TCC solenoid on a 72 vette???

[vettecop]

Working on a 72 big block Vette. The car has a TCC solenoid between the carburetor and the distributor, with what appears to be a factory wiring harness. However the part does not appear in any of the assembly manuals. Does anyone know if the 72 big block cars are supposed to have a TCC solenoid. I am starting to think this car has a later C3 wiring harness. Any help is appreciated.

 

[grumpyvette]

heres a bit of info I found posted else ware

DOES ANY OF THIS HELP??
TCS Solenoid Valve (GM Part #1114451).
http://www.c3vr.com/vrforums/message309849.html
http://www.zip-corvette.com/GroupDetail ... .aspx?gid={0cf9bd6e-1850-4128-9a30-6ac78724d7a8}&SearchType=_GROUP_SEARCH&GroupName=TCS+Solenoid+%26+Switch&

http://www.autozone.com/autozone/repair ... 52800836b0

http://www.autopartsobsolete.com/1972-c ... 14451.html

http://www.wiringharness.com/tcs.htm

When the solenoid is de-energized the internal spring pushes the plunger forward and seals off the path to manifold vacuum. The distributor sees around the plunger to open air or in some cases ported vacuum (i.e. '74 big blocks with manual transmission).

When the solenoid coil is energized the plunger is pulled rearward by the solenoid coils opening the path to manifold vacuum. The distributor pathway still sees the rear port but it doesn't matter you just suck air in through the back (the reason for the filter) or in my case the distributor also sees ported vacuum.

The thing to see from this is that the solenoid breaks in favor of the treehuggers.

There is also a temperature switch on the block that opens a ground path to the solenoid when the engine is too cold or too hot. It's a bi-metalic strip that makes contact on one side of the switch below a certain temperature and on the other side of the switch above a certain temperature. Mine broke coming out so I got to see the insides.

Some models also have a timer relay so that the solenoid is energized for a set time while starting a warm engine. I say some models because mine did not have one.

On some models there is also a switch at the transmission that energizes the solenoid when you are in high gear. Again I say some models because I didn't have one of these either. (apparently on big blocks with automatic transmissions you get ported vacuum unless the engine is too hot or too cold then you get manifold vacuum, so in my case it has nothing to do with the transmission, only temperature).

To troubleshoot the system first see if the solenoid is operational. Unplug the wires to the solenoid and connect it to a 12 volt source (one terminal to the + and the other to the -. I don't think it matters which one but if you want to make sure the tan wire that you take off is the + source when connected. When you disconnect the power you should hear the plunger snap forward. If you can't hear anything you can verify KIA by hooking up a short section of tubing to the manifold vacuum port. With the solenoid de-energized suck on the tube the path should be closed. Now energize the solenoid, you should be able to suck air through the tube. Alternately cover the distributor port and rear port to make sure both paths are clear. As a final check de-energize the solenoid and hook the tube to the distributor port and suck through the tube to make sure there is a clear path to the rear port when de-energized.

Once you have determined that the solenoid is OK you can make up a test light with an old 12v light socket and bulb with sufficient leads to get the light outside the hood where you can see it while driving, use a couple crimp on spade terminals to connect to the plug. You may also want to connect the distributor directly to the manifold vacuum for the test drive.

Start the car (light should come on) engine is cold

Let engine warm up (light should go out).

After engine warms up shut car off and immediately restart car (light should come on) timer activated.

Atfter a short time (light should go back out) time runs out.

I wouldn't suggest testing for engine too hot.

Now drive the car to where you can get it into high gear. When you shift into high gear (light should come back on).

This is of course if you have all the bells and whistles.

Mine did not work so I tore it out wiring and all.

Hope this helped.

David

ransmission Control Spark Solenoids
Often referred to as T.C.S. Solenoids; these solenoids control vacuum to the distributor vacuum advance unit. The solenoid determines when and how much vacuum to release. Typically a vacuum line from the carburetor enters the solenoid and another vacuum line exits the solenoid to the distributor vacuum advance unit (some applications have multiple inlet and outlet lines). The solenoids also rely on an electrical signal provided by other T.C.S. system switches/senders via an electrical connection on the back or side of the solenoid (the Engine Harness or T.C.S. Harness plugs into this connection).

