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  • Date: August 21, 2007

Diagnostics of engine operation as candles

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Diagnostics of engine operation as candles

Spark plugs, these simple-looking compounds of metal and ceramics are an essential element in engine performance. Even in appearance, candles can say a lot about the work of the engine as a whole, and about its individual nodes.
Inspection of the candle should be carried out after a long engine run, the ideal option would be to inspect the candle after a long trip on a country highway. The error of some motorists, for example, is that after a cold start of the engine at minus temperature and its unstable work, first of all, they unscrew the candles and, after seeing the black carbon, make hasty conclusions. But this carbon could have been formed while the engine was operating in the cold start mode, when the mixture was forcibly enriched, and unstable work could be a result of, say, the bad state of high-voltage wires.Therefore, I want to emphasize once again if something does not suit you in the operation of the engine, and you decide to make diagnostics of its work with the help of candles, you need to drive at least initially clean candles at least 250-300 kilometers and even more, and only after that do you draw any conclusions .
Diagnostics of engine operation as candles

The photo? 1 shows a candle, turned out of the engine, the work of which can be considered excellent. The skirt of the central electrode has a light brown color, soot and deposits are minimal. Complete absence of traces of oil. The owner of this engine can only envy, and there is something that is economical fuel consumption and no need to add oil from replacement to replacement.
Diagnostics of engine operation as candles

The photo? 2 is a typical example of a spark plug from an engine with increased fuel consumption. The central electrode is covered with velvety black soot. There are several reasons for this: rich air-fuel mixture (incorrect adjustment of the carburetor or injector failure), clogged air filter.
Diagnostics of engine operation as candles

In the third photo, on the contrary, an example of an overly poor air-fuel mixture. Electrode color from light gray to white. There is cause for concern. Driving too lean and at elevated loads can cause significant overheating of both the spark plug and the combustion chamber,and overheating of the combustion chamber is a direct path to burnout of exhaust valves.
Diagnostics of engine operation as candles

The skirt of the central electrode of the candle shown in the photo? 4 has a characteristic reddish tint, this color can be compared to the color of red brick. This redness is caused by the engine operating on fuel containing an excessive amount of metal-containing additives. Prolonged use of such fuel will lead to the fact that metal deposits form a conductive deposit on the insulation surface, through which the current will be easier to pass than between the electrodes of the candle, and the candle will stop working.
Diagnostics of engine operation as candles

A photo ? 5. The candle has pronounced traces of oil, especially in the threaded part. The engine with such candles after a long parking lot, usually after starting “troit” for some time, and as it warms up, the work stabilizes. The reason for this is the unsatisfactory state of the oil caps. There is an increased oil consumption. In the first minutes of the engine, at the time of warming up, the characteristic white-blue exhaust.
Diagnostics of engine operation as candles

Candle in the photo? 6 is turned out of the idle cylinder. The central electrode, its skirt are covered with a dense layer of oil mixed with unburned fuel droplets and small particles from the damage that occurred in this cylinder.The reason for this - the destruction of one of the valves or breakage of the walls between the piston rings with metal particles between the valve and its seat. In this case, the engine "troit" is not ceasing, a significant loss of power is noticeable, fuel consumption increases by one and a half, two times. Only one way out - repair.
Diagnostics of engine operation as candles

A photo ? 7 is the complete destruction of the central electrode with its ceramic skirt. The reason for this destruction could be one of the following factors: long-term engine operation with detonation, the use of low-octane fuel, very early ignition, and just a defective candle. Symptoms of the engine are the same as in the previous case. The only thing that can be hoped for is that the particles of the central electrode managed to slip into the exhaust system without getting stuck under the exhaust valve, otherwise it would be possible to avoid repairing the cylinder head. But it depends on the person, he is a sinner or not (joke). If we talk about this particular candle, God pardoned its owner.
Diagnostics of engine operation as candles

A photo ? 8 last in this review. The electrode of the candle was overgrown with ash deposits, the color does not play a decisive role, it only indicates the operation of the fuel system.The reason for this build-up of oil combustion due to the development or occurrence of oil scraper piston rings. The engine has an increased oil consumption, when exhausting from the exhaust pipe is strong, blue is smoking, the smell of exhaust is similar to motorcycle.
If you want to have less trouble with your engine, don’t think of candles only when the engine refuses to work. The manufacturer guarantees trouble-free operation of the spark on a serviceable engine of 30 thousand kilometers. But you, in turn, do not forget to check the condition of the candles with each oil change or, on average, every 10 thousand kilometers of run. First of all, it is adjustment of a gap to the required size, removal of a deposit. Is it better to remove the nagar with a metal brush, the ceramic of the central electrode is destroyed by sandblasting, and you risk getting a copy from the photo? 7. I would also recommend replacing the spark plugs, this is due to the different temperature conditions of the cylinders.

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