Chart 6-Rough Idle

DIAGNOSTIC CHART 6-ROUGH IDLE

System & Component(s)	Reference
IGNITION Scope Engine For: Spark Plug Coil, Secondary Ignition Wires, Distributor Cap, Adapter and Rotor, Ignition Timing	See BASIC TESTING article.
EEC EEC-IV Quick Test	See TESTS W/CODES article.
FUEL/THROTTLE BODY Idle Airflow Electrical & Vacuum Com- ponents Fuel Pressure Regulator Injectors Fuel Rail Fuel Lines	Perform a visual inspection. See FUEL SYSTEMS in I - SYS/COMP TESTS article.
VACUUM DISTRIBUTION Vacuum Leaks	Perform a visual and audible inspection.
COOLING Thermostatic Fan (Loose or Cracked)	Check Cooling System.
EGR Valve	See I - SYS/COMP TESTS article.
BASE ENGINE Compression Valve Train Camshaft Intake Manifold Gaskets	Check Engine Mechanical Condition.
PCV Valve	See I - SYS/COMP TESTS article.
EVAP Components	See I - SYS/COMP TESTS article.
AIR INTAKE SYSTEM Air Tube	Check connections.
CHARGING SYSTEM Components	Check charging system.
EXHAUST SYSTEM Components	Inspect exhaust system.
THERMACTOR Thermactor System Components	See I - SYS/COMP TESTS article.