During interruptions, the engine idles unevenly, does not develop sufficient power, and consumes gasoline excessively. Interruptions, as a rule, are explained by a malfunction of the injectors or an electric fuel pump (for more details, see "Engine Control System"), a malfunction of the spark plug of one of the cylinders, or air leaks into one of the cylinders. You need to find the problem and fix it if possible.
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1. Start the engine and let it idle. Go to the exhaust pipe and listen to the sound of the exhaust. You can bring your hand to the cut of the exhaust pipe - so interruptions are felt better. The sound should be smooth, "soft", of one tone. Pops from the exhaust pipe at regular intervals indicate that one cylinder is not working due to the failure of the candle, the absence of a spark on it, the failure of the nozzle, a strong air leak into one cylinder or a significant decrease in compression in it. Popping at irregular intervals is due to dirty injector nozzles, heavy wear or dirty spark plugs. If pops occur at irregular intervals, you can try to replace the entire set of candles yourself, regardless of mileage and appearance, but it is better to do this after contacting a car service to diagnose and repair the engine control system. |
2. If the popping is regular, stop the engine and open hood. Check the condition of the ignition wires. High-voltage wires must not have insulation damage, and their lugs must not be oxidized. If there is damage to the wires, replace the defective wire. |
Carefully inspect the candles and compare their appearance with the photographs at the end of the subsection. The gap between the electrodes of the spark plug should be 0.8–0.9 mm. If the candle is black and damp, it can be discarded.
Reliable contact of the body or threaded part of the candle with the "mass" is optional, but desirable. Connect the high voltage wire from cylinder 1 to the spare spark plug. Start the engine. If engine interruptions do not increase, replace the spark plug in the 1st cylinder with a known good one. Put on the high voltage wire and start the engine. If interruptions have increased, consistently repeat the procedure of step 6 with all cylinders to identify a faulty candle.
If, as a result of the measures taken, engine interruptions are not eliminated, contact a car service to diagnose the ignition system at the stand or diagnose the engine - measuring compression. Normal compression - more than 1.1 MPa (11 kgf / cm 2 ), the difference is more than 0.1 MPa (1 kgf / cm 2 ) in one cylinder indicates the need for engine repair.
If engine interruptions stopped, diagnostics and replacement of the vacuum brake booster are required (see section 8 "Brake system").
If engine interruptions continue, try pouring a liquid like WD-40 on the outside of the hose. If engine interruptions stopped at least for a short period of time, try replacing the hose - it may have a break in it.
Diagnostics of the engine condition by the appearance of spark plugs
Brown or greyish-yellowish color and slight wear of the electrodes. Accurate thermal value for engine and operating conditions.
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.
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 piston group of the engine. Replace spark plugs.
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 conformity of the type of spark plug, the serviceability of the knock sensor, the cleanliness of the injector nozzles and the fuel filter, the operation of the cooling and lubrication systems.
The insulator is yellowish, glazed. Indicates that the temperature in the combustion chamber rises unexpectedly during hard acceleration of the vehicle. Normal deposits become conductive. Causes misfires at high speeds.
Deposits from the combustion chamber fall between the electrodes. "Heavy" deposits are collected in the gap between the electrodes and form a bridge. The candle ceases to work and the cylinder is switched off from work. Identify the faulty spark plug and remove deposits between the electrodes.
Hello! My car Daewoo Matiz 0.8 2007 starts from half a turn in the morning. Starts up after driving too. After parking for 1-1.5 hours, it does not start, there is no spark. With a longer parking, it starts up again with a half turn. The impression is that at a certain temperature of the engine or interior, a spark disappears.
Hello. Our specialist in this industry has prepared an answer. We hope this helps you solve the problem.
Daewoo Matiz
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Why does Matiz not start hot?
