EGR Solenoid Mechanical Function Check

Disconnect vacuum hose from EGR valve and connect vacuum gauge to hose. Take the engine to 2000-2500 RPM 8 to 10 times and check for vacuum rise above 15 in. Hg and return to zero when throttle is released (hot engine). If vacuum gauge does not return to zero or is inconsistent, solenoids are damaged or worn and must be replaced. If vacuum rises above zero during cold engine operation, solenoids are leaking and must be replaced.