What is E.E.C. ?

**John Brown** · #1 01-12-2008, 02:10 AM

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

**njsteve** · #2 01-12-2008, 03:52 AM

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

Jacsey 70Z · #3 01-12-2008, 03:55 AM

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** · #4 01-12-2008, 04:21 AM

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

**YENKO DEUCE REGISTRY** · #5 01-14-2008, 05:45 PM

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** · #6 01-16-2008, 02:18 AM

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** · #7 01-16-2008, 03:42 AM

[ QUOTE ]
Picture of Muncie side cover with T.C.S. switch.

[/ QUOTE ]

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

**YENKO DEUCE REGISTRY** · #8 01-16-2008, 04:32 PM

Good explanation Rick, that was my understanding as well. I think the Deuces don't get the full advance until 4th, ie; the TCS is fully turned off when the engine is at operating temp and the trans is in 4th gear.

**Mr70** · #9 01-16-2008, 08:25 PM

Per Jacks chart,that would give it the characteristics of a TRUCK transmission,would it not?I'm curious if this is actually the case,and if the Deuce's 4spd.trans. applies vacuum in 4th gear only.
Please let us know your findings.

**YENKO DEUCE REGISTRY** · #10 01-16-2008, 11:31 PM

I guess I could simply start the car, get it warmed up, put the trans in each gear and simply wait till I hear the rpm's rise?

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