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 below. If code is present, perform appropriate CIRCUIT TEST.
- TESTS W/CODES - EEC-IV (3.0L)
- TESTS W/CODES - EEC-IV (4.0L)
- Check fuel delivery system. See FUEL SYSTEM in appropriate appropriate SYSTEM/COMPONENT TESTS article below.
- Check ignition system. See IGNITION SYSTEMS in appropriate SYSTEM/COMPONENT TESTS article below.
- Check for restricted exhaust system.
- Ensure engine is operating at normal operating temperature.
- Check EGR system. See EMISSION SYSTEMS & SUB-SYSTEMS in appropriate SYSTEM/COMPONENT TESTS article below.
- Ensure transmission is functioning properly.
- Check air injection (if equipped). See EMISSION SYSTEMS & SUB-SYSTEMS in appropriate SYSTEM/COMPONENT TESTS article below.
- Check PCV system. See EMISSION SYSTEMS & SUB-SYSTEMS in appropriate SYSTEM/COMPONENT TESTS article below.
- SYSTEM/COMPONENT TESTS - EEC-IV (3.0L)
- SYSTEM/COMPONENT TESTS - EEC-IV (4.0L)
- Check for binding/dragging brakes.
- Check engine mechanical condition. Check compression, camshaft, valve train components, etc.
- Check for contaminated Mass Airflow (MAF) sensor.