Electronic Module Retard (EMR)

This is a spark control system which uses an HEI module with a timing retard feature. When retard circuit is grounded, firing of spark plugs is delayed for a calibrated number of crankshaft degrees. The grounding circuit is controlled by ECM. When retard circuit is open, there is no delay and distributor fires spark plugs as controlled by engine speed and vacuum. The EMR system is only used on 3.8L (VIN Code K) engines.