Chart 7-High Idle (Engine "Diesels")

DIAGNOSTIC CHART 7-HIGH IDLE (ENGINE "DIESELS")

System & Component(s)	Reference
FUEL/THROTTLE BODY Idle Airflow Throttle Plate & Linkage Speed Control Chain	Perform a visual inspection. See FUEL SYSTEMS in I - SYS/COMP TESTS article.
VACUUM DISTRIBUTION Vacuum Leaks	Perform a visual and audible inspection.
EEC EEC-IV Quick Test	See TESTS W/CODES article.
AIR INTAKE SYSTEM Air Tube Intake Manifold Gasket	Perform a visual & audible inspection.
COOLING Overheating	Check cooling system.
AIR CONDITIONING A/C Clutch A/C Demand A/C Cyclic Pressure Switch A/C Refrigerant Charge	Check air conditioning system