A common part
Electronic ignition system components are usually very reliable in operation; most of the faults occur as a result of a broken wiring or dirty contacts.
We do not recommend using the spark test method by bringing the HV wire under current close to the engine - not only because of the risk of electric shock, but because of the possibility of damage to the ignition coil or electronic module.
Engine won't start
If the engine crankshaft does not rotate or rotates very slowly, check the battery or starter. Connect a voltmeter in parallel to the battery terminals (observe the polarity of the connection). disconnect the HV ignition coil from the distributor cap and ground it to ground, then check the voltage while starting the engine with the starter for about 10 seconds (no more). If reading is less than about 8 volts, check battery, starter and charger (chapter 12).
If the crankshaft rotates at normal speed. but does not start, check the HV circuit by connecting the ignition timing indicator (following the manufacturer's instructions) and cranking the engine with a starter; if the indicator flashes, voltage is being supplied to the spark plugs, so they should be checked first. If the indicator does not flash, check the HV wires. then the distributor cap, brushes and rotating lever (see next section). Also, use an ohmmeter or tester to check for an open circuit between the distributor cap contacts. Also check that there is no continuity between the rotor cam body and its metal contact - remember that there is a resistor built into the lever.
If there is a spark, check the fuel supply system (chapter 4).
If there is no spark, check the voltage at the positive terminal of the ignition coil (black wires), which should be the same. as well as on the battery terminals (approx. 11.5 V). If the coil voltage is significant (more than 1.0 V) less than the battery terminals, check the feedback through the fuse box and ignition switch to the battery and battery ground until you find the fault.
If communication with the coil is not broken, check the coil winding as indicated below in the section "Ignition coil". If the coil is damaged, replace it, but check the condition of the low voltage circuit connections carefully.
If the coil is not damaged, the fault is likely in the electronic module or ignition distributor. To check the module and distributor, connect the appropriate measuring device to the LV terminals in accordance with the instructions of the device manufacturers. If the ignition is turned on and the engine is cranked by the starter, the voltmeter reading should fluctuate in magnitude every time the module sends a HV pulse to the ignition coil. If the readings fluctuate while cranking the engine, the electronic module and distributor are not damaged.
If the electronic module and distributor are in good condition and the entire LV circuit is also intact, therefore, a malfunction in the ignition system must be sought in the HV circuit.
Interruptions in the working ignition system
Intermittent misfiring suggests a loose connection or intermittent failure in the primary circuit, or damage to the ignition coil side of the rotating cam HV circuit.
After turning off the ignition, carefully check the entire system, making sure that. that all connections are clean and secure. If monitoring equipment is present, check the LV circuit as previously indicated.
Make sure the distributor cap and HV wires are clean and dry. Also check wires and spark plugs (by replacement if needed), and then the distributor cap, carbon brushes and rotating cam.
Regular interruptions in ignition occur, as a rule, as a result of a malfunction of the distributor, or damage to the HV wires or candles. Using the ignition indicator, check for the presence of HV in all wires.
If there is no HV on any of the wires. Means. damage in this wire or distributor cap. If there is HV on all wires, damage must be sought in the spark plugs. Check and replace them if you are in doubt about their condition.
If there is no HV, check the coil, as the secondary winding may fail under load.
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