Where is the EGR pipe located?
Where is the EGR pipe located?
Answer: The purpose of the EGR valve is to recirculating engine exhaust gas to the back to the engine cylinders. To accomplish this task the EGR valve is attached to the intake manifold of the engine. This location is atop of the engine near the carburetor, usually towards the back of the engine near the firewall.
How does the EGR valve work in an intake manifold?
Depending on how it has been controlled, the EGR valve releases the valve opening and allows exhaust emissions to flow into the intake manifold. The EGR valve is available in different versions: Single or twin-diaphragm versions, with and without position feedback or temperature sensor, and – of course – electrically controlled.
How can I check the vacuum supply to the EGR valve?
To check the vacuum supply to the valve, the manual vacuum pump can be used as a manometer. It is to be connected to the supply line of the EGR valve. With the engine running, the prevailing vacuum is displayed.
How does the recirculation valve affect the EGR rate?
If the combustion temperature is high, nitrogen oxides are produced in the engine’s combustion chamber. The combustion temperature in the combustion chamber is reduced by recirculating a portion of the exhaust emissions back to the fresh intake air. The lower combustion temperature results in less nitrogen oxide. EGR rate (max.)
What is the purpose of a pressure transducer in an EGR valve?
The purpose of pressure transducers is to control the vacuum required for the EGR valve. They adjust the vacuum to suit the respective engine load state so as to maintain a precisely defined recirculation rate. They are controlled either mechanically or electrically.
How to test an EGR valve, a simple procedure?
Connect a hand vacuum pump to the EGR valve in place of the vacuum hose and apply 15 in-Hg of vacuum to the valve (if you don’t have access to a vacuum pump you may borrow-rent one from a local auto parts store). As you apply vacuum to the valve, check for diaphragm movement.
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.
Why do I not feel pressure on my EGR valve?
You should feel vacuum or a slight pressure on your finger tip, depending on the particular system type. If you don’t feel a change in vacuum or pressure, likely the problem lies with the circuit that provides vacuum or pressure to the valve. Reconnect the vacuum hose to the valve.
Can a bad EGR sensor fail an emissions test?
If the EGR pressure sensor has any issues which affect the functionality of the EGR system it can cause the vehicle to fail an emissions test. This is particularly important in states that require the vehicle to pass an emissions test in order to register the vehicle. 3. Check Engine Light comes on
