help with code 23
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Supreme Member
Joined: Mar 2000
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From: First one out of liberty city, burn it to the ground
help with code 23
I'm getting a code 23 off my firebird now. I replaced the TPS and the wiring is fine. It also says low pressure at manifold? What the hell does that mean? Ideas? When the SES light comes on like this it makes my car run like total **** and has no power til 3500rpm+
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89 Firebird (AKA "Money")
2.8 V6 w/ t5 tranny (383 tpi t56 12/01)
Flowmaster 80 series, 3" Intermediate, SS Tips, Random Tech Cat, Msd Coil, MSD 6a, Accel 8.8 wires, Cold Air Intake w/ K&N, Lakewood LCA's, Brushed aluminum Hood pins ETC...
Next:
Spohn Torque Arm, Lakewood Panhard bar, BMR Fabrication Sub Frame connectors...
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My Site:
www.geocities.com/firebird89white
" I'd rather run last in a full out race, than to NOT run at all ".
------------------
89 Firebird (AKA "Money")
2.8 V6 w/ t5 tranny (383 tpi t56 12/01)
Flowmaster 80 series, 3" Intermediate, SS Tips, Random Tech Cat, Msd Coil, MSD 6a, Accel 8.8 wires, Cold Air Intake w/ K&N, Lakewood LCA's, Brushed aluminum Hood pins ETC...
Next:
Spohn Torque Arm, Lakewood Panhard bar, BMR Fabrication Sub Frame connectors...
-------------------------
My Site:
www.geocities.com/firebird89white
" I'd rather run last in a full out race, than to NOT run at all ".
Junior Member
Joined: Sep 1999
Posts: 44
Likes: 1
From: Columbus, OH, US
Car: 89 Camaro RS
Engine: V-6
Transmission: Auto
Code 23 on a 89 V-6 is for the Manifold Air Temperature sensor (MAT).. the sensor located in the air filter housing. Just replace that (I remember around $20) and you should be good to go. Same thing happened to me last year.
Thread Starter
Supreme Member
Joined: Mar 2000
Posts: 1,777
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From: First one out of liberty city, burn it to the ground
ok thx glen maybe now its a good time to try the ohm resistor?
------------------
89 Firebird (AKA "Money")
2.8 V6 w/ t5 tranny (383 tpi t56 12/01)
Flowmaster 80 series, 3" Intermediate, SS Tips, Random Tech Cat, Msd Coil, MSD 6a, Accel 8.8 wires, Cold Air Intake w/ K&N, Lakewood LCA's, Brushed aluminum Hood pins ETC...
Next:
Spohn Torque Arm, Lakewood Panhard bar, BMR Fabrication Sub Frame connectors...
-------------------------
My Site:
www.geocities.com/firebird89white
" I'd rather run last in a full out race, than to NOT run at all ".
------------------
89 Firebird (AKA "Money")
2.8 V6 w/ t5 tranny (383 tpi t56 12/01)
Flowmaster 80 series, 3" Intermediate, SS Tips, Random Tech Cat, Msd Coil, MSD 6a, Accel 8.8 wires, Cold Air Intake w/ K&N, Lakewood LCA's, Brushed aluminum Hood pins ETC...
Next:
Spohn Torque Arm, Lakewood Panhard bar, BMR Fabrication Sub Frame connectors...
-------------------------
My Site:
www.geocities.com/firebird89white
" I'd rather run last in a full out race, than to NOT run at all ".
TGO Supporter
Joined: Jul 1999
Posts: 10,907
Likes: 5
From: The Bone Yard
Car: Death Mobile
Engine: 666 c.i.
Code 23 is low temperature for the MAT.
This represents an open/broken circuit or an inoperative MAT. Double check the connections (possible reversal also).
I would think twice about using a 4.7 K resistor (55*F) as permanent solution. It will prove whether the circuit is ok though.
As a quick fix to use the car for a short period, its ok. The ecm does need to get the correct air temperature to adjust the injectors to the proper pulse width. If it didn't, GM would never have used the MAT in the first place.
I could go into a long explanation, but I have written this stuff too many times. Read some of the older posts regarding relocated MAT and pulse widths (one on this board, another on the TPI board and a couple discussions on the PROM board). You'll learn more about the MAT that you probably care to know about.
[This message has been edited by Glenn91L98GTA (edited January 21, 2001).]
This represents an open/broken circuit or an inoperative MAT. Double check the connections (possible reversal also).
I would think twice about using a 4.7 K resistor (55*F) as permanent solution. It will prove whether the circuit is ok though.
As a quick fix to use the car for a short period, its ok. The ecm does need to get the correct air temperature to adjust the injectors to the proper pulse width. If it didn't, GM would never have used the MAT in the first place.
I could go into a long explanation, but I have written this stuff too many times. Read some of the older posts regarding relocated MAT and pulse widths (one on this board, another on the TPI board and a couple discussions on the PROM board). You'll learn more about the MAT that you probably care to know about.
[This message has been edited by Glenn91L98GTA (edited January 21, 2001).]
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