egr valve

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So your EGR valve doesn't have an internal vacuum port? What about swapping the intake manifold for an earlier model G63B? The EGR valves on them are 80% cheaper. I know you are tied to Cali emissions so this might be a no-go for you. The only other option is hell dodgy but not impossible - pry the top off the valve and swa p the diaphragm from a more readily available unit. I see guys fix their own vac advance servos on historic UK vehicles so it could theoretically be done

Thanks for sharing that my friend and I like the latter suggestion. However, for an assortment of reasons, including living in Commiefornia, I have decided to ditch the G63B and swap in a different power plant. I'll be hanging around here soaking up knowledge and exploring my options. Meanwhile I'll work my way through the other systems on the truck and renovate as needed.