The thermostatic valve in the upper radiator hose simply bleeds off vacuum when
the engine gets hot so it automatically raises the idle speed -- supposedly to
prevent overheating by drawing more air thru the radiator.
If it's missing - no big deal -- you need to run a vacuum line from *both* of
the very small vacuum ports (1/16") on what are called the 'deceleration bypass
valves' on each carb ('T' them together and run it to the vacuum retard unit.
Set you timing to 4 degrees ATDC @idle with the vacuum lines CONNECTED. Make
sure the large (1/4") vacuum port on the bottom of the front carb is plugged
(this is where the vacuum was bled to from the thermostatic switch).
Have fun!
Steve Sutton
74 1/2 TR-6 - daily driver!
ssutton@ridgecrest.ca.us
35* 35' 39" N 117* 39' 44" W
> From: mrdr@buckeyeweb.com (The Romagni's), on 3/7/97 7:35 PM:
> Hi all;
>
> On my 74 TR6, all of the anti-pollution equipment was removed by the
> DPO. Not a licensing problem here in Ohio, however I have a question.
> With the removal also went the thermostatic valve in the radiator water
> line. With that gone, so too is the line to the retard unit on the
> distributor. Obviously the car idles too fast.
>
> Can I simply re-connect this line to one of the vacuum line's on the
> carbs? Or was vacuum being applied based on the water temp?
>
> Thanks!
>
> Marty Romagni
> 74 TR6
>
>
>
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