What Is An EGR Valve? EGR valves are a common point of failure on most modern diesel engines. When the valve sticks, it triggers the check engine light and decreases power. Simply replacing the valve isn’t enough to protect your engine, since failure is usually caused by problems with ot...
Gasoline EGR valvesare very similar to high-pressure ones. The vacuum created by cylinder depression draws the exhaust gases in, and the flow is regulated by the opening and closing of the EGR valve. Vacuum-operated EGRvalves use a vacuum solenoid to vary the vacuum and direct it, opening ...
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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. Step 3 Turn the multimeter on and set the dial to "Volts DC." Attach the red lead wire to the EGR circuit labeled "C." There ...
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At idling, theEGR valveis in the closed position because of the spring pressure and lower ported vacuum. The engineers designed it so because if the exhaust gases recirculate at the idling, then it would cause rough/erratic idling. Upon opening of the throttle applies the ported vacuum and gr...
For example, multiple sensors or actuators can cause an engine surge when there is a fault in the following components: TheEGR valve An oxygen sensor Throttle position sensor (TPS) Manifold overpressure sensor (MAP) Vehicle speed sensor (VSS) ...
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P0401:This code signifies a reduced flow of recirculated exhaust gases into the intake manifold resulting from a faulty EGR valve. P0402:The EGR Flow Excessive Detected code means there is too much recirculated exhaust gas flowing through the system. ...
Check ignition timing -- if possible (should be checked even if it is not adjustable to detect possible computer or sensor problems) Operation of theEGR valve. OTHER TUNE-UP CHECKS In addition to these performance checks, hoses and belts should be visually inspected. ...