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![Secondary Air Check Valve
If this valve fails, hot exhaust can blow into the 2ndry air system, melting plastic & possibly starting fires.
Before madly ripping out all the emissions systems on your vehicle, read [url=http://www.fourdoorbronco.com/board/showthread.php?5427-Emissions-Systems]this article[/url].
See also:
[url=https://www.supermotors.net/registry/media/1167873][img]https://www.supermotors.net/getfile/1167873/thumbnail/secondaryairvalves.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/589993][img]https://www.supermotors.net/getfile/589993/thumbnail/secondaryair.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/320809][img]https://www.supermotors.net/getfile/320809/thumbnail/xtubenew.jpg[/img][/url]](https://www.supermotors.net/getfile/252399/fullsize/aircheckvalve.jpg)
Secondary Air Check Valve
If this valve fails, hot exhaust can blow into the 2ndry air system, melting plastic & possibly starting fires.
Before madly ripping out all the emissions systems on your vehicle, read this article.
See also:
. 
. 
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