Quote:
Originally Posted by Jeremy5848
After a short but intense struggle, I got the ALDA off of my '87. Exercising it on the bench with my Mitivac, I noticed that the ALDA's inner works moves up (relative to its installed position on the IP) as Mitivac pressure (mimicking turbo boost) is applied to the diaphragm via the hose barb. That would in turn allow the plunger on the IP to move up, presumably allowing the IP to squirt more fuel into the engine. Do I understand correctly?
However, I also noticed that often during the exercise the plunger in the ALDA snapped back to its original position with a soft but noticeable "click." Is this supposed to happen? It didn't seem to matter how much or little pressure was applied to the ALDA or how long it was applied. It almost always happened and it took a second or a few seconds after I started pumping the Mitivac.
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You've got it down perfect.
The reason that it snaps back to the original position is that it leaks. Just about all of them leak. But, the engine has an unlimited supply of air for boost, so the leak past the shaft seals is nothing to be concerned about. Naturally, unless you keep pumping the Mityvac, the ALDA is going to return to it's preferred position..........the up position..........without any fuel enrichment.