The car has just finished maintenance and the fuel consumption has gone up. It is because of the neglect of this part!

Many owners will encounter such a problem. After the maintenance, they found that the fuel consumption of the car has increased. Originally, the fuel consumption per 100 kilometers was 78 liters. After the maintenance, the fuel consumption was even close to 10 liters. The high level of scary people was very distressing for many owners. Was cheated by the 4s shop, but it is not.

There are many reasons for the increase in fuel consumption. However, spark plugs are often the most easily overlooked. Today, the masters simply talk about spark plugs.

First of all we have to understand what the spark plug is!

Baidu Encyclopedia of the explanation: spark plug is the gasoline engine ignition system will be high voltage current into the cylinder to produce sparks to ignite combustible gas mixture components. Mainly consists of wiring nut, insulator, wiring screw, center electrode, side electrode and shell, and the side electrode is welded on the shell.

To put it simply, it's just like a lighter thing, just like the electrons inside a lighter that many boys play when they are young. The principle is similar but only the spark plug is high voltage electricity.

Why spark plugs are often the easiest to ignore?

Because the general automobile maintenance manuals are required to replace the 20,000 km, but the old drivers will always say that the spark plug is okay, running a re-transition of 180000 is also okay, indeed, a good sheet metal spark plug really You can use 100,000 kilometers, which is why you ignore spark plugs when doing maintenance.

What does spark plugs have to do with fuel consumption?

We all know that a gasoline engine generates power by combusting a mixture of fuel and air, but this mixture itself does not burn. It cannot be driven by high temperature compression like a diesel engine. It must be achieved through ignition, so the gasoline engine is lit. Style.

Spark plugs generate sparks through the discharge between the electrodes and ignite the gas mixture. When there is a problem with the spark plug, it is bound to cause the engine to misfire or the combustion is not sufficient, then the most direct effect of incomplete combustion is fuel consumption.

How often is it replaced?

Because of the different materials of spark plugs, the types of spark plugs can be divided into: common copper core, sheet metal, platinum, sheet metal, and platinum-iridium alloy spark plugs. The service life of these types of spark plugs is different, and the corresponding replacement mileage is also different. Make clear when choosing.

Under normal circumstances, the service life of ordinary copper cores is about 20,000 kilometers, while the service life of spark plugs with precious metal materials is 6 to 90,000 kilometers. The maintenance cycles specified by automobile manufacturers of different models are not exactly the same, so the specific replacement cycle should also be Automotive manufacturer's regulatory standards.

Then, when you find that your car has a sudden increase in fuel consumption or low-speed jitter, you need to check your spark plugs, then how to check, please also look down.

How to determine if the spark plug is damaged?

1. Short-circuit test: When the car is idle, use a screwdriver to perform a short-circuit test on the spark plug (must be cylinder-by-cylinder). Listen carefully to the engine speed and sound changes. If there is not much change before and after, it indicates that the spark plug is normal. No need to replace it.

2. Skipping test: Unscrew the spark plug and place it on the cylinder block. Test the fire with the high-voltage wire. If there is no spark or the spark is weak, it indicates that the spark plug is leaking or does not work.

3. Observe the color: Remove the spark plug and observe the appearance of the spark plug according to the following appearance color:

(1) If it is auburn or rust, it indicates that the spark plug is normal;

(2) If it is oil stained, it indicates that the spark plug gap is out of adjustment or the oil supply is too high, and the high voltage line is short circuited or open circuited;

(3) If the spark plug is severely ablated, there is a phenomenon such as creping, black lines, cracking, and electrode melting at the top. This indicates that the spark plug has been damaged and must be replaced immediately.

How to buy a spark plug?

The brands of spark plugs that are commonly seen on the market today include Bosch in Germany, Denso in Japan, NGK in Japan, AC Deco in the United States, and Autolite in the United States. Pay attention to look at different brands of spark plugs when buying, to avoid buying the wrong model.

In general, the price of spark plugs ranges from tens to hundreds of yuan, but it is necessary to purchase genuine parts of well-known brands in order to avoid adverse damage to the engine.

The master concluded that the spark plug is a very small and inconsequential part, but its role is very large, and daily maintenance and replacement of the spark plug must be done to ensure that the engine is economical and safe to operate and to avoid unnecessary trouble.