Look at the plug wires to make sure they are not burnt or laying on the exhaust.ĭiagnostic trouble code P131C Ford Fiesta is not difficult to diagnose and repair. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Transmission Control Module Reprogrammable Memory Problem.A/C System High Pressure High Temperature Problem.Cruise Control Servo Indicates Low Problem.Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.A large air leak at or near the number one oxygen sensor would also cause a lean mixture.Faulty IMRC actuator relay (if equipped).
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