Manifold Vacuum Experiment

92b said

Since the vacuum signal to the vacuum canister is the same at part throttle with ported vacuum as it is with manifold vacuum I was looking at the variables (canister adjustment and diaphram condition) as the potential cause for the change.

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That's the part I'm unsure about. Since I've not measured it, I'm not sure it is the same. It could be, some theories say it should be, but it might not be. I think it's all dependent on "how far" into "part throttle" we're discussing and since I've no measure on that, I cannot say for sure.