I always thought it provided Oxygen [or air as it be] to help light off the catalytic converter and burn more "stuff". Got to love those technological terms! :] -- Mark Price Morgantown, WV 1969 AMC Rambler, 4.0L, EFI, T-5 2004 Grand Cherokee Laredo, 4.7L, Quadratrc II " Chronic Pain Hurts" -------------- Original message ---------------------- From: Jim Blair <carnuck@xxxxxxxxxxx> > Sometime in the early '90s they developed a cat that was anerobic (didn't need > the AIR pump after that) My opinion of the whole AIR system was that it just > used a measured mixture or air blended into the exhaust to convince the emission > test equipment there really was a drop in HCs and CO (especially in cars that > didn't even have a cat!) > > > From: Wrambler242@xxxxxxxxxxx > Subject: Re: [Amc-list] dumping the snake > To: "AMC/Rambler owners, drivers and fans." <amc-list@xxxxxxxxxxxx> > Message-ID: > > <040320080318.14801.47F44C8400021C36000039D12216548686CDCBCD0A0C079D9F059D0E03@c > omcast.net> > > > They "played" with the system till they finaly managed to do away with the pump. > I think the key was getting the exhaust to "draw" in enough outside air to light > of the cat or alter NOX levels. > I don't know much about that kind of stuff, never had to figure it out, yet... > Anyway, they went from pump to no pump over a few years. > I think the later models just had feed tubes to the exhaust and cat, not the > tube manifold into the exhaust manifold. > > -- > Mark Price > Jim Blair, Lynnwood, WA '87 Comanche, '83 Jeep J10, '84 Jeep J10 > > > _________________________________________________________________ > Get in touch in an instant. Get Windows Live Messenger now. > http://www.windowslive.com/messenger/overview.html?ocid=TXT_TAGLM_WL_Refresh_get > intouch_042008 > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > http://splatter.wps.com/pipermail/amc-list/attachments/20080403/628df0e7/attachm > ent.htm > _______________________________________________ > Amc-list mailing list > Amc-list@xxxxxxxxxxxx > http://splatter.wps.com/cgi-bin/mailman/listinfo/amc-list _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://splatter.wps.com/cgi-bin/mailman/listinfo/amc-list