01-05-2013, 06:59 PM | #1 |
A guy with a truck
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Name That Truck Part
At risk of appearing a buffoon, can someone please enlighten me to this component's name/description/purpose? All it was good for was a fat vacuum leak before I capped it off.
Never had a truck this original before, so I'm kinda stumped. Chasing vacuum leaks during a tune up and found this mystery part sucking wind. '72 Blazer, 4wd, 350/350, A/C. This is bolted to the intake manifold, on the passenger side, just behind the choke:
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01-05-2013, 07:51 PM | #2 |
Msgt USAF Ret
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Location: Kalamazoo, Michigan
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Re: Name That Truck Part
From what I have read about the system I believe that might be the TCS vacuum switch.
It controls vacuum to the distributor to prevent vacuum advance until engine warm up. TCS stands for transmission controlled spark. I think the green wire goes to the temp sender and the red wire goes to key on power.
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01-05-2013, 08:07 PM | #3 |
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Re: Name That Truck Part
Thanks! That makes sense. The tee before it is branched to the dizzy, so it is currently bypassed. Wonder where that teed line was supposed to go? The tee is an integral part of the assembly, not something someone put in there.
Posted via Mobile Device
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01-05-2013, 08:08 PM | #4 |
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Re: Name That Truck Part
In addition to the engine temperature as part of the control on the vacuum switch, the transmission has to be in high gear in order for the vacuum switch to allow the vacuum advance to operate.
There should be a switch on the transmission that is wired into the emission control system, (TCS). Jim
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01-05-2013, 08:47 PM | #5 |
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Re: Name That Truck Part
Learn something new every day... Was this a '72 only thing? I thought non-California trucks were safe from this mess
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01-05-2013, 09:05 PM | #6 |
"Ochre Ogre"
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Re: Name That Truck Part
I have seen it in that location on 1970's. My 71 suburban has it mounted to the front of the carb (same place as the 72's I have seen it on).
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01-05-2013, 09:07 PM | #7 | ||
"I ain't nobody, dork."
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Re: Name That Truck Part
My 1972 GMC had the TCS system on it when I got it. My truck has been in WA state for its entire life. I disabled it, and removed it.
Gary
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01-05-2013, 09:26 PM | #8 |
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Re: Name That Truck Part
http://67-72chevytrucks.com/vboard/s...d.php?t=464103
Try the above thread if you want some more info. Hope the link works, doing this from my I pad and its a little harder to paste things. But, yes it's part of the TCS system. Posted via Mobile Device
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01-05-2013, 10:27 PM | #9 |
A guy with a truck
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Location: Germany, for now
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Re: Name That Truck Part
Thanks everyone. I've done a little research on the system and it seems capping the solenoid was the right thing to do
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-Chris Instagram _elgringoloco_ '70 Short-Wide How to: Ruin a perfectly good C10 ‘70 Blazer ConversionHow To: Ruin a Perfectly Good 4wd '72 Highlander How To: Ruin a Perfectly Good K/5 (SOLD) '72 Blazer 2WD How to: Ruin a perfectly good Blazer (SOLD) '05 Yukon Daily Driven (not so stock) Yukon (SOLD) ‘07 Yukon Denali (daily) Members met list: SCOTI, darkhorse970, 67cheby, 67cheby'sGirl, klmore, porterbuilt, n2billet, Fastrucken, classicchev, Col Clank, GSFMECH, HuggerCST, Spray-Bomb, BACKYARD88, 5150, fine69, fatbass, smbrouss70, 65StreetCruiser, GAc10boy |
01-05-2013, 11:44 PM | #10 |
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Re: Name That Truck Part
It looks like I have one also. i have been wondering what it is. This is a 70 BBC 400 with California emmisions. I would like to delete....... what am i going to hurt and how would i go about it?
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