Symptom Checks

Perform the following:

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

  For SOHC vehicles, see TESTS W/CODES .

  For DOHC vehicles, see TESTS W/CODES .

• Check cooling system for overheating (hard hot start symptom only).
• Check Positive Crankcase Ventilation (PCV) system. See CIRCUIT TEST HG in appropriate article:

  For SOHC vehicles, see TESTS W/CODES .

  For DOHC vehicles, see TESTS W/CODES .

• Check Fuel Evaporation (EVAP) system.
• Check intake air system. See CIRCUIT TEST HU in appropriate article:

  For SOHC vehicles, see TESTS W/CODES .

  For DOHC vehicles, see TESTS W/CODES .

• Check starting system.
• Check for contaminated Mass Airflow (MAF) sensor. If MAF sensor is okay, 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 .