Re: My retarded vacuum retarder...could it be...

[Dave Massey <105671.471@compuserve.com>]

Joe writes:
>On my car, the vacuum retard unit isn't getting enough
>vacuum to retard the timing when the engine gets a little too hot, so
>the idle stays up around 1500 RPM.  I traced the problem to the thermal
>vacuum valve on the radiator hose leaking when it gets hotter than
>normal.

Joe,

Do you suppose that the thermal vacuum switch was designed to 
do that?  To increase the idle speed and thus the cooling air flow
when the engine gets hot?

Just a thought.

Dave Massey (former owner of a ' 74 TR6 with thermal vacuum switch)