How to test egr valve

The function of the EGR valve is to: Provide extra oxygen to the engine. Reduce emissions of toxic oxides of nitrogen gases. Prevent air from interfering with cylinder combustion. I ask what car are you working on?

This dilutes the atmospheric air in the incoming air stream and provides gases inert to. Remove the EGR valve , and check for plugged passages under the valve. Linear EGR Valve Diagnosis. The linear EGR valve diagnosis procedure varies depending on the vehicle make and model year. The solenoid controls a rapid-deployment valve to regulate the flow of vacuum, through the ports, to the EGR valve.

Blow forcefully through one of the hoses. Air should not pass through. Turn the vehicle off and remove the key from the ignition. Allow the EGR valve ample time to cool down.

Open the hood and locate the EGR valve. The valve is mounted on the exhaust manifold. Refer to your vehicle repair manual for exact location and a diagram. Loosen the bolts to remove the EGR valve and gasket.

Spray the valve and hoses with carburetor cleaner, using a brush to clean off the carbon buildup out of any hoses and small hole with the pintle. If the valve is working you should notice a thump type noise as it closes. Do this a couple of times to verify the valve is operating properly. If it seems to be, you could then remove and bench test it.

Also check for a possible damaged exhaust manifol manifold to cylinder head leak, or exhaust flex joint problem (spring, seal).

Method Testing with a Multimeter 1. Use a multimeter to test the EGR valve. A multimeter tests the electrical wiring in your vehicle. Set the multimeter to read Volts.

A large V denotes the voltage setting. Consult your owner’s manual to find the exact location. Symptoms of a Bad EGR Valve Symptoms of a Bad EGR Valve. Actually there are two kinds of bad EGR valves,. The outside air picked up through.

The ECM controls the earth path to the solenoid valve. The information that the ECM requires for this operation is: engine temperature, vehicle speed and engine load. The Exhaust Gas Recirculation ( EGR ) valve is an important part of the exhaust circulation system of a vehicle.

Also these electronic EGR valves will stick in both the open and closed positions. How to troubleshoot Ford EGR. If the DPFE voltage changes, either the EGR pintle isn’t seating properly and it’s allowing exhaust flow past the seat, or the DPFE is bad.

They will be coated with black soot. When vacuum is applied to the EGR valve , it opens. This allows intake vacuum to suck exhaust into the engine.

To prevent the EGR valve from opening when the engine is col the vacuum line to the EGR valve may be connected to a parted vacuum switch or a computer-controlled solenoid. TEST 1: Continuous Vacuum to EGR Valve. The other side of the EGR vacuum solenoid has ports. One is a vent port (that vents vacuum to the atmosphere) when the engine is idling. To test the valve , you would hook up a hand vacuum pump, start the engine, apply vaccum, and if the engine stumbles, and almost dies, then the valve is working.

If there is a problem with the solenoi it would trigger a code in the pcm, and in effect illuminating your check engine light. The purpose of an EGR is to reduce the Nitrogen Oxide by passing some of the exhaust gasses back into the engine from the exhaust manifold. DTC will detect a faulty solenoi vacuum supply, EGR valve or plugged passage. This chart checks for plugged EGR passages, a sticking EGR valve , or a stuck open or inoperative solenoid.

Number(s) below refer to circled number(s) on the diagnostic chart. Understanding and Testing the EGR Valve. Checks for solenoid stuck open.

This is a question we get asked almost on a weekly basis. The EGR valve serves a specific function. If not working properly, it can increase exhaust emissions, lower fuel economy, cause rough idle, and carbon up the intake manifold on your engine. Using the vacuum pump can verify if the valve is closed when cold and heating the unit with a heat gun should result in the valve opening above approximately degrees Celsius. The combination EGR valve and feedback system in this unit is controlled and monitored by the ECM and requires no external vacuum source to operate.

If not, apply solvent to a cotton swab and clean the shaft and port. If it is, gently chip out the carbon with a small screwdriver and vacuum it out with a shop vacuum. EGR solenoids, without using a DVOM or T pins , until you find a problem.

Then reinstall the EGR valve using the new gasket. Clean filter with compressed air if necessary. Disconnect vacuum hose from EGR valve. Using a T connector, connect a vacuum gauge in EGR valve line.

To check and insure your EGR valve is working properly remove the vacuum line from the EGR , put a peice of hose on the EGR valve end and start the engine. If the engine dies, or you notice a dramatic drop in engine RPM,. Another way to test the EGR valve on some engines is to apply vacuum directly to the EGR valve.

Another symptom of a potential problem with the EGR vacuum modulator is a failed emissions test. This will result in increased NOx emissions, which can cause the vehicle to fail an emissions test if the levels climb too high.