VAZ-2109 for its time was a pretty good car. And today, many poor car owners appreciate it for its unpretentiousness, high maintainability and adaptability to domestic operating conditions. It is the maintainability and simplicity of the design that allow the owners of the "nine" to independently restore the missing spark.
Check the candles
If the Nine engine refuses to start, the reason for this may be the lack of fuel supply or the absence of a spark. To check the spark, unscrew one of the spark plugs with a spark plug wrench, put a wire over it and bring it to the engine or ground at a distance of 5-7 mm. At the same time, the assistant should make a short attempt to start the car. If a spark runs between the plug and the ground, look for the cause in the fuel supply.
If there is no spark, this can happen for the following reasons:
- malfunction of spark plugs;
- Hall sensor malfunction;
- breakdown of the ignition coil;
- problems with the ignition switch.
To check the spark plugs, turn them out and make sure that there is no carbon and soot on the insulator. If there is carbon build-up on the insulator, clean and wipe it with fine-grained emery paper, then be sure to ignite. Check the gaps between the spark plug electrodes. It should be between 0.7 and 0.9 mm. Adjust it if necessary by folding the side electrode. Try plugging in a spare, proven plug that you are confident in working. If there is a spark on a tested candle, change the candles. If the spare also does not work, check the ignition system.
Check the ignition
To check the Hall sensor, arm yourself with a voltmeter or a 12-14 V light bulb with wires. Rotating the distributor, connect the voltmeter contacts or the light bulb wires to the sensor contacts. With a working sensor, the voltmeter should show a jumping voltage, and the light will turn on and off.
You can check the ignition switch in a similar way. Connect the voltmeter contacts or the light bulb wire to the "B +" contact and to ground. Then turn on the ignition. If voltage appears (the light comes on), proceed to checking the ignition coil.
On the coil, the wires that feed it often oxidize. Clean them and check for spark again. To check the coil itself, connect a serviceable candle to its middle wire. If the spark does not appear, change the coil.
At the same time, open the cover of the distributor (ignition distributor) and inspect the wires and contacts. If they are scorched or damaged, replace the distributor or its cover. Inspect the distributor slider: it should not have visible damage, rest freely on the spring and reliably touch all contacts on the distributor cover. A defective slider can be replaced separately without changing the entire ignition distributor.
The last malfunction may be a breakdown of the high-voltage wire. The wire is checked by measuring the resistance at its contacts. If the resistance is infinitely high, the wire is faulty.
After the fault is found, replace the faulty parts with new ones.
