Dedicated to the preservation, restoration, and enjoyment of all Rootes Group Vehicles
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Wow! Seems everyone is stumped?
The solution, after reading the shop manual was obvious. The powervalve cover was warped and letting (a lot) of air leak in. A new cover, burnished on a piece of flat glass completely solved the issue.
The manual has a great, but archaic way of testing the powervalve system.
