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Join Date: Aug 2006
Location: SoFLA
Posts: 5,536
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3.0 ROW w/CIS...is thermotime switch necessary?
I was checking my wiring connections in the engine compartment and one terminal of the thermotime switch came off in my hand. It appears it was hanging on by a thread for a long time (dirt/grease underneath where the broken terminal used to reside).
Question is: Will the car run OK without the switch hooked up? Can/should I short the two leads together temporarily? I have a car show this weekend (about 1 mile away) and don't have time to track down the part & replace. Also...what is the difference between the thermotime switch and the temp sensor? They both look like they do the same thing... 
Last edited by Danny_Ocean; 04-17-2007 at 02:24 PM.. |
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04-17-2007, 02:16 PM
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Designer King
Join Date: Mar 2004
Location: Toronto, ON Canada
Posts: 5,499
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The thermotime Switch "tells" the CSV how long to fire for cold starts. Since you are in CA you may not need this. Does the engine start?
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Paul Yellow 77 Sunroof Coupe/cork interior; 3.2L SS '80 engine/10.3:1/No O2; Carrera Tensioners; 11 Blade Fan; Turbo tie rods; Bilstein B6; 28 tube Cooler; SSI, Dansk; MSD/Blaster; 16x7" Fuchs/205/50 Firestone Firehawk Indy 500s; PCA/UCR, MID9 Never leave well enough alone |
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04-17-2007, 02:25 PM
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I am in FLA now...80's all week.
I just "re-assembled" the switch by pressing in the broken terminal on a vice with soft-caps. Re-installed and now my "surge on cold start" problem went away! Car runs fine. Worst case scenario...the switch falls apart again while driving. Will I be stranded? |
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04-17-2007, 02:55 PM
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TTS Coming Off.......
Danny,
You just need the thermotime switch (TTS) for cold starting. It works like a few seconds only after a cold start. Once the car is running, the TTS could be dislodged or disconnected without any adverse effect on your motor. As long as the temp. in Florida stays above 60F, you should have no problem driving the car around. Hope this gives you some confidence and enjoy driving the car. Tony |
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04-17-2007, 03:32 PM
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No, you will not be stranded. Whatever you do, do not connect the wires together. The thermotime switch a device to disconnect the cold start valve when hot and when the engine doesn't start after extended cranking. The temp sensor is just a variable resistor. The red/black wire is the ground connection for the cold start valve, the yellow wire is +12volts (only when cranking) to heat up the element and break the ground connection if the engine doesn't start. If the switch breaks apart, you can just insulate the yellow wire and ground the red/black wire only when you need it for a cold start. If you leave the red/black wire grounded, the CSV will spray on a hot start, possibly flooding the engine.
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04-17-2007, 03:46 PM
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OK. Thanks all.
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04-17-2007, 05:03 PM
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if the switch is not working right and the motor is cold it may be more difficult to start.
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04-17-2007, 05:50 PM
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Before I discovered the loose terminal, the motor would surge upon start-up for a few moments. Now that I did a temp-fix, the surging on cold start-up has gone away...
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04-17-2007, 06:44 PM
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The cold start valve gets its power from the starter terminal only when the key is in the Start position. Once you release the key to the On position, it is out of the picture, although cold engines love richness and it can effect transition to cold running for 1 or 2 seconds. Perhaps the red/black wire was not making contact with ground, check it with a meter, it should be grounded cold.
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Paul |
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04-18-2007, 01:18 AM
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