- candle key
- round probe
Replacement interval: After 30,000 km of run.
When checking and replacing spark plugs, be careful - if the engine is hot, you can get burned.
Disconnect the wire from the terminal "—" battery.
Candle type: A17DVR, A17DVRM, FE65PR, FE65CPR. Until 1988, candles of types A17DV, FE65P were installed on the VAZ-2109.
When preparing for winter operation, replace the spark plugs with new ones.
We recommend replacing the spark plugs every 30,000 km, even if they are still in working condition: old spark plugs can increase fuel consumption.
Regularly check the reliability of the connections of high-voltage wires with candles, coil and ignition distributor.
Dirty insulation of high-voltage wires can lead to current leakage, so wipe them with a rag as they get dirty.
Attention! Do not overtighten the spark plugs - the ceramic insulator of the spark plug may crack, resulting in poor engine performance.
1. When removing the tip from the spark plug, do not pull on the wire. If you need to remove all the tips, pre-mark the high-voltage wires.
2. Clean the candle niches from dirt.
3. Carefully unscrew the candle with a special key. If the spark plug is hard to remove due to carbon deposits, drop some WD-40 or "Unisma", not to damage the thread.
4. Examine the candle. If the insulator has cracks, threads or electrodes are damaged, the spark plug must be replaced.
5. Light brown soot, evenly covering the bottom of the candle with a thin layer, does not affect the operation of the ignition system and can not be cleaned.
6. The absence of carbon deposits on the candle indicates either the operation of the engine on a lean mixture, or an incorrectly set ignition timing, or a discrepancy between the brand of the candle and the type of engine.
7. Shiny black soot, indicating that oil has entered the engine cylinder, must be cleaned.
8. Check the gap between the spark plug electrodes (only round probe). The gap should be 0.7-0.8 mm. Check the gap only with a round feeler gauge.
9. If the gap differs from the specified, adjust it by bending the side electrode.