When to worry about an EGR valve problem?
If the initial reading is in spec but you have a trouble code for this system then it is possible that the system is not flowing when expected (EGR valve, EGR tube, DPFE hoses or control side issue), is flowing when it shouldn’t be (EGR valve or control side issue) or you may have an intermittent concern, possibly even with the DPFE sensor.
How does the EGR pressure feedback sensor work?
When the EGR pressure feedback sensor detects that the pressure is low, it will open up the EGR valve to increase flow, and just the opposite will close the valve if it detects that pressure is too high.
What should the gauge be for the EGR valve?
The gauge should climb up to 5-10 in.hg once or twice during the KOER test. This is because the computer commands the EVR on so the EGR valve will open and then the computer looks for a voltage change on the DPFE sensor. This is how the computer checks operation of this sensor.
Why does my dpfe have a leaking EGR valve?
You now know the DPFE, EGR valve and tube and hoses are okay and we can move on to test the EVR (EGR Vacuum Regulator), part of the system. If the reading did not change, then you could suspect a leaking EGR valve, allowing uncommanded flow of exhaust gases.
What do you need to know about the EGR valve?
These systems are mostly comprised of the EGR valve, a DPFE (Delta Pressure Feedback EGR) sensor, hoses, a vacuum regulator, some vacuum lines, wiring, the computer and the exhaust tube leading to the valve itself.
You now know the DPFE, EGR valve and tube and hoses are okay and we can move on to test the EVR (EGR Vacuum Regulator), part of the system. If the reading did not change, then you could suspect a leaking EGR valve, allowing uncommanded flow of exhaust gases.
What happens if your EGR sensor is bad?
If the EGR pressure sensor sends any false reading to the computer it can cause the EGR system to malfunction. A malfunctioning EGR system can lead to engine performance issues such as rough idle, engine hesitation, and a decrease in overall power and fuel efficiency. 2. Failed emissions test
When the EGR pressure feedback sensor detects that the pressure is low, it will open up the EGR valve to increase flow, and just the opposite will close the valve if it detects that pressure is too high.