22r distributor vacuum advance

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Joined
Jan 19, 2010
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8
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I have an 86 Toyota Pickup 22r. I'm trying to find out how to diagnose the distributor vacuum advance to find out if it needs to be replaced or not. I tested both tubes with vacuum. The one closest to the distributor will hold vacuum but slowly lose vacuum. The one further away from the distributor will not hold any vacuum at all. Does this mean that the vacuum advance diaphragm is bad?
 
You can block off one side of the vac adv.
It wouldn't mean its bad, but maybe going bad. I know i went through a couple oreillys cheapodepo distributors (with everything) before i got one that worked right.
vac1.webp
 
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