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 Intercooler Tube (Thunderbird SC only)	Check connections.
CHARGING SYSTEM Components	Check charging system.
EXHAUST SYSTEM Components	Inspect exhaust system.
THERMACTOR Thermactor System Components	See I - SYS/COMP TESTS article.