I have been having vacuum leak issues for months. Back in August I replaced the intake manifold gasket and that took care of the biggest one. However, I've still got some smaller ones. Spraying the vacuum tree on the back of the manifold with carb cleaner increased the RPMs so I took the tree out and put in a plug. Helped a little and no more RPM gain when I spray the base of the plug.
However, now when I spray the base of the thermactor (canister part in the first pic) I also get a steady increase in RPM. Does this canister generate vacuum? I'm not familiar enough with the smog parts to properly diagnose. In picture #2 you can see the #4 intake runner on the manifold. When I spray carb cleaner beyond that runner toward the canister, I get the steady RPM increase. So, it's either that canister or I might have a cracked manifold. There doesn't appear to be any other fittings in this area that could cause a leak.
What do you all think?
However, now when I spray the base of the thermactor (canister part in the first pic) I also get a steady increase in RPM. Does this canister generate vacuum? I'm not familiar enough with the smog parts to properly diagnose. In picture #2 you can see the #4 intake runner on the manifold. When I spray carb cleaner beyond that runner toward the canister, I get the steady RPM increase. So, it's either that canister or I might have a cracked manifold. There doesn't appear to be any other fittings in this area that could cause a leak.
What do you all think?