Md. Riday Khan

· 06 Dec 2021

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Why does my candle jar turn black?

One of the most effective methods for diagnosing a motor is determining the appearance of spark plugs. The color of the cone ceramic insulator serves as an accurate indicator of the performance of each cylinder. Spark plugs react quickly when an abnormality occurs in the fuel mixture by changing the color of the center electrode insulator. So, due to deterioration in engine performance, the color of the spark plug may change within a few seconds. To carry out this test, make a test drive on the car for 15 minutes. In this case, the manual air damper control mechanism is not used. After the trip, the candles are unscrewed and laid out according to the cylinders where they worked. Black carbon deposits on the spark plugs indicate deviations in the composition of the fuel-air mixture. enriched fuel mixture.

With these engine malfunctions, all candles have the same black appearance. When one of four candles turns black, a malfunction in the corresponding cylinder can be detected, as well as a malfunction of the plug itself, its high-voltage wire, or tip. For more accurate identification of the cause, swap the places of the black and any of the clean candles and again make a 15-minute control trip. If, as a result, the black candle has cleared, and the clean one has turned black, this means that there is a malfunction in the cylinder in which the candles turn black. If a black candle remains black, but a clean one is clean, this indicates a malfunction of the black candle. Instead of rearranging the candles in places, they completely change the set of candles to a known good one. If the results of the test trip on a new set of candles are similar, the fault should be looked for in the cylinder. If the second set remains completely clean after the trip, the black plug from the first set is faulty. In addition, the plug malfunction is felt by the jerks of the car when driving.


The features of the blackening of the insulator on the candles also mean a lot. In case of unilateral blackening, when one side of the insulator is black and the other is light, the cause of the phenomenon may be a leaky fit of one of the valves, valve burnout, jamming of the valve stem in the guide sleeve, incorrect installation of the timing belt, violation of the throughput of the exhaust system. The features of the blackening of the insulator on the candles also mean a lot. In case of unilateral blackening, when one side of the insulator is black and the other is light, the cause of the phenomenon may be a leaky fit of one of the valves, valve burnout, jamming of the valve stem in the guide sleeve, incorrect installation of the timing belt, violation of the throughput of the exhaust system.

The features of the blackening of the insulator on the candles also mean a lot. In case of unilateral blackening, when one side of the insulator is black and the other is light, the cause of the phenomenon may be a leaky fit of one of the valves, valve burnout, jamming of the valve stem in the guide sleeve, incorrect installation of the timing belt, violation of the throughput of the exhaust system. If the cone of the insulator turns black, and the top of the insulator and the metal electrodes remain clean, this means that the spark plug does not match the glowing number for this engine. It should be replaced with a hotter one for this number. Conversely, a dazzling white spark plug means it is too hot on the glowing number for this motor.

In order for the engine in the car to start, there are special elements in the ignition system - candles. With their help, the fuel-air mixture is ignited, thanks to which the pistons in the cylinder are set in motion. The main body is a white ceramic insulator, but sometimes, when the engine is not working properly, the ceramic coating can turn black, that is, deposits from fuel products can appear on it.

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