ok, this weekend i replaced the coolent temp sensor, and while i was taking it out, i had to unplug this other sensor to the left of the CTS. they both seem to look like they screw into the coolent path. (front of the engine) but this one has a a BIG plug going into it, and the harness looks like that of a fuel injector harness, expect alot bigger, i have lose my chiltons manual, and my TPI swappers guide doesnt say what it is, so what the heck is this thing? is it a fan switch maybe?

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- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series

http://www.geocities.com/david_angel_16

 

That is a temperature switch that controls the cold start injector.

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1987 GTA L98 MD8
355, TFS Heads, LT4 Hot Cam
My GTA

The Minnesota F-body Club

 

Matt is on it. It is a basic analog temperature sensor with a simple timer device driving an output switch. The timer will allow a closure of the switch for up to eight seconds if the sensed coolant temperature is low enough. This varies the time that the cold start valve operates on cold engine starts.

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Later,
Vader
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If you want to beat the World, it might reach up and pull you down...
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