? about LS-5 motor
Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
Re: ? about LS-5 motor (71stingraybigblock)
It is a thermal switch, think is either spark control or emmissions related but am unsure.
http://www.zip-products.com/Corvette...4E8DD730A89370
[Modified by Fevre, 10:20 AM 4/20/2004]
http://www.zip-products.com/Corvette...4E8DD730A89370
[Modified by Fevre, 10:20 AM 4/20/2004]
Race Director
Joined: Sep 1999
Posts: 11,360
Likes: 382
From: Plano TX
Re: ? about LS-5 motor (71stingraybigblock)
Going from hazy memory, but that sounds like the TCS (transmission controlled spark) switch. It was a funky early emissions system. It prevented vacuum advance in the distributor in lower gears. Only 4th got vacuum advance. The system was only active when the engine was warm, thus the need for the temp switch.
Thread Starter
Racer
Joined: Jan 2002
Posts: 293
Likes: 0
From: carson Missouri
Re: ? about LS-5 motor (72ls5fla)
I was thinking of using this spot for the thermostat switch for spal fans. What would be the effect of removing it? I currently have the vaccum advance plugged.
Race Director
Joined: Sep 1999
Posts: 11,360
Likes: 382
From: Plano TX
Re: ? about LS-5 motor (71stingraybigblock)
Why do you have it plugged? The engine runs better with vacuum advance. You can remove the TCS switch and use it for the spals. The TCS system was a pretty ineffective emissions device and you'll never miss it. Hook the distributor vacuum can directly to a ported vacuum source on your carb.
Instructor
Joined: Nov 2001
Posts: 111
Likes: 0
From: St. Paul MN
Re: ? about LS-5 motor (zwede)
Going from hazy memory, but that sounds like the TCS (transmission controlled spark) switch. It was a funky early emissions system. It prevented vacuum advance in the distributor in lower gears. Only 4th got vacuum advance. The system was only active when the engine was warm, thus the need for the temp switch.
Thread Starter
Racer
Joined: Jan 2002
Posts: 293
Likes: 0
From: carson Missouri
Re: ? about LS-5 motor (LS-5 71)
I am not sure why its plugged, but it is. Since I have had this vette I have done very little under the hood. I have only spent time and money on the suspension. 2005 will be interior and engine performance upgrade year. When I get home I will pull the TCS sensor and install Spal thermostat switch and reconnect vaccum advance. I have been struggling with a good place to connect the thermo switch and this solution solves a couple of issues. Thanks GANG :hurray:
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