Cold start of the car engine. Free Technical Library article

Free technical library

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Schemes of radio-electronic and electrical devices

Cold start car engine

Free technical library

Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic fuel injection

Comments on the article

With the onset of frosty weather, many car owners have a problem starting a cold engine. In this article, I want to share the experience of starting engines that started normally yesterday, but today they do not show promise. We are talking about cars that do not have obvious signs of ignition and fuel injection system malfunctions. If you encounter problems starting the engine in frosty weather, first of all, you should determine the main factor - the composition of the fuel mixture. To do this, it is enough to remove one of the spark plugs from the engine and conduct a visual inspection of it. If there are black (or very dark) deposits on the candle, the fuel mixture is quite rich, which means that not everything is in perfect order with the ignition system on the car. Most often, in such cases, it is enough to replace the candles and the engine starts to normal. If there is no dark soot on the removed candle, we are talking about a poor fuel mixture.

In this case, the coolant temperature sensor is often the culprit. It should be noted that often these are thermal sensors of previously overheated engines. If the engine was previously subjected to overheating, I strongly recommend checking the temperature sensor and replacing it, if necessary, with a serviceable one. Otherwise, you will constantly have problems starting the engine in frosty weather. With a lean fuel mixture, some car owners try to start the engine with various additives that increase the octane number of the fuel. Sometimes they succeed. Another method that is often used in this situation is the injection of ether compounds to start carbureted engines. This method can be considered quite expensive, and most importantly, very problematic.

In the cold, dealing with depressurization of the intake tract, and then doing all this in the reverse order is not pleasant enough. In addition, this operation does not guarantee you a successful launch, in the absence of proper experience. In my opinion, the easiest way to start a cold engine is to simulate its lower temperature using a conventional variable resistor (potentiometer) with a nominal value of 5.6 - 8.2 kOhm. To do this (with the ignition off), disconnect the connector of the standard coolant temperature sensor and connect a potentiometer instead of this sensor.

The resistance level should first be set to about 4 kOhm and try to start the engine. If the engine does not start, the resistance must be increased.

After starting the engine, its speed X.X. are often significantly overestimated. In this case, use the potentiometer to bring them to the required value. Similarly, as the engine warms up. After warming up, it is better to turn off the ignition and connect the standard temperature sensor O.Zh. Another cause of a lean fuel mixture can be insufficient fuel pressure in the system. There are basically two reasons for this. It's either a dying fuel pump or a fuel pressure regulator. If there is a malfunction in the fuel pump, it may become impossible to start the engine.

Sometimes the fuel pressure in the system can be raised to the optimum by plugging the drain hose. To do this, it is enough just to squeeze it. It should be noted that the hose must be pinched very carefully, because. in extreme cold, it can simply burst. After starting the engine, continue to pinch the hose for no more than 8-10 seconds. Otherwise, it is likely that the spark plugs will be spattered with too rich a fuel mixture. If after that the engine stalls, the operation should be repeated without increasing the time for pinching the fuel drain hose into the tank. It is better in this case to let the engine warm up in starting mode until it stops stalling if you have resumed draining the fuel.

The most common cause of problems starting a cold engine can be the usual depressurization of the intake tract. Most often, we are talking about a jumped off (sometimes burst) tube that connects the fuel pressure regulator in the system to the intake manifold. Carefully inspect the connections of all pipes (hoses, etc.) that go from the intake tract to other systems or elements (brake system, adsorber, engine crankcase ventilation, etc.) and if there are serviceable elements of the injection system, problems with cold start on your car will not.

In conclusion, I want to note that some car owners blame the lambda probe (exhaust oxygen sensor) for cold start problems. This is a mistake. O2 is not taken into account when starting a cold engine; it starts working only after warming up to operating temperature.

Publication: cxem.net

See other articles Section Automobile. Electronic fuel injection

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive

Skin blood vessels 19.07.2006

Two patients in Argentina suffering from lower limb vein thrombosis received veins made from their own skin.

Doctors took skin samples the size of a postage stamp from patients under local anesthesia, placed them on a nutrient medium and grew a thin layer of cells. Then they rolled this layer into rolls 17 centimeters long and half a centimeter in diameter, allowed the new vessels to grow together into tubes and transplanted them to patients, replacing the parts of the veins affected by thrombosis. The threat of amputation of the legs disappeared.

In England, a clinical experiment was successfully carried out with the replacement of grown vessels of narrowed coronary vessels of the heart.

News feed of science and technology, new electronics

We recommend downloading in our Free technical library:

▪ section of the site For a beginner radio amateur

▪ magazines Radio Television Electronics (annual archives)

▪ book Electromagnetic powder clutches and brakes. Mogilevsky V.G., 1964

▪ article What is a fruit fly? Detailed answer

▪ article Amphibian Mini-mokik. Personal transport

▪ article Water level control sensor. Encyclopedia of radio electronics and electrical engineering

▪ reference Entering the foreign TV service mode. Book #10

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews