Symptom Checks

Check the following items:

• Perform QUICK TEST. See the TESTS W/CODES - EEC-IV article. If code is present, use appropriate CIRCUIT TEST.
• Check ignition system. See IGNITION SYSTEMS in the SYSTEM/COMPONENT TESTS article.
• Check idle speed. See IDLE SPEED in the ADJUSTMENTS article.
• Check fuel pump. See FUEL SYSTEM in the SYSTEM/COMPONENT TESTS article.
• Check PCV system.
• Ensure engine operates at normal operating temperature.
• Check EGR system. See the SYSTEM/COMPONENT TESTS article.
• Check engine compression. Check engine mechanical condition. Check intake manifold, manifold gasket, camshaft and valves.
• Check secondary air injection. See the SYSTEM/COMPONENT TESTS article.
• Check air intake system. Also ensure throttle plate and linkages operate properly.
• Check Evaporative Emission (EVAP) system. See the SYSTEM/COMPONENT TESTS article.
• Check charging system.
• Check exhaust system.