Necropost>>> I must correct my initial post to keep everyone who's never heard of my described valve in the loop: When working, the valve opens a huge vacuum leak for a split second to the INTAKE manifold on a high spike of vacuum caused by the throttle snapping shut. This event (without the valve working) causes a rich A/F for a split second and the gas does not combust efficiently. When the valve works, it dilutes the air enough to allow the extra gas to burn. Ford called it a gulp valve and used it on everything in the 70's (Even Boss 429) AMC called it an anti-afterburn, *** called it deceleration valve, etc. My initial concern was mine was bad as the vacuum pod didn't hold a vacuum from my mitvac ( Thanks
@MoparMike1974) but maybe the thing doesn't have to be airtight as it seems to not affect idle when I plug the sense line. I got a spare used one in the mail and was checking it and I had to rehash this post. Tore it apart, found the vacuum diaphragm fine, tiny designed vent hole was cause of vacuum 'leak'. Now I gotta put it back together somehow, it was a crimped design. Method is drill holes in lip, RTV the diaphragm, and pop river the dome back onto the bottom. Reseal edge with RTV and let dry.
