Symptom Checks
WARNING: This page is about a different car, the 1995 Ford Aerostar. However, it is still accessible from the selected car via links, so may be relevant.
Perform the following:
- Perform QUICK TEST. See appropriate TESTS W/CODES - EEC -IV article appropriate. If code is present, perform appropriate CIRCUIT TEST.
- Ensure engine is operating at normal operating temperature.
- Check power to MAP/BARO sensor. See step 3) of CIRCUIT TEST S in appropriate TESTS W/CODES - EEC-IV article below.
- TESTS W/CODES - EEC-IV (3.0L)
- TESTS W/CODES - EEC-IV (4.0L)
- Check ignition system. See IGNITION SYSTEMS in appropriate appropriate SYSTEM/COMPONENT TESTS article below.
- SYSTEM/COMPONENT TESTS - EEC-IV (3.0L)
- SYSTEM/COMPONENT TESTS - EEC-IV (4.0L)
- Check idle speed. See IDLE SPEED & MIXTURE in appropriate ADJUSTMENTS article below.
- ADJUSTMENTS - 3.0L
- ADJUSTMENTS - 4.0L
- Check Fuel Evaporation (EVAP) system. See EMISSION SYSTEMS & SUB-SYSTEMS in appropriate SYSTEM/COMPONENT TESTS article.
- SYSTEM/COMPONENT TESTS - EEC-IV (3.0L)
- SYSTEM/COMPONENT TESTS - EEC-IV (4.0L)
- If surge occurs with A/C on, check A/C clutch operation. See A/C-HEATER SYSTEM - MANUAL article in the AIR CONDITIONING & HEAT section.
- Check Fuel Evaporation (EVAP) system. See EMISSION SYSTEMS & SUB-SYSTEMS in appropriate SYSTEM/COMPONENT TESTS article below.
- Check EGR system. See EMISSION SYSTEMS & SUB-SYSTEMS in appropriate SYSTEM/COMPONENT TESTS article below.
- Check air injection (if equipped). See EMISSION SYSTEMS & SUB-SYSTEMS in appropriate SYSTEM/COMPONENT TESTS article below.
- Check air intake system. Ensure throttle plate and linkages operate properly.
- Check fuel delivery system. See FUEL SYSTEM in appropriate SYSTEM/COMPONENT TESTS article below.
- SYSTEM/COMPONENT TESTS - EEC-IV (3.0L)
- SYSTEM/COMPONENT TESTS - EEC-IV (4.0L)
- Check engine mechanical condition. Check compression, camshaft, valve train components, etc.
- Check Heated Oxygen Sensor (HO2S). Go to step 21) of CIRCUIT TEST H in appropriate TESTS W/CODES - EEC-IV article below.
- TESTS W/CODES - EEC-IV (3.0L)
- TESTS W/CODES - EEC-IV (4.0L)
- Ensure speed (cruise) control system is functioning properly.