- Many motorists with such a problem are looking for a malfunction in the spark plugs. This is partly true, but if the car starts up cold (with no problems), then the candles are most likely in good condition. But think - even if starting the engine in the morning sometimes has problems starting, then pay attention to the candles. They need to be dismantled and visually inspected, cleaning may help. Next, consider both the most common and less common causes of such a malfunction.
- If at the same time there is a high consumption of gasoline, and even the engine is troit, then attention should be paid to working capacity. These are the wires that connect the spark plugs. In this case, the engine can also troit. Please note that the problem can also occur on relatively new cars. In practice, we met Matiz, whose mileage was 50 thousand km, but these vehicles needed to be replaced with high-voltage wires.
- Pay attention to the air filter. If the problem lies in it, then the impossibility of starting the motor takes place. True, such a malfunction manifests itself equally on both hot and cold internal combustion engines.
- The most common cause is a clogged injector. Often, Matiz owners cannot start an internal combustion engine due to a clogged injector, diagnostics and cleaning will completely solve this breakdown.
- In addition, it will not be superfluous to clean the idle speed controller along with the throttle body.
- If the proper level of pressure in the fuel line is not maintained with the engine turned off, then the malfunction may be a malfunction of the fuel valve or injectors. First you need to rinse the nozzles and evaluate the result.
- It is possible that the cause of such a malfunction is the fuel pump or distributor stylus. The fuel pump should be cleaned, if this element is unstable, then the pump motor should be replaced. Also, malfunctions with the start may be the result of a non-working (or incorrectly working) distributor stylus.
Here is a list of the most common causes associated with difficulty starting an internal combustion engine. We hope our recommendations will help you solve this breakdown.
Video "The process of diagnosing a car Daewoo Matiz"
For information on how the diagnostic procedure for a Matiz vehicle is carried out, see the video.
For owners of Daewoo Matiz cars, the uneven operation of the engine "set the teeth on edge." There are not only a decrease in power, but also a significant increase in fuel consumption, as well as uneven idling (triple). How to get rid of this problem once and for all?
How is Daewoo Matiz diagnosed?
In order to understand what is really wrong with the “engine” of Deo Matiz, you need to follow these steps:
- Start the engine, get out of the car and listen for sounds from the exhaust pipe. The sound of the motor should be smooth; if there are interruptions, at least one of the cylinders is not working properly. Jumps at irregular intervals indicate a strong wear of engine elements (candles, nozzles). If the intervals are equal, open the hood and check the wiring system. All wires must be with intact insulation, and the lugs without signs of oxidation.
- Remove the wire ends (holding on to the end, not the wire, so that it does not break), turn the spark plugs out and check their condition.
This is how it is possible to quickly detect a problem and quickly eliminate it if it is insignificant (for example, by replacing candles or restoring wire insulation). However, if the breakdown is serious, it is better not to climb into the internal combustion engine with your own hands.
The main reasons for the uneven operation of the Matiz engine
Matiz owners so often turn to car services with complaints about ICE repairs that typical ways to solve problems with motors have been known for a long time.
Fault: too large gap between the electrodes of the candles.
Remedy: it is necessary to bend the electrodes with a special probe and replace the candles.
Malfunction: when checking with an ohmmeter, a break in the winding of the coil unit was detected.
Remedy: it is necessary to replace the unit and high-voltage wires.
Fault: the marks on the camshaft and crankshaft pulleys do not match, which indicates a violation of the gas distribution in the system.
Remedy: adjust the location of the shafts according to the marks.
Malfunction: the idle speed regulator is broken (detected when a known working regulator is installed in the system and the engine is started).
Remedy: replace the regulator (sometimes it is enough to replace the throttle assembly).
Malfunction: the throttle valve or its electric actuator sticks.
Remedy: it is necessary to adjust the tension of the cable or replace the assembly completely.
To be sure that the cause of uneven engine operation is correctly determined in a garage, the car owner can only if he has sufficient experience and the necessary tools. If the driver is familiar with the device of his car "in so far as", it is certainly better for him to contact a service center for qualified help.
