C3 Vette Registry - The Best Resource on the Net for C3 Vettes! C3 Vette
Forums -> C3 Fuel, Emission Control, and Exhaust Systems
Not Logged In! Login or Register!  Users Online: 13 / Help 
Features  Find C3 Parts on ebay in only 2 or 3 clicks!  | Add YOUR C3 to the Registry

Supporting Vendors
Bair's Corvettes
VetteBookStore.com
CorvetteClothing.com
Volunteer Vette Products
Mid America Motorworks

C3 of the Month
None Current
Enter Yours Today!
Online C3 Show
13
C3s are Registered

Vanity Plates
ILRUNYA
bradjarmstrong
Featured Links

Buy Now
Corvette from the Inside
Corvette from the Inside


Corvette Fifty Years (Hardcover)
Corvette Fifty Years (Hardcover)


Motor Trend - $5 for 12 issues.
Motor Trend
Only $5 for 12 issues.


Chevrolet Corvette: 1968 thru 1982, All V8 models (Haynes Manuals) (Paperback)
Chevrolet Corvette: 1968 thru 1982, All V8 models (Haynes Manuals) (Paperback)



| Hide Signatures and Profile Pics

 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
2/22/10 11:19am - Original Message: 'temp senders'
manchestershark Lifetime Member
Lifetime Member
- Send Private Message


Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1901
 My 72' has two temp senders. One is on drivers side, with single blade wire tab, the other is on passenger side toward the rear. It has a two blade wire hookup. The tabs run at right angles to each other, not paralell. The drivers side was hooked up, the passengers side was not.  What wire or plug goes on it, and what does it do?   THANKS   Mark
 Reply Reply  Quote Reply w/Quote
 
Support C3VR!
Suport our advertisers
2/22/10 1:10pm - Reply: 'temp senders'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19459
Pass side sensor is for the TCS(Transmission Controlled Spark) system. This system allows/blocks vacuum to the distributor advance. There is also a timer located on the firewall that delays the application of vac. for about 20-30 seconds. The signal for the system comes from the transmission...on the automatic, it operates in 3rd gear only. On the 4 speed, it operates in 3rd and 4th gear.
What it does is delays the vac. advance to the distributor until the car is in high gear. It's part of the emissions requirements...


____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
2/22/10 2:21pm - Reply: 'temp senders'
manchestershark Lifetime Member
Lifetime Member
- Send Private Message


Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1901

 THANKS Joel, Does that mean that if it is not hooked up it will not delay the advance? I know the wire, it is in the Air Cond wire braid. It was never hooked up, far as I can see. The plug end has a small mud wasp clog in it. Should I leave it unpluged or hook it up?   Mark   This is an electrical wire not a vaccume line.     Thanks     Mark



____________________________________

Click on image for full view
 Reply Reply  Quote Reply w/Quote
2/22/10 11:18pm - Reply: 'temp senders'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19459
It depends on how much of the rest of the system is still there, and hooked up. If the other components are there, but the temp sensor in not connected, then the distributor may never be getting any vacuum when it should. You could follow the vac line from the distributor to see where it goes. It should go to a solenoid bolted to the front pass side of the intake. If it goes directly to the carb, then they TCS system has been bypassed.
I think I have a schematic of the earlier TCS system, but I'll need to dig around some. In the meantime, I know this subject has been discussed here in the past, so a "Search" may bring up a thread/post that describes the complete set-up, and how it functions. Different year models, and engines used slightly different components, too. For instance, my '74 is only set-up to work the system in 4th gear, where the earlier cars work it in 3rd and 4th. Some '74s also did not have the timer set-ups. This was some of the early attempts to comform to the Gov-ment regulations on emissions, so some of it was pretty much hit or miss. 
Adams' Apple2010-02-22 21:19:24

____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
2/23/10 8:32am - Reply: 'temp senders'
manchestershark Lifetime Member
Lifetime Member
- Send Private Message


Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1901
This is a new lesson for me. Never saw this set up. The sender is in the block/water jacket. The vaccume line for advance is a direct hook up to the carburator. The advance works when needed, as I replaced it due to a performance lag, and made a considerable difference in pizzaz. If this is a block only when A/C is on I have not tried that.  The solenoid you speak of is not there, and no brackets for it. Could this car be a MISS on the attempt for emissions?  I will do some more home work and see what I can dig up. The carb is a Q-jet, and the only thing on that side is the choke coil reset on intake.   THANKS  Mark

____________________________________

Click on image for full view
 Reply Reply  Quote Reply w/Quote
2/23/10 10:04am - Reply: 'temp senders'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19459
[QUOTE=manchestershark]The sender is in the block/water jacket.[/QUOTE]

In the block, or the head??? If you have something in the block itself, where one of the freeze plugs would go, that would be a block heater, which was an option on cars sold in the North, where it gets a wee bit chilly. If it's in the head, then it is the sensor for the TCS.
Got pics?

From the sound of it, your TCS has been totally removed. If you're trying to put it back all "original", some of the parts may be hard to find, or really expensive if you can find them. If you're just wondering what the thing is, that's a different story.
I'm still looking for pics and descriptions of the TCS system.


