Ford P1078 OBD-II Trouble Code Definition: P1078 Intake Manifold Runner Control Valve Long Stuck P1078 Ford OBD-II Trouble CodeDescription: Causes – Faulty Intake Manifold Runner Control (IMRC) Valve– IMRC Valve harness is open or shorted– IMRC Valve circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) […]