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General information and safety measures
The ignition system is to ignite the air-fuel mixture in each cylinder at precisely specified point of time. In gasoline engines, this is achieved by an electric spark (electric discharge) generated between the electrodes of a spark plug. Reliable operation of the ignition in the entire range of the engine is essential effectiveness of the catalytic converter. Ignition spark small cloud of fine fuel mixture just sufficient to initiate the ignition process. Key elements include the ignition system battery, distributor, coil and ignition switch, spark plugs, wires, low and high voltage. This ignition system is used contactless magnetic system, elements of which are located inside the ignition distributor includes a distributor rotor, a sensor winding, a mechanical centrifugal regulator ignition timing, the ignition timing control vacuum switch. The latter is an electronic assembly, so care of the contact group as a mechanical chopper is not required. In the electronic ignition system ignition voltage is greater than 30 kW. Under adverse circumstances (humidity in the engine compartment) voltage peaks can penetrate the insulation and cause a shock when touched. To avoid injury and damage to the ignition system when working with it should meet the following requirements: - Do not touch the hand and does not turn off the ignition wire when the engine is running or cranking the starter motor; - Disable the ignition system wires, to connect and disconnect any measuring devices only with the ignition off; - The ignition coil can not be installed, designed for systems with breaker; - If heated above 80 ?� C (if the color of the car), you can not start the engine immediately after heating; - To carry out cleaning of the engine only when the engine is not running; - When carrying out welding operations necessary to disconnect the battery; - It is forbidden to carry out work with the ignition system for people with pacemaker.
Ignition System Check
| Fig. 7.1. Use pliers to hold the high voltage wires while checking sparking
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If the starter turns but the engine does not start, disconnect the wire from the spark plugs, bring it to the bare spots "weight" of the car at a distance of about 6 mm, and ask the assistant to the starter. During testing sparking hold high voltage wire tongs (Fig. 7.1). If sparking is not observed, check in exactly the same way there is a spark in the next cylinder. Sparks and its subsequent disappearance is a criterion for the absence of sparking. If there is a stable spark, check the spark and / or fuel supply. If the spark is weak or absent, disconnect the ignition coil from the ignition distributor, hold it for about 6 mm from the bared site of "weight" of the car and check the spark just as described. If there is no spark, check the ignition coil. If there is a spark, check the ignition distributor cap and / or the rotor of the distributor. Further inspection of the ignition system should be carried out at the service center or workshop.
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