Can someone confirm that this is the temp switch connector? It's in the right place and the right shape according to my service manual. Right side of engine block, just above the #8 spark plug. As you can see, the plastic connector is shot and this is the guy that shorted and shut down the entire electrical system. What are the chances that the local Chevy dealer has this connector in stock!

 

Looks like your vette is 70-72. Thats the TSC temp sender(thermostatic temp override switch). It functions is this system:




The temp sender is in the left head between 1&3 plugs.

 

Thanks a lot, Dennis. Yes, vette is a '72. Is this any type of critical component that can cause any damage if I drive with it disconnected? By the way, what book is that wiring diagram from?

 

The TCS system, bypassed by MANY folks, works in conjunction with a timer, a relay, and a switch on the transmission. It gives you ported and unported vacuum to your vacuum advance. If you don't have a solenoid on the right rear of your car and don't have vacuum lines from the carb to the solenoid and then the solenoid to the vacuum advance, then your TCS has been bypassed. It does not hurt anything to bypass this system except add a wee bit more polution to the atmosphere. Fwiw, my 100% stock engine has all of the TCS working but I run straight vacuum from the carb to the vacuum advance unless I am having the car NCRS judged.

Btw, the system only works in fourth gear and only after a delay of around 30 seconds +/-. If you want to run your system as original then you need to check and make sure that all of the components work. If you want further information, I will be happy to copy them out of the 1972 GM Service Manual for you.

Gary

 

Gary, thanks for the detailed explanation. I have a '72 GM Service Manual and will check it out in more detail now that I know what I'm looking for.

 

Fwiw, I looked long and hard for a detailed explanation of the TCS and finally found it in the Emissions Section, IIRC.

Gary

 

QUOTE=GaryS

Btw, the system only works in fourth gear and only after a delay of around 30 seconds +/-. If you want to run your system as original then you need to check and make sure that all of the components work. If you want further information, I will be happy to copy them out of the 1972 GM Service Manual for you.

Gary[/QUOTE]

Actually the solenoid is energized in 3rd and 4th gear for 4 speeds

When energized the vacuum is blocked off from the distributor. The additional nipple on the solenoid then allows excess vacuum from the distributor to vent back through the solenoid and into the rear off the carb.(preventing vacuum lock)

 

Dennis & Gary,

Thanks for getting me pointed in the right direction on this. I just found the section in the GM Manual with the detailed description of the system. Now, I have one more favor, because I don't have a parts manual. Do you have the GM part number for this plug? It's the Temperature Switch plug for the TCS System. My assembly manual does not show the part and I've found that if I had a real part number, it *might* be possible to get an aftermarket plug.

 

[/QUOTE] Actually the solenoid is energized in 3rd and 4th gear for 4 speeds

When energized the vacuum is blocked off from the distributor. The additional nipple on the solenoid then allows excess vacuum from the distributor to vent back through the solenoid and into the rear off the carb.(preventing vacuum lock)[/QUOTE]


Dennis, the solenoid for 1972s only works in fourth gear. For 71 and I think 70 it was third and fourth.

Alanbl, I don't have the part number for the TCS temp switch but I had no difficulty finding it in most of the corvette catalogs. For instance, I looked in Corvette Centrals catalog and did a search on "TCS temperature". It showed up about half way down. Very easy to locate a new unit. IIRC, a good way to see if the temp sending unit is bad is to take off the plug and ground it to the block. If all of your components are there and working, then grounding the TCS temp unit to the block will make the engine increase rpm. This is an indication that the components all work and the TCS temp unit is bad. THis is all from memory though.

OOPS! I just realized, after I saw your similar post on the NCRS DB, that you are looking for the plug not the temp unit. As was suggested, these plugs are abundant in salvage yards. I picked up one for nothing along with things like temp sending units, interior chrome screws, small engine pieces, etc.
Gary
72 LT1

 

Try this one

http://cgi.ebay.com/ebaymotors/ws/eB...RK%3AMEWA%3AIT

 

Yeah, it's confusing! I am looking for the plug. Actually the link to the temp switch itself and finally getting to a part number helps in order to reference the plug. Bottom line, I think, is that this plug is fairly common on a variety of cars and going to a salvage yard should be the ticket. Thanks for all your input.

 

My 70 has a TCS jumper from the main engine harness.The jumper has the terminal connector your looking for on it. I checked this site and it lists a 72 jumper for the TCS as well.(VIG7074TSC)
http://www.lectriclimited.com/corvet...log-pdf/72.pdf