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You might try 'Thermal Vacuum Switch' That is how TVS is defined
in the 1989-90 Geo Prizm facotry manual. By the way a 'TV' is a Throttle
Valve. What other kind of throttle is there?
<blockquote TYPE=CITE>I've been having problems with a 1985 Old 5.0L (307)
<br>Fortunately, I finally found a book that lists the problem and gives
<br>More fortunately, I'd already performed all the tests the<br>troubleshooter calls for (although not in that particular order).
<br>It said to replace the TVS.
<br>Unfortunately, it doesn't say what a TVS is, what it looks like, or<br>where on the engine it can be found.
<br>I tried googling for it, but all I can come up with is television sets<br>(TVs instead of TVS).
<br>Can anyone please enlighten me?</blockquote>
No worries. That site has been greatly helpful to me in the past.
Man, that is a pickle you've got there. Wish I could help, but I'm by
no means a mechanic.
Only thing I can think of is perhaps try posting in
I know it's a long shot, but who knows?
Best of luck to you!
Complicating the problem was that the online parts stores don't call
it that, their name for it is 'ported vacuum switch'.
But, sigh!, I finally traced it down, and found that couldn't be the
problem -- it doesn't control anything on this engine except the heat
riser, and my problem is that the rear vacuum break is shutting of
vacuum to the choke pull-off until the engine is warm.
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