Symptom Checks

Check the following items:

• Perform QUICK TEST. See G - EEC-IV TESTS W/CODES article in the ENGINE PERFORMANCE Section. If code is present, perform appropriate CIRCUIT TEST.
• Check cooling system for overheating. If cooling system is overheating, go to ENGINE RUNS HOT symptom.
• Check base timing. See ADJUSTMENTS article in the ENGINE PERFORMANCE Section.
• Perform QUICK TEST. See G - EEC-IV TESTS W/CODES article in the ENGINE PERFORMANCE Section. If code is present, perform appropriate CIRCUIT TEST.
• Check engine compression. Check engine mechanical condition. Check intake manifold, manifold gasket, camshaft and valves.
• Check fuel delivery system. See FUEL SYSTEM in I - EEC-IV SYS/COMP TESTS article in the ENGINE PERFORMANCE Section.
• Check EGR system. See I - EEC-IV SYS/COMP TESTS article in the ENGINE PERFORMANCE Section.
• Check PCV system.
• Check secondary air injection. See I - EEC-IV SYS/COMP TESTS article in the ENGINE PERFORMANCE Section.
• Ensure transmission is functioning properly.
• Check oil quality.