In order to establish whether there is a spark, you need to remove the high voltage wire from the middle of the ignition distributor cover, bring it to a distance of approximately 10 mm to "mass" (engine) and turn the crankshaft with the starter. If a spark jumps, unscrew the candle, insert it into the tip, bring it to "mass" and turn the crankshaft again with the starter. If there is no spark, find the problem using the table below.
Attention! When connecting high-voltage wires, it is necessary to remember the sequence of operation of the cylinders (1-43-2). Remove the distributor cap: there is a mark on its body. With the cover installed, above this label is a wire to the 1st cylinder. High voltage wires for cylinders 4, 3 and 2 are located clockwise. When measuring the voltage at terminal 15 of the ignition coil with a voltmeter, the following measures must be taken to prevent electrical breakdown:
Connect a voltmeter to terminal 15 of the ignition coil and to "mass".
Connect the auxiliary wire to terminal 1 of the ignition coil and to "mass".
Turn on the starter and measure the voltage at the time of starting.
The voltage must be at least 9 V. An ohmmeter is required to check the runner of the RFI-protected distributor.
Connect an ohmmeter as shown in the figure and measure the resistance. It should be a maximum of 10 kΩ. In the same way, the resistance of high-voltage wires, including the tip of the spark plug, is checked. The resistance of each high-voltage wire, including the tip, must be no more than 10 kOhm.
Fault: engine starts poorly or does not start at all
Cause | Remedy |
Wrong start up | At temperatures below 0°C: Slowly depress the accelerator pedal once and release it. Turn on the ignition and immediately turn on the starter without pressing the accelerator pedal |
At temperatures above 0°C: during starting, slowly depress the accelerator pedal | |
With a hot engine: fully depress the accelerator pedal and start. After starting, immediately release the pedal | |
No spark. Wet or dirty distributor cap | Clean and dry the lid, treat it with a special aerosol |
Cracks, traces of burning in the cover of the ignition distributor | Replace cap |
Worn carbon contact in the ignition distributor cap | Replace contact |
Too large or too small gap in the contacts of the breaker | Correct clearance |
Breaker contacts burnt | Replace contacts |
Faulty ignition distributor | Replace Slider |
The resistance of the ignition distributor slider is too high | Replace Slider |
The resistance of the high-voltage wire or spark plug tip is too high | Replace wire or tip |
Tips installed in the wrong order | Install tips correctly |
Spark plugs flooded with gasoline due to too many start attempts | Dry the candles |
Spark plugs are damp or dirty on the outside | Clean, dry the candles, put protective covers on them and their tips |
Ignition coil power too low | Check the coil wires for tightness and reliability of contact |
Too few (less than 9 V) voltage at terminal 15 of the ignition coil | Charge battery, restore contact between battery and body or transmission and body, repair voltage drop between battery, light switch and terminal 15 |
The ignition coil has cracks, traces of burning | Replace coil |
Voltage drop due to contact of electrical connections and wires with the motor | Lay electrical wires correctly |
The capacitor in the ignition distributor has a bad connection or is defective | Fix the capacitor or replace it |
Ignition advance shifted | Adjust ignition timing |
Starter turns too slowly | Charge the battery, fill in all-weather oil in the cold season, check the starter |
Valve clearance incorrectly adjusted | Correct clearance |
Insufficient compression in the engine cylinders | Adjust valve clearances, repair engine |
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