Symptom Checks

Check the following items:

• Check cooling system for overheating. If cooling system is overheating, go to ENGINE RUNS HOT symptom.
• Perform QUICK TEST. See the TESTS W/CODES - EEC-IV article. If code is present, use 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 the SYSTEM/COMPONENT TESTS article.
• Check EGR system. See the SYSTEM/COMPONENT TESTS article.
• Check PCV system.
• Check secondary air injection. See the SYSTEM/COMPONENT TESTS article.
• Ensure transmission is functioning properly.
• If vehicle is equipped with an octane adjust shorting bar, go to step 5) of CIRCUIT TEST KP in the TESTS W/CODES - EEC-IV article.
• Check oil quality.
• Check for exhaust leaks.