I found an unhooked sensor on the plastic air piece, what is it for? I cannot find a loose sensor wire anywhere. Some one told me its for an ambient temperature sensor, but did a 1989 camaro with a stock L98 come with one? I already have a MAF sensor for the air.

 

That's the IAT or intake air temp sensor. Not sure where the plug comes from on yours though.

 

Thats what i am trying to figure out. Maybe someone took this air piece from a v6 camaro.

 

It's in the wiring diagram. Should be a plug with a tan and a black wire. Might be plugged in to a sensor that's been moved or it would set off the SES light wouldn't it?

 

From the factory the IAT / MAT sensor was under the plenum between the runners and had a 2 wire plug coming out of the main harness on firewall.
To be fitted where yours is now , PO would have had to make or buy the extension harness to connect to that plug

 

If you have the TPI, your IAT sensor is on the bottom of the plenum above the intake manifold to the rear.

 

I don't know where the IAT for the TBI IROC is. Probably there in the intake.

 

This is probably a newer (91-92) intake that has replaced your original and the sensor was left there to keep the hole plugged. look under your drivers side plenum and you should see the same sensor screwed in under neath with a plug in it.

 

I think all TPI had it in plenum but moving the IAT sensor to the plastic air intake is a common trick. It senses cooler air there and provides minimal performance enhancement.

 

Interesting, that may be a reason why the previous owner may of taken this from another camaro.

 

Mystery solved, I found the IAT sensor underneath the front of the plenum. I tried to see if it the wire would reach the plastic intake sensor, but it's too short. Thank you all for the help, now I feel relived.

 

This one?

 

All TPIs use a MAT sensor (manifold air temp) in the manifold
V6 and TTA turbo V6 used a IAT (intake air temp) in the intake plastics

the plastic Y pipe you have is a replacement from a V6 car. (not a big deal unless your doing a 100% resto)

 

Yup, that's it. I followed the tan and black wire to find it. In the process of finding it,
i found some sort of animal nest under the plenum.

 

WRONG

That is a identical sensor used for a different purpose.
It is the coolant temperature sensor (CTS )

DO NOT disconnect that sensor
IAT you are looking for is as stated underneath the plenum between the runners

 

your kidding me, the connectors look almost identical. Now i am going to have to pull apart the nest between the runners.

 

I found it, it's underneath the bottom of the back of the plenum.

 

The connectors ARE identical. The sensor is basically a universal thermal sensor. All its purpose is to read the temperature its screwed into whether its air or water. I use the same sensor x2 with my aftermarket efi for the same purpose.

 

TPI cars have a plug there where v6 cars have a sensor there.maybe some PO played mix n match?

 

can someone please help me with what these sensors are in the pic its sideway but its the top sensor it has a grey nipple on the top looks like its for a vacumn line and its got a broken spot for a two wire plug i have the wires and plug but i cant find out what the sensor is and the second sensor is the one thats located on the botton of the front of the intake manifold the top is broken off it looks like it had a metal prong conneted to the top of it i have the prong part of it but the sensor i broken in two and i cant find out what senor it is it looks blue in the pic right above the hose

well i thought i was going to upload a pic but i cant seem to do so

 

i think i got the pic to post
i straightened the pic its now the one on the right and the blue colored one at the botton left
pleae help its a 87 camaro with a 305 carbed 4 barrel

 

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