A situation where turning the key in the ignition leads to vigorous rotation of the starter, but the engine Daewoo Lanos remains silent, familiar to many owners of this model. Unlike the cases when the starter is silent and only relay clicks are heard, here the mechanical part of the crankshaft rotation is working properly, and the problem lies in one of three systems: fuel supply, spark generation or gas distribution. There is no need to panic, since competent sequential diagnostics allows you to identify a malfunction even in the field without sophisticated equipment.
Most often, the reason for the lack of starting is a banal lack of gasoline in the ramp or a missing spark at the candles. However, in the case of Lanos 1.5 or 1.6, more complex scenarios related to electronics or a broken timing belt cannot be ruled out. Understanding the logic of the engine control system MEMS or Mikas will help you quickly localize a node that has stopped performing its function.
Before you get into the engine, make sure of the basics: the fuel level in the tank, the presence of a signal on the dashboard and the battery charge. Sometimes the problem is solved by restarting or waiting until the fuel pump creates the necessary pressure in the system. Let's look at a step-by-step algorithm of actions that will save you time and money on calling a tow truck.
⚠️ Attention! When carrying out work in the engine compartment, especially those related to the ignition system and fuel rail, follow safety precautions. Open flames and sparks near gasoline are not allowed.
Fuel supply system diagnostics
The first step is to understand whether gasoline is entering the cylinders. Owners Daewoo Lanos often encounter failure of the fuel pump or its relay. When you turn on the ignition, until the starter cranks, you should hear a characteristic hum of the pump, lasting 2-3 seconds. If there is silence, the problem may be in the fuse, the pump itself, or the wiring.
Checking the fuel rail pressure is the most reliable way to rule out a fuel system problem. To do this, you will need a pressure gauge, but you can get by with improvised means by unscrewing the supply tube and directing the stream into the container (being careful!). The pressure must be stable and consistent with the norm, otherwise the injectors simply will not be able to spray fuel.
A common cause is also a dirty fuel filter or fuel pump strainer. If the car has not been serviced for a long time, debris in the tank could completely block the supply channel. In winter, it is worth considering the risk of condensate freezing in the fuel system, which also blocks starting.
Don't forget about the quality of the fuel. Low octane gasoline or water in the tank may cause the engine to crank but not start. In such cases checking spark plugs will show their filling and change in color of soot.
Checking the ignition system and spark plugs
If the fuel is in order, we move on to the spark. On Lanos with an 8-valve engine, a distributor system or an ignition module is used (depending on the year of manufacture and the type of ECU). The lack of a spark can be caused by a breakdown of high-voltage wires, especially in wet weather.
For diagnostics, unscrew one spark plug, put an armored wire on it and press the thread to the “ground” (engine). When the starter is cranked, a powerful blue spark should jump between the electrodes. If there is no spark or it is weak, reddish, the problem is in the coil, module, Hall sensor or switch.
The condition of the candles themselves is also critical. The gap should be within normal limits, and the electrodes should be dry (if you did not try to start the car “all the way” by filling the cylinders). Black carbon deposits indicate a rich mixture, white carbon deposits indicate a poor mixture or overheating.
- 🔌 BB wires: Check them for cracks and holes in the dark.
- 🕯️ Spark plugs: Clean off carbon deposits or replace with new ones with the correct heat rating.
- ⚙️ Crankshaft position sensor: Its malfunction completely blocks sparking.
⚠️ Attention! When checking the spark, do not hold the spark plug with your hands or touch metal parts of the engine while cranking to avoid electric shock, which, although not fatal, is very unpleasant.
Pay special attention to the crankshaft position sensor (CPS). This is the "main" sensor for the ECU. If he does not see the flywheel rotating, the computer simply does not give the command to supply fuel and spark. On Lanos It is located at the front of the engine, next to the crankshaft pulley, and often suffers from dirt and.
Clean the crankshaft position sensor every time you change the oil. The magnetic core collects metal shavings, which leads to signal distortion and unstable motor operation.
Mechanical problems and timing
The most unpleasant scenario is when the starter turns, compression is there, spark and fuel are present, but the engine is silent or makes strange sounds. This may indicate a violation of the valve timing. If the timing belt has jumped a few teeth or broken, the valves open at the wrong times and the engine may not start.
Checking the timing belt for Daewoo Lanos mandatory if the mileage since the last replacement is high or there are doubts about its tension. Remove the top protective cover and visually assess the condition of the belt. If it is intact, check the marks on the pulleys. A shift of the marks even by one tooth can result in the car not starting.
Another mechanical reason is low compression. Wear of the piston group, stuck rings or burnt-out valves lead to the fact that the air-fuel mixture is not compressed to the required pressure and does not ignite. Measuring compression with a compression meter will give an accurate answer: normal values for 1.5 liters should be no lower than 10-11 atmospheres.
| Symptom | Probable Cause | Test method |
|---|---|---|
| The starter turns easily, there are no flashes | No compression (timing belt) | Visual inspection of timing marks |
| The engine catches on but stalls | Air leak, low fuel pressure | Measuring rail pressure, checking vacuum |
| The starter turns with force, smoke from the exhaust | Engine jamming, water hammer | Checking the rotation of the HF pulley manually |
| Popping sounds in the intake manifold | Incorrect timing phases, distributor breakdown | Checking spark and marks |
Engine control electronics and sensors
Modern versions Lanosa controlled by electronic units MEMS or Mikas 7.6. An electronic malfunction can completely paralyze the launch. Often the immobilizer is the culprit: if it does not see the chip in the key or the antenna around the ignition switch is faulty, the control unit blocks starting.
