At 09:31 AM 8/7/2013, Bryan Feddish wrote:
>My TBS seems to be stuck in closed circuit and I 
>can’t seem to fix it.   It also appears that 
>this is an NLA (and quite pricey) part.  Does 
>anyone have a good used one they can part with?
>
>I have an 83.5 and this looks like the switch I 
>have though I’m not 100% sure.  It’s listed 
>for use with an ‘84.  This is what it looks like.
>
>Thanks,
>Bryan

Hi Bryan,

The list doesn't take attachments...you'll have 
to put the image up somewhere you can link to (I 
can put it up if you need).  Or if it was a link you forgot to put it in.

I'm not sure what your acronym TBS is supposed to 
mean...in WWII it was the Talk Between Ships 
short-range voice radio system the US Navy used.

TPS is a standard acronym for Throttle Position 
Sensor, and some people on the list have recently 
started using it inaccurately for our 
closed-throttle/Wide-Open-Throttle switches.  I 
suspect that's what you were aiming for, but it's not really correct.

There are only two setups, the original one you 
have and the replacement which came in I think 
some time in '85 and is totally different.  The 
new one hangs off the bottom of the throttle 
body, uses a single much smaller microswitch, and 
is operated by a cam off the bottom of the 
throttle plate shaft.  Cheaper to make but not as 
good as what you have, and needs a different throttle body.

There's a guy on theSamba who calls himself 
TenCentLife or similar -- does throttle body 
rebuilds and also has developed a vacuum-based 
replacement for that switch.  Scott Daniel has 
experience with it and likes it.  Might be worth checking out.

Yrs,
d