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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 45 (Engine Controls - Theory & Operation - 3.3L Gasoline) >> Computerized Engine Controls >> Input Devices >> Optical Distributor

Optical Distributor

WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.

Optical distributor provides engine speed and crankshaft position signals. The pick-up unit operates by detecting light passing through a rotating ring. PCM uses this information to control fuel injection, ignition timing and idle speed. For more information, See IGNITION SYSTEM  .

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