codes 23 and 44

1992 CHEVROLET LUMINA

179,000 MILES • 6 CYL • FWD • AUTOMATIC

NE69CHEVELLE

MEMBER
11 POSTS
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I have a 1992 chevrolet lumina with a 3.1L and it is throwing engine codes 23 and 44. Here's what has been done. New lower intake manifold gaskets, upper plenum, spark plugs fixing leaks and doing tune-up. I didn't have the car long enough to know if it was throwing codes beforehand as I bought it and went straight to work fixing the problems. I replaced the IAC already. What could be going on? thank you

Mar 17, 2011 at 7:37 PM

RASMATAZ

CERTIFIED EXPERT
75,992 POSTS

You have a manifold air temperature and oxygen sensor problem

Chevrolet
13 Open Oxygen Sensor Circuit
14 Coolant Temperature Sensor (High Temp Indicated)
15 Coolant Temperature Sensor (Low Temp Indicated)
21 Throttle Position Sensor (Signal Voltage High)
22 Throttle Position Sensor (Signal Voltage Low)
23 Manifold Air Temperature (MAT) Low Temp Indicated
24 Vehicle Speed Sensor (VSS) Circuit
25 Manifold Air Temperature (MAT) High Temp Indicated
32 Exhaust Gas Recirculation (EGR) Circuit
33 Manifold Absolute Pressure Sensor Circuit (High Sig.)
34 Manifold Absolute Pressure Sensor Circuit (Low Sig.)
42 Electronic Spark Timing (EST) Circuit
43 Electronic Spark Control (ESC) Circuit
44 Oxygen Sensor Circuit (Lean Exhaust Indicated)
45 Oxygen Sensor Circuit (Rich Exhaust Indicated)
51 Faulty PROM
54 Fuel Pump Circuit (Low Voltage)
55 55 ECM Error

Mar 17, 2011 at 7:41 PM

NE69CHEVELLE

MEMBER
11 POSTS

Is the MAT sensor the one in the air box?

Mar 17, 2011 at 7:53 PM

RIVERMIKERAT

CERTIFIED EXPERT
6,110 POSTS

Yes. Apparently facing the rear of the vehicle.

Mar 22, 2011 at 7:00 PM