Ok what is it? I have totally rewired my 92 bird
& converted the steering to r/h drive
but now I'm stumped.
What is this Thermo/temp? THING!.
It was located just behind the cat & I also don't know
what this black box is, the car runs fine but I am
still non the wiser.

 

Whatever it is it looks aftermarket. It doesn't have the GM Weatherpak connectors on it so I assume its not a GM part.

Maybe it was a daytime running light module?

 

I don't think the DRL module would be behind the cat though. I dunno what that is..

 

Looks like an exhaust temp monitoring system. The threaded piece is an immersion thermocouple and looks like it was in the exhaust stream.

 

(Morley) Yeah the threaded end was into the pipe a few inches behind the cat & the wires ran under the car & up to the engine bay L/H side but not connected to any thing. I'm just asuming the module & wires connected to it as when I got the car it was totally stripped inside but the 2 wires from the module had tape on them that read "goes to black & red".
If its sometype of temp reading thing what do you need it for? & I guess how the hell do you read it & where do the wires go to?. Man I'm confused. The car was registered in RICE LAND before I got it so maybe it was a WOK cooking temp thing

 

Some people use the temp system to tune engines and some use them to tell where to put the X-over pipe in a dual exhaust set up.
Depending on the device used to read the thermocouple it may not have been wired into the car. The thermocouples are a bimetallic type made of alumel and cromel, when heated the metals generate a small electrical charge proporationate to the heat applied, which can easily be read by an analog meter that requires very little power to operate.

 

ROLTF

 

Well that explains a lot of it and I think Morley is correct about the temp sensor. When I was stationed in Japan I noticed a similar looking sensor on my friend's Skyline when we were installing an off road downpipe. It was located near the cat...it must be a Japanese emissions thing but a lot of folks used to leave them disconnectected whenever they removed the cat. I don't think it did any harm to the cars though and ran fine without it. On some cars like the RX7 it turned on the engine light if disconnected.