How an EGR Valve Works
An EGR (exhaust gas re-circulation) valve is designed to lower NOX (NO2) gases
that occur in the combustion chamber when temperatures reach over 3,500 degrees
Fahrenheit. NOX gases have been proven to cause brain damage in humans, therefore
EGR valves have been mandatory on most vehicles since 1976. An EGR valve controls
exhaust gases and allows them to
enter the intake manifold and flow into the
combustion chamber at certain times
in the operation of the vehicle to reduce combustion chamber temperatures.
Electrically Operated EGR Valve (Linear)
Vacuum Operated EGR ValveTo test your vacuum operated EGR valve remove the vacuum line that is connected to the valve, apply vacuum using a vacuum pump to the valve while the engine is running. If the engine stalls the EGR system is working, if not, the EGR valve may have failed or the passages may be plugged with carbon deposits. Testing of a Linear (electric) EGR valve requires a scan tool capable of applying the valve on command.
If further technical assistance is needed, ask our team of certified car repair technicians.Related Car Repair Information
Electrically Operated EGR Valve (Linear)
Vacuum Operated EGR ValveTo test your vacuum operated EGR valve remove the vacuum line that is connected to the valve, apply vacuum using a vacuum pump to the valve while the engine is running. If the engine stalls the EGR system is working, if not, the EGR valve may have failed or the passages may be plugged with carbon deposits. Testing of a Linear (electric) EGR valve requires a scan tool capable of applying the valve on command.
If further technical assistance is needed, ask our team of certified car repair technicians.Related Car Repair Information