What is this on the firewall? Demons and Dusters

danbobracer

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What is this on the firewall? I’ve seen it in picture of 71 and 72 demons. What is it and what determines if a car has it? I’m assuming it is emissions related. Thanks in advance.

6E805F6C-F6C6-4380-A1B8-32796A45A916.jpeg
 

justcuz

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I have it on my 71 Demon. Option code is N95 I think.
928E5720-7831-4063-975D-A36C3B2AB17F.jpeg
 

Syleng1

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I’ve owned over 10 @ 1972 cars with every engine and never saw that here in New England. Maybe California emissions stuff? Air cleaner heat flapper valve controller? Just guessing.
 

ACME SS

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I'm not sure how to link to an old post but I found this when I searched on the interwebs...it is actually an fabo post. EDIT: I did a little search and believe it to be a NOX valve which apparently was a CA requirement.
upload_2022-8-19_7-11-28.png
 
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Stephen Mulkey

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Yes, that's what i was told. It's for California Emissions. Don't ask me how or where, haven't got that far yet.
 

JDMopar

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I had (wish I still had) a 71 Challenger 318 car sold new in California, and it had that crap on it. The car had the N95 code. It all ended up in the trash when I redid the engine compartment.
 

67Dart273

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That is indeed emissions.

All of this is detailed in the factory service manuals which you can download--up through 73 --for free from MyMopar. Some of them there got there because of the guys on here. For those needing a 74 manual, PM me. It's free
 

RustyRatRod

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Maybe, just maybe, if you could take another photo, but this time like 50 yards away.
 

MoparMike1974

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OSAC valve would be there 74+. In 73 they had the hole cut but it had a block off plate. Im not sure what would have been there pre-73 but it would likely be CA only with emission package.
 

jos51700

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It's a hole plug for a wide-band O2 sensor and EFI wire harnesses.
 

Brooks James

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My 71 Nova had a module on it to retard the timing in high gear for emissions. I think the OSAC does the same
 
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