Electronic Engine Control III: Description

Ford Electronic Engine Control III (EEC-III) with feedback carburetor is used on 351" models in all states and on 302" Ford and Mercury for California. All 302" Lincoln and Mark VI models use EEC-III with Electronic Fuel Injection (EFI). EEC-III replaces EEC-I and EEC-II systems used earlier.

The EEC system consists of an Electronic Control Assembly (ECA), several sensors located on the engine or in the various engine systems, special actuators governed by the ECA, and various connecting electrical and vacuum lines. This system adjusts the engine to the best settings for various conditions of load, speed, temperature and altitude by controlling the following functions:

• Ignition Timing
• Carburetor Air/Fuel Ratio
• Engine Speed At Idle
• Exhaust Gas Recirculation (EGR) Flow Rate
• Secondary (Thermactor) Air Flow Rate
• Fuel Evaporation Canister Purging
  NOTE: There are approximately 25, 000 351" engines in 1980 vehicles with the EEC-II system. These engines are easily identified by the SILVER engine decal and by a red vinyl tag on the harness near the EEC module connector in the engine compartment which is marked "EEC-II". EEC-III vehicles have a GOLD tone engine decal. The primary difference is in Test Sequence which is covered in the Tester Operator's Manual.