The video we expose the internal of the Chevrolet LT1 front engine mount electronic distributor (hi-voltage).Part of a Complete Tune-up processor. HERE we explain the inner workings of Hi-Voltage Distribution Part.
This component can be found on the corvette,caprice,GMC trucks,Roadmaster,Cadillac.
Subject: theory and testing of Opti-spark(optical) systems
Contributing Source: General Motor service manuals and training materials
The General Motor Opti-spark ignition system is used on 1994-96 4.3-liter L99 (VIN W) V-8 engine and on 1992-97 5.7-liter LT1 (VIN P) V-8 engines. The Opti-spark distributor is mounted on the front of the engine block, above the crankshaft. The distributor is driven by the camshaft.
Opti-spark system rely on two optical cam position (CMP) sensors mounted inside the distributor. Beginning in 1996, Opti-spark equipped vehicles also included a crankshaft position (CKP) sensor mounted at the bottom of the timing cover, The PCM uses this CKP sensor only for misfire diagnosis, not ignition timing. This sensor is not part of the Opti-spark system.
The Opti-spark CMP sensor provide signal to the PCM (Powertrain Control Module) for ignition timing control. These sensors detect slots in the crank-driven signal disk. One CMP sensor detects 360 equally spaced slots per camshaft revolution, for high-resolution timing control. The other CMP sensor detect eight signal disc slots, the CMP reference signal toggle between 0.0 and 5.0 volts. The PCM compares the two CMP signal to determine if one of the inputs is not being received.