1970 LS5 TCS Photo request
Thread Starter
Burning Brakes
Joined: May 2008
Posts: 1,165
Likes: 24
From: Boston MA
1970 LS5 TCS Photo request
I was hoping someone could post a few pictures of the original TCS system on there LS5, I want to see the proper method for plumbing the wiring, and I am not sure exactly where the temperature sender is mounted.
Thanks for the help!
Thanks for the help!
Safety Car
Joined: Apr 2000
Posts: 3,802
Likes: 61
From: Wichita KS
There should be a TCS two post flat connector near the distributor that plugs into the TCS solenoid which is mounted on an intake manifold bolt on the passenger side.
Finally, there is a single black wire that plugs into a switch on the bottom of the 3-4 shift lever housing on the transmission. It provides a ground to the TCS system when the car is shifted into 4th gear.
Sorry I don't have any pictures of a 1970 TCS set up but here is a picture of the temperature sensor and the wire pigtail so I hope this helps.
cc
Sensor:
Pigtail:
Last edited by CCrane65; Mar 22, 2009 at 11:29 PM.
Burning Brakes
Joined: Jan 2009
Posts: 1,224
Likes: 1
From: Clarksville Indiana
Is this part of the system needed or important? any downside to it being missing/inop? I have 2 small relays? on the firewall just next to the b/booster box/emission sticker. are they part of it? thanks
Safety Car
Joined: Apr 2000
Posts: 3,802
Likes: 61
From: Wichita KS
They are part of the emission control system. They really didn't do anything to reduce emissions but it was all the technology that was available at the time.
The TCS system blocks vacuum advance until the transmission is in 4th gear for manual transmissions and final drive gear for automatics. The relay comes into play when the car is first started and provides a 20-30 second delay in TCS activation to allow the temperature sensor to provide feedback on whether the engine is below 80 degrees (advance allowed) or above 220 degrees (advance allowed) then advance is blocked until the transmission is in high gear.
cc
Team Owner
Joined: Jan 2006
Posts: 37,637
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From: Crossville TN
The whole purpose of the TCS system was to shut down the dist. vacuum advance until your tranny was in the higher gear ranges. So, at the expense of engine performance, fuel economy, and engine life you could hook it all back up. Or, you could wire/plumb it all per factory...but swap a couple of hoses so that the vacuum advance is always working, then swap it back for emissions testing and/or car show. [That's what I've done on my '71 SB].
Safety Car
Joined: Apr 2000
Posts: 3,802
Likes: 61
From: Wichita KS
So, at the expense of engine performance, fuel economy, and engine life you could hook it all back up. Or, you could wire/plumb it all per factory...but swap a couple of hoses so that the vacuum advance is always working, then swap it back for emissions testing and/or car show. [That's what I've done on my '71 SB].
cc
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Team Owner
Joined: Jan 2006
Posts: 37,637
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From: Crossville TN
Anytime you inhibit the vacuum advance from working [at idle, particularly], the engine will run hotter, which will impact engine life. That's the intent, actually, since a warmer engine will burn off more 'excess' hydrocarbons. {That's also why vehicles have 195F thermostats now.} If yours hasn't been impacted, then I suspect that the system just is not operational...even though it is "hooked up". You can determine whether it is working or not by checking your ignition timing and seeing if it is advancing [or not] at idle. P.S. I was merely attempting to provide you with some background on the system for the original poster.
Last edited by 7T1vette; Mar 23, 2009 at 03:27 PM.
Thread Starter
Burning Brakes
Joined: May 2008
Posts: 1,165
Likes: 24
From: Boston MA
Thanks for the help guys...when the engine was replace in my car the PO did not bother installing this particular system. I have the connectors tucked away by my washer bottle hose. My intent was to put all of the pieces of the system in place, and like 7T1 said, bypass the vacuum solenoid for driving, and at a show plug it in.
I just wanted pictures of an engine bay with everything hooked up to make sure I get things where they belong, routing of harness, and hoses, etc....I could probably get it in the AIM, but a real picture would be very helpful.
I just wanted pictures of an engine bay with everything hooked up to make sure I get things where they belong, routing of harness, and hoses, etc....I could probably get it in the AIM, but a real picture would be very helpful.
Safety Car
Joined: Apr 2000
Posts: 3,802
Likes: 61
From: Wichita KS
Anytime you inhibit the vacuum advance from working [at idle, particularly], the engine will run hotter, which will impact engine life. That's the intent, actually, since a warmer engine will burn off more 'excess' hydrocarbons. {That's also why vehicles have 195F thermostats now.} If yours hasn't been impacted, then I suspect that the system just is not operational...even though it is "hooked up". You can determine whether it is working or not by checking your ignition timing and seeing if it is advancing [or not] at idle. P.S. I was merely attempting to provide you with some background on the system for the original poster.
Now these may not be what the system is supposed to do but it is definitely functioning.
cc
Instructor
Joined: Apr 2007
Posts: 199
Likes: 2
From: Suffern NY
Thanks for the help guys...when the engine was replace in my car the PO did not bother installing this particular system. I have the connectors tucked away by my washer bottle hose. My intent was to put all of the pieces of the system in place, and like 7T1 said, bypass the vacuum solenoid for driving, and at a show plug it in.
I just wanted pictures of an engine bay with everything hooked up to make sure I get things where they belong, routing of harness, and hoses, etc....I could probably get it in the AIM, but a real picture would be very helpful.
I just wanted pictures of an engine bay with everything hooked up to make sure I get things where they belong, routing of harness, and hoses, etc....I could probably get it in the AIM, but a real picture would be very helpful.
