Symptom Checks

Perform the following:

• Ensure engine operates at normal operating temperature.
• Check ignition system. See IGNITION SYSTEMS in appropriate SYSTEM/COMPONENT TESTS article in the ENGINE PERFORMANCE section.
• Check power to MAP/BARO sensor. See step 3) of CIRCUIT TEST S in TESTS W/CODES - EEC-IV article in the ENGINE PERFORMANCE section.
• Check idle speed. See IDLE SPEED in ADJUSTMENTS article in the ENGINE PERFORMANCE section.
• Check PCV system. See EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM/COMPONENT TESTS article in the ENGINE PERFORMANCE section.
• Check Fuel Evaporation (EVAP) system. See EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM/COMPONENT TESTS article in the ENGINE PERFORMANCE section.
• Check air injection (if equipped). See EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM/COMPONENT TESTS article in the ENGINE PERFORMANCE section.
• Check EGR system. See EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM/COMPONENT TESTS article in the ENGINE PERFORMANCE section.
• Check engine mechanical condition. Check compression, intake manifold gasket, camshaft and valve train components, etc.