Ignition System - HEI-Est (CALIF): Description

The Delco-Remy HEI-EST system is controlled by the Computer Command Control (CCC) system. It is designed to provide optimum performance through electronic control of spark timing, air/fuel ratios and idle speed.

The system consists of an Electronic Control Module (ECM), HEI-EST distributor, external ignition coil, and wiring harness. The distributor does not use vacuum or centrifugal advance. See Fig 1 and Fig 2 .

The distributor contains a 7-terminal HEI-EST electronic module, timer core, pole piece, pick-up coil, and a radio noise suppression capacitor.

Fig 1: HEI-EST Distributor With Sealed Connector Ignition coil is external (not shown).

The distributor is integrated to the EST system by a 4-wire connector, leading to the Electronic Control Module (ECM). The ECM receives voltage signals from various sensors. A typical system is provided signals from oxygen, engine coolant temperature, throttle position, barometric pressure and manifold absolute pressure sensors.

Fig 2: HEI-EST Distributor Without Sealed Connector Timer core and pole piece have one tooth per cylinder.