I'm really not sure. I know the wax plug in the switch expands with heat,
and would block off the vacuum ports as it expands. I don't know if this
is supposed to happen with "normal" engine heat, or just overheated. I
just assumed that it closed them off at normal operating temperature, so
they would be open at start-up. This would make start-up characteristics
different. Don't know if that means easier start-up or just fewer
emissions at start-up.
At 08:00 PM 5/7/98 -0400, Tomislav Marincic wrote:
> Ted,
>
> I'm not a late TR6 owner, but I thought the purpose of the thermal
>vacuum switch was to eliminate the vacuum retard at idle if the engine got
>too hot, thus preventing overheating. If that's correct, it would have no
>bearing on your start-up performance. Am I mistaken here?
>
> Best Regards,
>
> Tom Marincic
>
>
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