EGR Vacuum Control Solenoids
Solenoids create magnetic fields when electrically activated. In this case the solenoid is designed to initiate a vacuum that then opens the EGR valve. The EGR valve is a component of the exhaust gas recirculation system. When the EGR valve opens it allows the exhaust to be let out to the exhaust system. When the valve is closed, it usually means that the engine is cold and is not burning fuel efficiently. The EGR system keeps the exhaust recalculating until the engine is warm and using fuel more efficiently. Repairs on the EGR are usually quite accessible and that makes the job a bit easier to do. The job is messy though, lots of gunk builds up in the EGR unit. When the EGR malfunctions, the solenoid is one possible reason for the problem. It can be replaced or sometimes cleaning is sufficient to remedy the problem.