C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

TPI Sensor?

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Old Apr 20, 2015 | 03:55 PM
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Default TPI Sensor?

Anybody know what this sensor is for? ('87 vette)


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Old Apr 20, 2015 | 04:03 PM
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Coolant Temperature Sensor.
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Old Apr 20, 2015 | 04:25 PM
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Originally Posted by DanielRicany
Coolant Temperature Sensor.
I thought the sensor I removed from the hole left to sensor in question was the CTS? They both go into the coolant.
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Old Apr 20, 2015 | 04:50 PM
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One is a Coolant Temperature Sensor, the other is a Thermo Time Switch.
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Old Apr 20, 2015 | 07:56 PM
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Do you have a cold start injector ?
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Old Apr 20, 2015 | 08:55 PM
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[QUOTE=Ronaldo;1589458994]Anybody know what this sensor is for? ('87 vette)QUOTE]

DITTO - Coolant Temp Switch.

Yes 87 should have a Cold Start Injector unless already deleted.


Beerme!
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Old Apr 21, 2015 | 02:05 AM
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Does that mean that this sensor is not needed when the cold start injector is deleted?

The sensor is stuck and cracked when I tried to remove it. I'm switching to a FIRST manifold with no cold start injector.
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Old Apr 21, 2015 | 03:55 AM
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Originally Posted by Ronaldo
Does that mean that this sensor is not needed when the cold start injector is deleted?

The sensor is stuck and cracked when I tried to remove it. I'm switching to a FIRST manifold with no cold start injector.
Sensor is needed regardless of cold start injector. The sensor sends temp data to ecm which activates fans based upon temp parameters.


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Old Apr 21, 2015 | 06:56 AM
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Originally Posted by beerme
Sensor is needed regardless of cold start injector. The sensor sends temp data to ecm which activates fans based upon temp parameters.


Beerme!
Are you meaning the CTS or the TTS?

If the Thermo Time Switch is only used as described in this thread, then it should not be necessary or?

https://www.corvetteforum.com/forums...re-sensor.html

Quote from above link

Originally Posted by DanielRicany
The one on the left is a Thermo Time Switch. This is used for the Cold Start Injector. This switch is closed for 8 seconds on a cold start and then it is open for the rest of the time.

The one to the right is the Coolant Temperature Sensor, this sensor reports directly to the ECM.
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Old Apr 21, 2015 | 08:08 AM
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They look very similar from the outside. Post a picture of the one you already removed and I can tell you if it is the CTS or TTS.

Sometimes they will get switched around during previous repairs.
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Old Apr 24, 2015 | 07:57 AM
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Originally Posted by DanielRicany
They look very similar from the outside. Post a picture of the one you already removed and I can tell you if it is the CTS or TTS.

Sometimes they will get switched around during previous repairs.
Thanks, from the information you gave this would be the TTS, right? (below 35 degress C, on for 8 seconds?)


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Old Apr 24, 2015 | 09:13 AM
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Originally Posted by Ronaldo
Thanks, from the information you gave this would be the TTS, right? (below 35 degress C, on for 8 seconds?)


Yes, that is the TTS.
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Old Apr 25, 2015 | 01:26 AM
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The easiest way to tell it's a TTS is that it has the same connector as a fuel injector.
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