Can someone tell me where is the MAT sensor on my car. And where can I get kit to relocate it. I believe I read somewhere it would be best to put in between MAF and throttle body is this true? Thanks for any info.

 

what is a mat sensor anyway? what does it do?

 

The MAT sensor (or manifold air temp sensor) is mounted into the plenum (on TPI) toward the back, left side. Basically, this sensor tells the computer what temp incoming air is. Not entirely sure what all it affects. I am sure someone else can answer that one.

 

On the drivers side in the back of the plenum there is a hose for the power brakes. On the passenger side there are two fittings one goes to fuel regulator and I do not know what the other one is.

 

I'ts underneath the plenium in the back.

 

read both these articles:
http://members.aol.com/mmmm999/3rd-degree/tips/mat.htm

http://www.racer-x.f2s.com/proc/matlearn.htm

 

Whoa, someone quoted something I wrote and never even asked me if it was okay to use in their web page????

Ah, that's okay; I'm kind of flattered.

But there is a few corrections I would say.

1) The MAT does have a function on whether the EGR is able to run (if other conditions are met). If the temperature is below +40*F, you will have to adjust the EGR on temperature. I have lowered mine to keep the EGR enabled to temperatures as low as -30*F.

2) There is a table that you should alter to compensate for the relocated MAT. It is the MAT Inverse Look-up Table. Once you adjust this, your ecm will work perfectly with the relocated MAT and give you the best possible readings. But it requires modifying this table first, which requires you to learn how to burn an eprom. This is something that needs to be played with and no custom eprom writer appears to compensate for.

 

Thanks guys for all the info. But Glenn I live in California I do not see temps below 40 degrees very often and the car is not a daily driver. I have a fastchip so will that be okay if I relocate MAT sensor.

 

You won't have a problem with the EGR (unless you ever travel to the mountains or a cooler climate), but you still are faced with the effects of the MAT on the fuel enrichment.

As for Fastchips, their MAT Inverse Look-up Table looked stock when I looked inside it. So you still will have that problem. You can tune for a range of temperature, but until you correct the table in the eprom, you'll always have to retune for every 20*F change in temperature.