I didn't get into general vacuum troubleshooting since the vacuum at the valve was more than adequate (and wifely pursuits dictated that I quit for the day). I will attack the problem again in the morning, perhaps tomorrow will be more productive.

Thanks,
Jim

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2005 C240 4matic wagon (daily driver)
87 190D - 225K (on loan)
85 190D - 312K (on loan)
2011 Subaru Legacy AWD (Wife's)