Ported EGR Valve
Warm engine to operating temperature. Disconnect Red-stripped hose from modulator valve. Apply vacuum to hose. If engine RPM drops, EGR valve is okay. If engine RPM does not drop, check hoses, connections, and vacuum tank.
Warm engine to operating temperature. Disconnect Red-stripped hose from modulator valve. Apply vacuum to hose. If engine RPM drops, EGR valve is okay. If engine RPM does not drop, check hoses, connections, and vacuum tank.