What is E.E.C. ?

[Schonyenko2]

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haven't really paid attention

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Ahh, George Bush syndrome. Not political, not political.

[YENKO DEUCE REGISTRY]

Had bigger fish to fry while I was defining 'is'

[ORIGLS6]

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The solienoid in the area you described is the TCS plug in. I remember that when I got my L78, and my friend got his 70Z, we were just settin in the car messin around with the shifter and noticed when you shifted it through the gears that it gained rpm(we checked both cars). We dug out the manuel, and it said it was called TCS.They got disconnected as we were told they worked against opening the secondaries in the carb. I was pretty sure it was 1st to 2nd, but it could be 2nd to 3rd. I know it was not 3rd to 4th. I expect it still would work on my deuce if I hooked it back up.

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I'm pretty sure it was 1st to 2nd. One of my buddies had a '70 454 Corvette and his did the same thing. I remember thinking it was odd that the RPMs jumped up if you put it in 2nd.

[John Brown]

Picture of Muncie side cover with T.C.S. switch.

[njsteve]

1972 455HO with M22, note position of TCS switch and harness.

[Jacsey 70Z]

70 Z28's are 3rd and 4th gears, thats how you test them to see if the system is working, by shifting into 3-4th and watching the rpm's climb. VA is for Vacuum.

[Mr70]

That's for ALL 1970 & up Transmissions equipped with T.C.S.,not just Z/28's.
Cool chart..

[YENKO DEUCE REGISTRY]

So, does it 'turn off' from 3-4th, or in 3rd & 4th? I never really noticed, was usually looking at Frankies door by then

[Mr70]

I think because this system is designed to provide vacuum only in a transmissions final gear,the intake mounted solenoid is "energized",(Turns On),right away when you turn the key to ignition.This vents the solenoid to the atmosphere and keeps any vacuum from reaching the distributors advance.
Once you hit the desired gear,2nd,3rd,4th or reverse,depending on what Trans.type you have,the ground field collapses,(Turns Off),via a trans. mounted switch and allows vacuum to now reach the distributors advance.
There's also a firewall mounted relay & a hot/cold temperature switch mounted in the head,that will override and collapse the field,(Turns Off),and allow immediate vacuum to the advance in all gears in the event the temperature goes above/below preset degrees.

[mockingbird812]

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Picture of Muncie side cover with T.C.S. switch.



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Here it is in its natural habitat.....