Sorry we have no remaining stock on these, all have been discontinued.
PART # YEAR DESCRIPTION
CAMARO
01114432 70 T.C.S. Solenoid, V/8, 2 bbl. & 350 c.i. 4 bbl
01114434 70 T.C.S. Solenoid, 396-454 & 400 c.i. 4 bbl.
01114432 71 T.C.S. Solenoid, V/8, 2 bbl. & 350 c.i. 4 bbl.
01114451 72 T.C.S. Solenoid, V/8, 307-350-400 c.i. (with California emission control option - NB2)
01114453 72 T.C.S. Solenoid, 402-454 c.i
01997410 73 T.C.S. Solenoid, V/8, 307 c.i., manual trans
01997410 73 T.C.S. Solenoid, V/8, 350 c.i., manual trans, exc. Special High Performance
CHEVELLE
01114432 70 T.C.S. Solenoid, V/8, 2 bbl. & 350 c.i. 4 bbl.
01114434 70 T.C.S. Solenoid, 396-454 & 400 c.i. 4 bbl.
01114432 71 T.C.S. Solenoid, V/8, 2 bbl. & 350 c.i. 4 bbl.
01114451 72 T.C.S. Solenoid, V/8, 307-350-400 c.i. (with California emission control option - NB2)
01114453 72 T.C.S. Solenoid, 402-454 c.i.
01997410 73 T.C.S. Solenoid, V/8, 307 c.i., manual trans
01997411 73 T.C.S. Solenoid, V/8, 454, manual trans
01997410 74 T.C.S. Solenoid, V/8, 350 c.i., manual trans, exc. Special High Performance
01997411 74 T.C.S. Solenoid, V/8, 454, manual trans
NOVA
01114432 70 T.C.S. Solenoid, V/8, 2 bbl. & 350 c.i. 4 bbl.
01114434 70 T.C.S. Solenoid, 396-454 & 400 c.i. 4 bbl.
01114432 71 T.C.S. Solenoid, V/8, 2 bbl. & 350 c.i. 4 bbl.
01114451 72 T.C.S. Solenoid, V/8, 307-350-400 c.i. (with California emission control option - NB2)
01114453 72 T.C.S. Solenoid, 402-454 c.i
01997410 73 T.C.S. Solenoid, V/8, 307 c.i., manual trans
01997410 74 T.C.S. Solenoid, V/8, 350 c.i., manual trans, exc. Special High Performance
CORVETTE
01114432 70 T.C.S. Solenoid, V/8, 350 c.i.
01114434 70 T.C.S. Solenoid, 454 c.i.
01114451 72 T.C.S. Solenoid, V/8, 350 c.i.
01997410 73 T.C.S. Solenoid, V/8, 350 c.i., manual trans
01997411 73 T.C.S. Solenoid, V/8, 454 c.i., manual trans
01997410 74 T.C.S. Solenoid, V/8, 350 c.i., manual trans
01997411 74 T.C.S. Solenoid, V/8, 454 c.i., manual trans
IMPALA
01114432 70 T.C.S. Solenoid, V/8, 2 bbl. & 350 c.i. 4 bbl
01114434 70 T.C.S. Solenoid, 396-454 & 400 c.i. 4 bbl.
01114432 71 T.C.S. Solenoid, V/8, 2 bbl. & 350 c.i. 4 bbl
01114451 72 T.C.S. Solenoid, V/8, 307-350-400 c.i. (with California emission control option - NB2)
01114453 72 T.C.S. Solenoid, 402-454 c.i
01997410 73 T.C.S. Solenoid, V/8, 2 bbl., station wagon only
CHEVY TRUCK
01114432 70 T.C.S. Solenoid, V/8, exc. 396 c.i.
01114451 72 T.C.S. Solenoid, V/8, 307-350 c.i.
01997410 73 T.C.S. Solenoid, V/8, 307-350 c.i.
01997410 74 T.C.S. Solenoid, V/8, 307-350 c.i

 

[vettecop]

Thanks for the info!!!

 

[grumpyvette]

glad to help!
why not post a bit more often about your projects?
got any pictures/