.

I just dont want to have to make this a bigger job than I need it to be.
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Old Aug 25, 2005 | 08:27 PM
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You can just remove the tube and block the hole on the intake end. Leave the rest of the EGR in place and the ecm will think it still works. No code.
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Old Aug 25, 2005 | 10:29 PM
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On an '86 the ECM will throw a code 32 if it calls for EGR and doesn't see the EGR Temp switch grounded, indicating that eshaust gas is flowing into the intake.
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