1.2 Knock Sensor System

TCI-h ignition with knock sensor differs from the basic TCI-h system with the addition of an engine knock sensor and knock sensor control unit (Fig. 1-2). With this system, the distributor has no vacuum or centrifugal advance mechanisms. All adjustments to ignition timing are done electronically. The knock sensor system detects pre-ignition or detonation (commonly called knock or ping), and adjusts ignition timing electronically to eliminate it. The system also makes the timing advance adjustments which are necessary at higher engine speeds.

Fig. 1-2.

Schematic view of Transistorized Coil Ignition (TCI-h) with knock sensor system.