Symptom Checks

Check the following items:

• Check the following Parameter Identification (PID) values: DPFEGR, ECT, IAC, LONGFT 1, LONGFT 2, VPWR and VREF. See appropriate article:

  For SOHC vehicles, see PIN VOLTAGE CHARTS .

  For DOHC vehicles, see PIN VOLTAGE CHARTS .

  On some vehicles, all PIDs may not be applicable.

• Check fuel delivery system. See CIRCUIT TEST HC in appropriate article:

  For SOHC vehicles, see TESTS W/CODES .

  For DOHC vehicles, see TESTS W/CODES .

• Check secondary ignition system. See CIRCUIT TEST JB in appropriate article:

  For SOHC vehicles, see TESTS W/CODES .

  For DOHC vehicles, see TESTS W/CODES .

• Check exhaust system. See CIRCUIT TEST HF in appropriate article:

  For SOHC vehicles, see TESTS W/CODES .

  For DOHC vehicles, see TESTS W/CODES .

• Check engine compression. Check engine mechanical condition. Check intake manifold gasket, camshaft and valves.
• On A/T vehicles, ensure transmission is functioning properly. If engine stalls during transmission engagement, check transmission solenoids. See TRANSMISSION SERVICE & REPAIR article.
• Check for binding/dragging brakes.
• On Escort ZX2, check if A/C turns off under Wide Open Throttle (WOT) conditions. See A/C DOES NOT TURN OFF DURING WOT symptom.
• On M/T vehicles, check clutch operation. On all vehicles, check charging system. Check customer driving habits (i.e., driving with excessive loads). If no problems are indicated, return to SYMPTOM DIAGNOSIS  to identify any additional symptoms or go to CIRCUIT TEST Z in appropriate article and check for intermittent faults:

  For SOHC vehicles, see TESTS W/CODES .

  For DOHC vehicles, see TESTS W/CODES .