Diagnostics of the engine condition by the appearance of Hyundai Solaris spark plugs

Parts and consumables:

• Gasoline (if necessary)
• Toothbrush (if needed)
• Orthophosphoric acid (if necessary)
• Small container (if needed)
• Running water (if needed)
• Spark plugs (if needed) (18855-10080)

1. Normal spark plugs for Hyundai Solaris are brown or grayish-yellowish in color and have a slight wear on the electrodes. Exact match of the thermal value of the spark plug for the engine and operating conditions.

normal candle.

Useful advice:

When replacing spark plugs with new ones, use spark plugs with the same specifications as recommended by the manufacturer.

2.  Dry soot deposits indicate a rich air-fuel mixture or delayed ignition. Causes misfiring, difficult starting and erratic engine operation. Check if the air filter is clogged, if the coolant temperature and intake air temperature sensors are working.

Black soot on Hyundai spark plugs.

Useful advice:

Use a hotter candle.​

3.  Oily electrodes and spark plug insulator. The reason is oil getting into the combustion chamber. Oil enters the combustion chamber through valve guides or piston rings. Causes difficult starting, misfiring of the cylinder and "twitching" of the running engine. It is necessary to repair the cylinder head and the piston group of the engine. Replace spark plugs.

Candles are covered with Hyundai oil.

4. Deposits on the skirt of the insulator of brick-red iron oxides from anti-knock iron-containing additives (ferrocenes) to gasoline. Lay down in an even, dense layer. When the engine is running with a heavy load, under the influence of high temperature and pressure in the combustion chamber, the oxides are reduced into conductive paths of pure iron, which close the central electrode to ground. This causes misfiring and, as a result, a drop in engine power and increased fuel consumption. In addition, the exhaust gas catalytic converter can be damaged, which overheats greatly when gasoline that has not burned out in the engine cylinders enters it. Plaque is practically not removed mechanically and does not burn out during prolonged movement at high speed. If this plaque appears on new candles after a short run,

Red soot on candles Hyundai.

Useful advice:

Replacing spark plugs Hyundai Solaris is described in this article . If it is not possible to immediately replace the candles with new ones, try to remove this coating by immersing the candles with skirts of insulators in phosphoric acid or a rust converter (contains phosphoric acid) for ten minutes. After that, clean the plaque with a non-metallic brush (you can use an old toothbrush) and rinse the candles first with water and then with gasoline.​

5.  Melted electrodes. The insulator is white, but may be dirty due to spark gaps and deposits from the combustion chamber falling on it. May cause engine damage. It is necessary to check the type of spark plug, the cleanliness of the injector nozzles and the fuel filter, the operation of the cooling and lubrication systems.

Melted spark plug electrode.

6. Detonation.  The insulator may be cracked or chipped, which can damage the piston. Make sure the octane rating of the gasoline is correct.

Cracked Hyundai spark plug insulator.

Note:

Similarly, the insulator can crack near the spark plug electrode.

7. Mechanical damage.  Damage can be caused by foreign objects entering the combustion chamber, and if too long a spark plug is used, its electrodes can catch on the piston. This leads to the destruction of the candle, the shutdown of the cylinder and may damage the piston. Remove foreign object from cylinder and/or replace spark plug.

Bent spark plug electrode.

The article is missing:

• Tool photo:
• Photo of parts and consumables

Source:  http://carpedia.club/