DELCO-REMY Electronic Module Retard Ignition System: Description
The Electronic Module Retard (EMR) ignition system is used on Camaro, Impala, Caprice and Malibu models using the 229" V6 engine.
Electronic Module Retard (EMR) system retards timing a fixed amount when engine coolant temperature is below 120°F.
The EMR distributor is easily identified, as it has a vacuum advance unit (none used on EST distributors). It also uses a 5-terminal HEI-EMR module (instead of the 7-terminal HEI-EST module) inside the distributor. See Fig 1. Other components include an EMR vacuum switch, mounted near the front of the engine, and a "TACH" signal conditioner mounted at the front of the right fender, near the coolant recovery tank.