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

85 EGR relay bracket

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Old Jan 14, 2023 | 05:43 PM
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Default 85 EGR relay bracket

Is the 85 EGR relay mounting different then the 86? My 85 bracket looks flat but my 86 manifold bosses are offset.

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Old Jan 15, 2023 | 12:11 PM
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Looks like a f body egr solenoid bracket that mounts on the rear two manifold to head bolt holes passenger side. The c4 mounts to the t stat housing.
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Old Jan 15, 2023 | 12:49 PM
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Default Parts

The bracket iam showing you came off an 85 vette. Manifold came off a 86 vette. I did find another egr relay. See pic. If you 85-86 guys can shoot me a pic i will be thankful.
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Old Jan 15, 2023 | 12:59 PM
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Post 12

https://www.corvetteforum.com/forums...-question.html
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Old Jan 15, 2023 | 01:03 PM
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From an '85 FSM. A correct solenoid for an '85 would be 1997111 originally (same as F-body), the bracket in your hand should match a 14087565 (generally available on e-Bay - you could use for visual comparison)


Last edited by WVZR-1; Jan 15, 2023 at 01:24 PM.
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Old Jan 15, 2023 | 05:14 PM
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Default Parts

Thanks Dave for that info. What a hot mess for a simple part. I have the relay and bracket for an 85 but since my manifold is an 86 there is no place for it. Maybe the right rear egr heat block off port mounting holes. I guess i need to look at an 86 egr relay setup.
then there is the egr temp switch, god knows where that is.
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Old Jan 15, 2023 | 06:51 PM
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I think I’d just extend wires and relocate to the front of the intake. You could spacer up the bracket to clear the 86 up rear coolant port or just simply relocate.
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Old Jan 15, 2023 | 07:26 PM
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Thanks for the super pictures, what thru me off was that only one of the holes is used. I believe I have all the vacuum hoses for the 85 so I will mount it back there. Now I just need to figure out the EGR temp sensor. I am wondering if thats an 85 only item.
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Old Jan 15, 2023 | 10:14 PM
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85 egr temp sensor is a different size than 86-89.
the egr valve has p or n fir backpressure stamped on the top. Possible to use a tpi f body 86 egr and zip https://www.zip-corvette.com/86-89-egr-valve-temperature-indicator-switch-wire.html
egr temp sensor or just delete malf 32 from your ecm chips tune. If you get the 86 egr and temp sensor might have to lengthen the wire .
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Old Jan 28, 2023 | 05:45 PM
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Default 86 vs 85

Ok there is a difference with the 85 bracket mounting to an 86 manifold. Its not just intake bolts, its the casting. I will have to make a custom bracket.

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