I've always had a code 23, and when I looked it up I found that it was the manifold air temp sensor. Isn't that the sensor right next to the coolant neck?

Anyway I replaced that, and I still have the code. Any help? Did I replace the wrong thing?

 

Alright After doing a little bit of googeling...I realized I did not replace the MAT sensor.

What is the MAT sensor? Where is it? Is it the air temp sensor in the air cleaner (in my case)? If it is, I have one in there. When I bought it it was called an air charge temperature sensor. It's basically the same thing from what I've seen.

 

yes, MAT = IAT = air charge temp sensor.

 

Alright, so if it's the right thing, why am I getting a code?

 

keep in mind it's been a while since i've been near a TBI motor, but code 23 sets when the engine has been running for at least 5 minutes and for at least 12 seconds after that, it shows -22*F.

it will also set due to the wiring between the ECM and sensor being open(infinite resistance).

also, you did clear the code before installing the new one, correct?

 

just for good measure, here is a diagram of where the IAT is located.

 

Well I don't have the stock air cleaner set up,I have just an air cleaner. I installed the air charge sensor I was talking about in that.

I removed the ecm fuse for about 20 seconds to clear it. That was a while ago. I installed the sensor a LONG time ago. (months) and I always thought it was that other thing I replaced. I guess not.