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Old Apr 9, 2009 | 08:46 PM
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[IMG][IMG][/IMG][/IMG]I saw it today just hanging down on the pass. side of my 74 coupe by the fender. It has orange overspray on it so I thought maybe it was mounted on the block at some point. It is obviously vaccuumed controlled but I don't know. I haven't had the car that long and the Haynes manual stinks. I need to buy an assembly manual I guess. Anyway, any help would be appreciated. Thank
Frank

Last edited by fhickey; Apr 9, 2009 at 09:07 PM. Reason: pics did not work
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Old Apr 9, 2009 | 08:48 PM
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Pics didny work. I'll try something different.


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Old Apr 9, 2009 | 08:48 PM
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Pic isn't working. I would also suggest buying the Chassis Service Manual for your year.
Glenn

Edit- saw the pic-that's the TCS switch. Hooks up to the tranny & carb. TCS means Transmission Controlled Spark. It's an emissions device.

Last edited by GD70; Apr 9, 2009 at 08:50 PM.
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Old Apr 9, 2009 | 09:34 PM
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Correct me if I'm wrong, but I believe it is meant to disable vacuum advance unless you're in 4th gear.

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Old Apr 9, 2009 | 09:54 PM
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Is it the TCS (Transmission Controlled Spark) solenoid? It eliminates the vacuum advance in low gears when the engine is hot but is overridden when the engine is cold and allows full vacuum to the distributor.
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Old Apr 10, 2009 | 12:03 AM
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Soooo.should I be concerned that its obviously broken and dangling. What effects could I look for. Seems to run ok.
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Old Apr 10, 2009 | 07:07 AM
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Don't say it's broken, maybe just needs hooked up. Look for the plug dangling (not sure where it mounts, an assembly manual would be helpful here), and a vacuum line, probably still works and just disconnected.......................B
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Old Apr 10, 2009 | 08:14 AM
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Originally Posted by fhickey
Soooo.should I be concerned that its obviously broken and dangling. What effects could I look for. Seems to run ok.
Mine wasn't on the car when I bought it and I never reinstalled it when I did the restoration. My vacuum is connected directly to the distributor and it runs fine.
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Old Apr 10, 2009 | 08:25 AM
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Originally Posted by RMVette
Mine wasn't on the car when I bought it and I never reinstalled it when I did the restoration. My vacuum is connected directly to the distributor and it runs fine.
Same here.
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Old Apr 10, 2009 | 08:38 AM
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Originally Posted by RMVette
Mine wasn't on the car when I bought it and I never reinstalled it when I did the restoration. My vacuum is connected directly to the distributor and it runs fine.
Runs better w/o it!
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Old Apr 10, 2009 | 12:54 PM
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Thanks for all the insight. I am definitely getting an assembly manual. Thanks again
Frank
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Old Apr 10, 2009 | 01:29 PM
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This explains the TCS/CEC system.

http://forums.corvetteforum.com/c3-t...-cec-help.html
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Old Apr 10, 2009 | 04:32 PM
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FYI-Here's where it mounts on a 70. Might be same for your year.
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