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What is this piece on the bottom of the CIS airbox?

See photo. Metal pipe that goes into the bottom of the airbox. What is this? Should it be sealed somehow? My engine has had so much silicone where it shouldnít and Iím having trouble even finding the name of this part so itís hard to find out if it needs o rings or what. Also I tried blowing throw it on both ends and nothing moves it acts completely clogged. Good or bad?


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Old 11-20-2020, 07:06 PM
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Old 11-20-2020, 07:10 PM
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ADD - cardinal rule for seeking advice is to identify your model.

I can guess that this is not a late SC - it has the flexible injector lines. Someone may recognize it by other characteristics, like a 73.5T. But is or was this engine from a Sportomatic, which has some extra plumbing? Or is it a US 2.7 and it is part of the exhaust gas recirculation system.
Old 11-20-2020, 07:56 PM
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Mysterious part........

Quote:
Originally Posted by ADDvanced View Post


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That steel tube goes to the EGR.

Tony
Old 11-20-2020, 08:57 PM
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77 911s.

Should there be an o ring?


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Old 11-21-2020, 07:33 AM
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looks like the upper part of California EGR system.
Old 11-21-2020, 12:42 PM
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Do I need it???


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Old 11-21-2020, 07:53 PM
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You in California? Or some other state which, for emissions purposes, requires you have all the EGR equipment? Probably then yes.

If where rules are laxer, and all you have to do is pass a gas sniffing test, then maybe not. Without the EGR pump and plumbing and all the rest, you probably should just plug the hole in the plastic air box, if it is screwed in there.
Old 11-21-2020, 08:23 PM
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So.... I have no idea where my car was from originally, but I don't have an EGR system. I don't have air injection or a smog pump. This pipe is clogged; it looks like someone jammed a piece of metal in the end of it, and threaded on another adaptor to seal it.

I really really do not want a vacuum leak on the bottom of my airbox. How are people sealing this area? The metal 'hex' on the bottom o the airbox is molded into the plastic, afaik you cannot unthread it.

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