as the sub. says i got error code 23 on my 87 GT and my mat sensor is located on the right side of the engine next to the upper intake manifold? correct me if im wrong. its a little black box right? what should i do to fix the problem with out going out and replacing it right away. if i must replace it how much is it?

Thanks
Josh
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1987 Black GT with BIG plans

[This message has been edited by Celthora87GT (edited 01-18-2011).]

MAT is the Manifold Air Temperature sensor on the can of the air cleaner.

Make sure it's plugged in

On the side of this




The thing I had posted before was the MAP. Your trouble is with the MAT. Most likely unplugged

[This message has been edited by phonedawgz (edited 01-18-2011).]

disconnected battery and still on. but the car still runs like a champ but idles high when cold started. 2000 rpm high then it works its way back down to 1000 when at running temp. and my gauge on my dash for the temp is funky it fluctuates alot. never going over just going from whats looks like 140 to normal temp

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1987 Black GT with BIG plans

quote Originally posted by Celthora87GT: 2000 rpm high then it works its way back down to 1000 when at running temp.

Standard operation for the 2.8

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quote Code 23 - MAT Low Trouble Code 23 indicates that the Manifold Air Temperature (MAT) sensor is reporting abnormally low readings. When the air is cold, the thermistor in the sensor has a high resistance, which falls as the air charge warms. Low readings indicate a possible bad sensor or open in the MAT circuit. The conditions for setting this code are: MAT reading is < -40 deg F (-40 deg C) NOTE: A default MAT value indicating 82 deg F is used while Code 23 is present. Typical thermistor resistance values are: deg F deg C Resistance (ohms) 210 100 185 160 70 450 100 38 1,800 70 20 3,400 40 4 7,500 20 -7 13,500 0 -18 25,000 -40 -40 100,000+ Typical causes for this code include: Defective MAT sensor Open sensor ground circuit MAT sensor unplugged Dirty or corroded connection(s) at MAT and/or ECM Open circuit between the ECM and the MAT sensor Defective ECM

[This message has been edited by phonedawgz (edited 01-18-2011).]

alright thank you very much. i guess i will just check my codes every couple of weeks to see if the codes have changed. and i will just have to stare at that SES light oh well. not like its is making a difference on the performance.

I don't suppose you were messing around with a 'cold air intake' eh?

btw, the stock can is ducted so cold air comes into it. A filter under the rear deck lid will suck in engine warmed air.

Oh. well currently i have the air canister off and the black rubber hose off and its just an open throttle body. i know its not the best for the engine to run on an open throttle body. but im painting the canister and im not driving it im just having it run in my garage with the tail pipes sticking out of the garage. Could the low temps and the open throttle body be the issue?. and im tapping off the throttle body when not in use so it dosent get crappy inside the throttle body and the upper intake manifold.

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1987 Black GT with BIG plans

The missing Manifold Air Temperature sensor that is in your garage instead of your Fiero makes the ECM read the outside air temperature at -40 deg. Luckly the ECM is programmed to substitue 82 degrees when it sees the air temp so way out of wack. Of course since the air temp isn't 82, it still won't run quite right.

You could take the sensor off the can and plug it back into the electrical harness untill you are finished, and then put it back into the can like it is supposed to be.

That will make your code 23 go away.

Reset the ECM after reconnecting the MAT

[This message has been edited by phonedawgz (edited 01-18-2011).]

that make a crap ton of sense. thank you so much. forgot that i unplugged that sensor when i took the canister off.
Thanks
Josh
btw off topic but how do you think the packers are going to do vs the bears?

MAT is Manifold Air Temperature sensor, MAP (Manifold Absolute Pressure sensor) is what is in the picture and the part you are describing. The MAT will be mounted on the air cleaner housing.


Guess I was just too slow tonight . . . . figures.

[This message has been edited by 86FieroSEv6 (edited 01-18-2011).]

thanks 86Fiero. i will go unscrew the sensor right now and test it out to see if it works

Same thing the Pack did to the Bears 3 weeks ago. It just will be more exciting.



Matthews is saying "You're my ***** "

[This message has been edited by phonedawgz (edited 01-18-2011).]

did we win that game? i didnt watch it i had a swim meet and it fixed my problem now no more SES light!!!! yayy also what color looks the best? red or black?

quote Originally posted by Celthora87GT: did we win that game? i didnt watch it i had a swim meet and it fixed my problem now no more SES light!!!! yayy also what color looks the best? red or black?

Did we win that game? - Remind me to come down there and kick your a** - swim meet or not. I can understand not watching the game, but to not know the score?!

Satin Black - Red makes it look like a circus

The Bears had nothing to gain by winning execpt to keep the Packers out of the playoffs. Usually a coach would play reserved and save his best players for the playoff games. The Bears played their starters all game to try and keep the Pack out. They didn't. And now were coming back to kick butt again.

[This message has been edited by phonedawgz (edited 01-18-2011).]

dont worry im watching the Packers Vs Bears this weekend!!! im a huge fan i just missed that game and i kinda forgot about it how would i take the rust off and make it smooth? just sanding?

Wire wheel on a bench grinder is a good way to clean most of the rust off. It won't get into the rust pores but it will get most of the rust off.

ALWAYS wear safety glasses when using a wire wheel. The wire pieces WILL come off and sooner or later one WILL hit you in the eye.



Fleet Farm has them. The braided ones work faster than just the regular ones.



The yellow safety glasses are the best

[This message has been edited by phonedawgz (edited 01-18-2011).]

well looks like im taking a trip to grandpas. I dont own a bench grinder. in fact i dont own many tools. i wish i had one of those MAC trucks lol a truck full of tools.

Recorded before they started adding "We love it"

Song by the same people who did "the bears still suck'

Yeah Fleet Farm uses it for their commercials now

"The Happy Schnapps Combo"

[This message has been edited by phonedawgz (edited 01-18-2011).]

Is that at summerfest? that was funny. Do you just have a huge hardrive full of funny things and pics of every different part imaginable?

Google Image Search



http://www.google.com/image...m&aq=f&aqi=&aql=&oq=

[This message has been edited by phonedawgz (edited 01-18-2011).]

quote Originally posted by phonedawgz: Google Image Search http://www.google.com/image...m&aq=f&aqi=&aql=&oq=

hey look at that lol im the one behind the big egg headed olf who is in front with the letter jacket on.
the one looking to the right side of the pic
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1987 Black GT with BIG plans

[This message has been edited by Celthora87GT (edited 01-18-2011).]

IC

Thats down at the NAT in Madison?

I know a kid (grad student at Minnesota now) who swam on the state level for all 4 years. He swam for Ashwaubenon

Eric Matzke. His younger brother Nick is in school and swims also. Big swimming family. I was at the NAT to watch Eric swim

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Oh wait - you guys have hair - that can't be at the NAT

[This message has been edited by phonedawgz (edited 01-18-2011).]

No this picture was taken last year as in 2009. well yeah it says that on the picture. it was taken by my mother. and it is in Delevan. at the Delevan Darian invite which is held in early December. State not NAT is in Madison on i think February 14

I meant the natatorium on
UW Mad campus

Was totally weird there seeing all these guys in shaved heads. It makes it really hard to pick out who is who.

[This message has been edited by phonedawgz (edited 01-18-2011).]