Interesting problem with the Spitfire, though probably not all that
interesting to the person trying to fix it!
Given that other electrical things can be ruled out from the work already
done, here are some possibilities. The problem may not be heat-related, but
rather, running-time related. For examples: Blocked fuel filter. Block
air source into the fuel tank (a line from the charcoal canisters up
front?). See if opening the gas filler cap helps. Check also (but
seemingly not so likely): Leaking vacuum lines and diaphrams (retard only,
I suspect).
The EGR valve might be a problem but really isn't necessary. If your air
pump is seized or otherwise nonfunctional and therefore removed, it isn't
doing much for emissions anyway. You can pull off the small vacuum line
that actuates it (and plug the end going to the carb).
Someone on the TR list once described a scenario where the valves were so
tight that it ran poorly once warm. However I suspect you've check them.
Jim Muller
jimmuller@pop.rcn.com
'80 Spitfire (Percy)
'70 GT6+ (Nigel)
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