Rough Idle

SYMPTOM
Rough Idle

Check:
1. Idle Control System
a. Hoses and Connections
b. Electronic Air Control Valve (EACV) (14)
2. Fuel Supply
a. Fuel Injector (16)
b. Pressure Regulator
3. Emission Control System
a. Exhaust Gas Recirculation (EGR) System (12)
b. Positive Crankcase Ventilation (PCV) System
4. Manifold Absolute Pressure (MAP) Sensor (3)(5)
5. PGM-FI Control (ECU) Unit (BU)

NOTE:
After each symptom, the system that could be the source of the symptom are listed and should be checked in the order they are listed, beginning with #1.

(BU) code used when the CHECK ENGINE warning light is on, and the self-diagnosis indicator LED is ON with no "blinks", the back-up system is in operation.

Self-diagnosis indicator, (LED) blinks (?), will follow associated systems.