Distributor Caps & Rotors, Replacement Dist. Rotors
The distributor controls the sparks that fire the pistons that run the engine. The control module on or in the distributor controls the current for the ignition coil. Depending upon what signals come from the distributor, the control module switches transistors on and off. This puts out an electrical signal that directly relates to the speed of the engine and the crankshaft position. In vehicles that do not have distributors, several other sensors replace the distributor control module. Distributor control modules base their timing on the input of the ignition control sensors. The module is meant to time the spark plugs just for starting the engine. Further timing is controlled by several sensors the input to computed timing control units. Both are important to optimal function of a vehicle. The distributor control module can be a bit difficult to identify because it is surrounded by insulation to protect the heat sensitive components of the unit.