____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
2/23/10 11:47am - Reply: 'temp senders'
VetteSpecialties
Former Member
- Send Private Message


Mounds View, MN - USA

Vette(s):
70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe

Joined: 5/24/2007
Posts: 1031
Joel is right.  The original TCS system included a temp sensor in the right side head, which you still have; a switch in the transmission side cover, which is probably still there, as it was built in; and a solenoid valve which mounted between the distributor and carb.  The valve is available in repro for about $90.00.  Then you just need the wires, which are available, and vacuum lines.  It doesn't make your car run any better, but is correct.

Larry


____________________________________
Corvette Specialties is your best source for Corvette parts, accessories and gifts. www.CorvetteSpecialties.com

   





 Reply Reply  Quote Reply w/Quote
2/23/10 4:24pm - Reply: 'temp senders'
manchestershark Lifetime Member
Lifetime Member
- Send Private Message


Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1901
 BOTH sensors/plugs are in the water jacket. Left one is for engine temp guage, single tab electrical. The right one was not hooked/no wire, up. BOTH are brass with phenalic black center and brass tabs for wires.  They both look the same, save one has two tabs and one has one. The wire I found loose has a mud wasp plug in it and is in the braid from the A/C. I am thinking the two must be mated, but do not know thier purpose.  NOT interested in a CORRECT/spec car, just want to hook it up if necessary. I looked at a 75 and a 76, they both have a plug with a square hole for a 3/8 drive extention or ratchet to remove it. They are definatly not in the soft plug holes.  Not looking to beat a dead horse, just want to figure it out.  If it is not necessary I will just put a plug in it. All I have is what is there.  THANKS  Mark

____________________________________

Click on image for full view
 Reply Reply  Quote Reply w/Quote
2/23/10 11:16pm - Reply: 'temp senders'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19459
Since the rest of the TCS sytem is MIA, just leave that plug unplugged, and hide it if ya want. It will not hurt anything to leave it unplugged.
As a bit of info, the sensors do look similar, but have different connectors, as you state. However, they do NOT operate the same. The TCS sensor is kind of a 3-way sensor. It is basically an "Open/Closed" type sensor, instead of the thermistor type sensor used for the gauge. The TCS sensor allows for vacuum to the dist on a cold start for a short period of time, regardless of what gear the trans is in. Then it goes into "gear specific" mode, only allowing vac when in 3rd & 4th gears. IF the engine gets too hot, the sensor will allow full vac to the dist at all times, until the engine temp comes down to a "normal" operating range.
Adams' Apple2010-02-23 21:20:00

____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
2/24/10 10:45am - Reply: 'temp senders'
manchestershark Lifetime Member
Lifetime Member
- Send Private Message


Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1901
  MORE INFO. I did some home work in the Mid-America assembly manual. I found the switches, both of them. The info the guide gave was only for the LS-5 and LS-6. Does this also apply to the LS-3?  I have the switches in the proper places, but no wires. There is also no AIR pump,solonoid, spark tube or other smog stuff.  I do have A/C if that makes a difference. The carb does not have a solonoid on it either.  The wire I found is not the one for ths TCS switch, wrong plug. Removed the mud from end.  THANKS for the input, I am going to leave well enough alone and hook up what I have for asthetics and forget the rest.  The car runs well so I am happy.   Mark  
            
             Once again, You people are great to know.  THANKS for the help.  This is GREAT site.
manchestershark2010-02-24 08:47:16

____________________________________

Click on image for full view
 Reply Reply  Quote Reply w/Quote
2/24/10 9:33pm - Reply: 'temp senders'
dskopp
Former Member
- Send Private Message


Oak Creek, WI - USA

Vette(s):
1981 Great White Shark. Red Interior, 350/190hp. PS, PB (SS), A/C CC, T-Tops, Going to remain as Stock as possible. Served three years in Active Duty Army, then Retired Air Force after 34 years! Badger State Vetts Car Club. 175,000 Original miles!!

Joined: 5/21/2008
Posts: 1956
This site is only as great as the people in it!!  That includes you, Manchestershark!!!! (I do not know you well enough to call you by your first name)!!  lol
DanRolling On The Floor Laughing


____________________________________
          



(click to see a larger image)
 Reply Reply  Quote Reply w/Quote
2/25/10 8:47am - Reply: 'temp senders'
manchestershark Lifetime Member
Lifetime Member
- Send Private Message


Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1901
Embarrassed  I will try to shorten it up for ya a bit Dskopp.  Just take the first two letters of the screen name and the last two letters and there you have it.  Big smile      THANKS DAN

____________________________________

Click on image for full view
 Reply Reply  Quote Reply w/Quote
 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
 Forums -> C3 Fuel, Emission Control, and Exhaust Systems
(Moderator: Adam Wartell, Norsky, Adams' Apple, kstyer)
 

 
Official C3 Vette Registry Community:
Home | Forums | Email | Who's Online | Clubs | Events | Member Stats

Other Official C3 Vette Registry Areas:
Members | Research | Shop | My Account | About C3VR
 

Corvette is a registered trademark of the General Motors Corporation(GM) & Chevrolet Motor Division. Vette Registries, LLC is responsible for all site content (except for member submitted content or where otherwise noted) and does not claim or imply that Chevrolet or GM is responsible for Official C3 Vette Registry content. Vette Registries, LLC is independent from GM and is not affiliated with, sponsored or supported by GM.  Copyright/trademark/sales mark infringements are not intended, or implied and are in fact used to support GM, Chevrolet and Corvette

Official C3 Vette Registry content is Copyright 2001-2017, Vette Registries, LLC. Content may not be reused without written consent. All Rights Reserved. NS

Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 30