Trouble code headache
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Junior Member
Joined: Mar 2014
Posts: 70
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Car: 1991 Pontiac Firebird Formula
Engine: 305 5.0 TBI
Trouble code headache
I keep getting code 23. I have reset the computer memory and it keeps coming back. I cannot find a definitive answer anywhere as to what it is so i was wondering if you guys had any ideas. Thanks all
Joined: Nov 2010
Posts: 5,892
Likes: 84
From: Mantua NJ
Car: 1 Owner 1986 TA with a WS6 package
Engine: 5.0 EFI
Transmission: THM700R4
Axle/Gears: 277 Posi Speedo
Re: Trouble code headache
Check your Manifold Air Temp Sensor (MAT) That will give you the code 23.Resetting doesn't fix it.
Thread Starter
Junior Member
Joined: Mar 2014
Posts: 70
Likes: 0
Car: 1991 Pontiac Firebird Formula
Engine: 305 5.0 TBI
Re: Trouble code headache
Ok which one is that exactly? Is that the one that hangs off the cowling over the AC system or is that somewhere on the intake?
Joined: Nov 2010
Posts: 5,892
Likes: 84
From: Mantua NJ
Car: 1 Owner 1986 TA with a WS6 package
Engine: 5.0 EFI
Transmission: THM700R4
Axle/Gears: 277 Posi Speedo
Re: Trouble code headache
I never had any experience with a MAT Sensor, here's a diagram,it says it's the the Air Cleaner.
Thread Starter
Junior Member
Joined: Mar 2014
Posts: 70
Likes: 0
Car: 1991 Pontiac Firebird Formula
Engine: 305 5.0 TBI
Re: Trouble code headache
ok i changed out that sensor but the code is still there..even reset the memory again just to be sure...code 23 again...grrrr
Joined: Nov 2008
Posts: 2,097
Likes: 177
From: Milwaukee
Car: 92 Firebird, 77 Trans Am SE, 86 Z28
Engine: 5.7 HSR, T/A 6.6, empty
Transmission: T-5, TH350, T-5
Axle/Gears: 3.08 posi, 3.23 posi, 3.23
Re: Trouble code headache
http://www.chevythunder.com/mat_code_23.htm
This should help. Start troubleshooting. Replacing parts blindly usually just costs you money.
This should help. Start troubleshooting. Replacing parts blindly usually just costs you money.
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