Parts ID - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BAGNDRAGIT · 01-15-2011, 10:08 PM

ok can anyone tell me what these are for?

its a 71 with an I6 auto (formally 3 on the tree.)

they are on the driver side, just next to the bulkhead connector.

Thx in advance!

oldblue1968chevy · 01-15-2011, 10:10 PM

maybe some sort of relay?

71 super · 01-15-2011, 10:14 PM

They are the relays for TCS- Transmission Controlled Spark- part of an early emission program that kept the distributor from reaching full advance until third gear. Should be a vacumn solnoid on intake mounted to a bracket of some type with two vac ports and a two prong flat connector on it for the electrical connection.

BAGNDRAGIT · 01-15-2011, 10:40 PM

Quote:

Originally Posted by 71 super

They are the relays for TCS- Transmission Controlled Spark- part of an early emission program that kept the distributor from reaching full advance until third gear. Should be a vacumn solnoid on intake mounted to a bracket of some type with two vac ports and a two prong flat connector on it for the electrical connection.

i see no extra electrical connector around the engine, and i see no connectors for the relays shown.

i keep finding things like this on the truck............drat.

also does anyone have an evap system diagram for the 6 cylinder? i have an extra line coming from the canister thats plugged. one is going to the tank and the other is going to a vac port on the carb so i am wondering where the third goes. air cleaner? intake?

thanks

01-15-2011, 10:08 PM	#1
BAGNDRAGIT Just Not Low Enough! Join Date: Mar 2009 Location: Phoenix, AZ Posts: 525	Parts ID ok can anyone tell me what these are for? its a 71 with an I6 auto (formally 3 on the tree.) they are on the driver side, just next to the bulkhead connector. Thx in advance! __________________ NEED ELECTRICAL HELP? ASK ME! 67-72 Full Wiring Diagrams Lots Of Info, TAKE A LOOK 1967 Chevy C-10 Shortbox Bagged 327 4spd Previous: 1971 Chevy C-10 Short Sep I6 Auto (Traded) 1973 Chevy C-20 THE REDNECK BATTLE TRUCK 2001 Chevy Silverado 2Dr 5.3L Shortbox. R.I.P. 1969 Volkswagen Bug This is my first meeting, I have a horsepower problem.

01-15-2011, 10:10 PM	#2
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: Parts ID maybe some sort of relay? __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

01-15-2011, 10:14 PM	#3
71 super Registered User Join Date: Sep 2005 Location: Canton North carolina Posts: 3,080	Re: Parts ID They are the relays for TCS- Transmission Controlled Spark- part of an early emission program that kept the distributor from reaching full advance until third gear. Should be a vacumn solnoid on intake mounted to a bracket of some type with two vac ports and a two prong flat connector on it for the electrical connection. __________________ 67 blue step side- bb 68 gold and white swb cst anniversary 68 custom swb hot rod Ls swap 69 swb cst 6 cylinder/ overdrive 69 black/black cst bb swb 70 orange and white cst Canada built truck swb bb 71 black and white super swb bb 71 red and white super swb 72 green and white super swb 4x4 62 nova wagon 400 series Ls swapped 68 Camaro 327/4 speed- 1 owner, original paint 66 Volkswagen bettle 69 auto stick Volkswagen Beetle



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