Problem with my 1997 CHEVY LUMINA CHECK ENGINE LIGHT
Codes = EGR VALVE. REPLACED EGR VALVE, CODE WENT OFF FOR 1 DAY OR 2 THEN
CAME BACK ON.
Question: I HAVE A 1997 CHEVY LUMINA, GAS TANK HAS A LEAK IN IT. ANYTHING OVER 1/2
TANK DRIPS OUT. CHECK ENGINE LIGHT IS ON, COMPUTER SAID EGR
VALVE NEEDED TO BE REPLACE. I REPLACED, LIGHT WENT OFF. 2 DAYS LATER LIGHT
BACK ON. COMPUTER STILL SAYS EGR VALVE. COULD THE SMALL GAS  LEAK BE CAUSED
FUMES TO SET OFF THE EGR VALVE SENSOR?


Answer:
Probable cause for this code, assuming the wiring at the valve is good is a plugged EGR
passage. There is a passage under the EGR valve that goes into  the upper intake manifold, just
beyond the throttle plate. This gets plugged with  carbon, and does not allow the EGR to
function properly, thus giving the code.
The exhaust gas recirculation (EGR) system is used to lower oxides of nitrogen (NOx) emission
levels caused by high combustion temperature. It does this by decreasing  combustion
temperature.

The main element of the system is the EGR valve. The EGR valve feeds small  amounts of
exhaust gas back into the combustion chamber. With the fuel/air mixture thus diluted,
combustion temperatures are reduced.

If a problem with the EGR system will not allow the PCM to control pintle position  properly, DTC
P0404 should set. The PCM also tests for EGR flow. If incorrect flow is detected, DTC P0401
should set. See
DTC list for other EGR codes.
1992 Chevy Lumina Engine size  3.1L. Service Engine codes  DTC23.
This vehicle was bought with the prior owner Never doing maintenance on it. Was running fine now
is giving a code of DTC23 Intake Air Temp. Any ideas? Where is this sensor located?
Answer:
The
intake air temperature sensor is located on the intake air duct between the air filter and the
throttle. It is a 2 wire sensor. If any work has been done to your Lumina recently, they may have
just left it unplugged. If that is OK, check that there are no broken wires right at the connector
before replacement. This is common on that engine for the wires to stretch and break. If they are
OK, then yes, replace the temperature sensor.
3.1L intake air temperature sensor location

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Chevy Lumina EGR Code And Intake Sensor Location