Chart 16-State Emission Test Failure

NOTE: Canada and some states or metropolitan areas in the United States require periodic idle emission tests. All Ford products have been designed to pass these tests. If a Ford product fails an idle Emission test, it is probable that 1), the engine temperature was not warm and stabilized prior to the test, or 2), the vehicle had idled excessively long prior to the test.

Before starting any services, verify complaints of idle emission test failure by using test procedure of area that failed vehicle.

The following encompasses most of the emissions measurement modes of current state idle test procedures:

Ensure engine is at normal operating temperature and all accessories are turned off.
Read emissions at idle.
Operate engine at 2200-2800 RPM.
Read emissions within 30 seconds.
Return engine speed to idle.
Read emissions within 30 seconds.

If any emission component is changed, Keep-Alive Memory (KAM) should be cleared before repeating state emission test procedure. See TESTS W/CODES article in the ENGINE PERFORMANCE Section.

DIAGNOSTIC CHART 16-STATE EMISSION TEST FAILURE

System & Component(s)	Reference
EEC EEC-IV Quick Test	See TESTS W/CODES article.
IGNITION Scope Engine For: Spark Plugs, Wires, Coil, Timing, etc.	See BASIC TESTING article.
VACUUM DISTRIBUTION Vacuum Leaks/Blockage	Perform a visual and audible inspection.
FUEL/THROTTLE BODY Idle Airflow Injectors Fuel Rail Fuel Pressure	Perform a visual inspection. See FUEL SYSTEMS in I - SYS/COMP TESTS article.
EGR Valve Vacuum Regulator	See I - SYS/COMP TESTS article.
PCV Valve	See I - SYS/COMP TESTS article.
EVAP Valve	See I - SYS/COMP TESTS article.
THERMACTOR Thermactor System Components	See I - SYS/COMP TESTS article.
EXHAUST Pipes, Muffler, Catalysts, Resonator, etc.	Inspect exhaust system.
COOLING Unstabilized Engine Temperature	Check cooling system.
BASE ENGINE Scheduled Maintenance Compression Valve Train Camshaft Intake Manifold Leaks	Check engine mechanical condition.