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.
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