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The other thing would be to check the tune of the fast efi to see how advanced it is running at idle. Or if there is a table in the fast efi configuration for increasing advance at high temperatures.
Depending on the fast efi setup this is obtainable.
Another question, are you verifying the 200 plus degree temperatures with an in fared thermometer? With their recent size reduction there is no real reason not to have one now.
We could always vacuum bleed. The system too !
Does your thermostat have a pilot hole in it twards the top of the stat ?
We look forward to the details,
Steve
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Steve SPF 2734 MK3 / Brock Coupe #54- panavia.com
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