Pay attention to the "Check Engine" indicator. If, when you turn on the ignition, it does not light up at all, the ECU itself may be faulty, there is no power to the unit, or the controller fuse has blown. If it lights up constantly and does not go out after starting (if you were able to start it), there is an error in the system.
The most important role is played by the coolant temperature sensor (CTS). If it “lies” and shows the ECU that the engine is hot when it is actually cold (or vice versa), the mixture will not be prepared correctly. A cold, rich mixture will flood the candles; a hot, poor mixture will not cause a flash.
Secrets of the immobilizer on Lanos
If you have a standard immobilizer installed, try connecting its connector directly, bypassing it during diagnostics (if you know the diagram) or using a spare key. The contacts in the antenna connector often oxidize.
It is also worth checking the engine ground. Poor contact of the ground wire with the body or engine leads to chaotic voltage surges, which is why the ECU may reboot when the starter cranks.
Influence of weather conditions and fuel
In winter, the problem “the starter turns, but does not start” gets worse. Cold, thick oil makes cranking difficult, a discharged battery gives a weak spark, and condensation in the tank turns to ice. In cold weather, the starting algorithm changes: an accurate dosage of fuel and a strong spark are required.
If Lanos It won't start in cold weather, try blowing out the spark plugs. Press the gas pedal all the way (cylinder purging mode when the injectors are turned off) and turn the starter for 5-7 seconds. This will remove excess gasoline from the cylinders. Then try starting again normally.
- ❄️ Use “Quick Start” spray (ether) to make starting easier, but in a very dosed manner.
- 🔋 Warm up the battery before starting by turning on the headlights for 1-2 minutes.
- ⛽ Add a special dehydrator to the tank to remove water from the fuel.
The quality of gasoline plays a decisive role. If you refueled at a questionable gas station, perhaps the octane number has dropped so much that detonation does not allow the engine to develop speed, or there is a lot of water in the tank. In this case, only draining the fuel and flushing the system will help.
⚠️ Attention! Excessive use of Quick Start Spray can cause intake manifold failure or even an explosion in the intake. Use it only if you are sure there is spark and compression.
☑️ Express startup diagnostics
Specifics of 1.5 and 1.6 liter engines
Engines MeMZ 1.5 and OpEc 1.6, installed on Lanos, have their own characteristics. One and a half liter engines are more sensitive to setting the ignition timing (IPA). If the distributor marks are knocked down or the Hall sensor is faulty, it is extremely difficult to start them.
Sixteen-valve versions (1.6) are equipped with individual coils or an ignition module without a distributor. A common problem here is the failure of one of the coils or the module as a whole. Also on 16-valve engines there are higher requirements for the condition of the spark plugs and the gap.
On both types of engines, the idle air control (IAC) is critical. Although it is responsible for idling, its jamming in the closed position prevents air from entering the manifold during startup, and the engine "chokes" even if it catches.
A unique feature of Lanos is the ability to start with a faulty air temperature sensor, but with a faulty coolant (coolant), starting is often impossible due to incorrect calculation of the mixture.
What NOT to do when trying to start
When trying to start a car, owners often make mistakes that only aggravate the situation. Prolonged cranking of the starter (more than 10 seconds in a row) leads to overheating and deep discharge of the battery. Be sure to take breaks between attempts.
You shouldn’t endlessly pour “Quick Start” in the hope that the engine will start. This erodes the oil film in the cylinders and can lead to scuffing. In addition, you simply fill the spark plugs with gasoline, and then the engine will definitely not start without drying or replacing them.
If after 3-5 attempts the engine does not start, stop turning the starter. Continuing to try will only drain the battery, and then nothing will definitely work. It is better to spend time on a quality diagnosis of the cause.
The main reason for the problems with launching Lanos is an integrated approach. Do not change all the sensors in a row, but check the system sequentially: fuel -> spark -> compression -> synchronization.
Frequently asked questions (FAQ)
Why does Lanos start and immediately stall?
Most often this is due to a malfunction of the idle air control (IAC), leakage of unaccounted air through the pipes, or a malfunction of the throttle position sensor. It is also worth checking the fuel pressure: if the pump pumps, but the pressure regulator does not hold, the ramp becomes empty immediately after the starter stops.
Can the immobilizer block starting if the starter turns?
Yes, on Daewoo Lanos With a standard immobilizer, the system can allow the starter to rotate, but block the supply of fuel or spark. In this case, the immobilizer light on the dashboard usually flashes and the engine does not catch.
How to check a fuel pump without a pressure gauge?
You can disconnect the fuel hose from the ramp (observing fire safety precautions), insert it into the bottle and turn on the ignition. The pump should produce a powerful stream of gasoline. If the stream is weak or absent, the problem is in the pump, filter or wiring.
What to do if the battery runs out during diagnostics?
Try to “light” from another car. If the starter turns sluggishly, it will not start. You can also try push starting (for manual transmission only), but this is a temporary measure that requires the main engine systems to be in good working order.
Does the alternator belt affect engine starting?
The alternator belt itself does not affect starting unless it is jammed. However, if the generator is jammed, it will be extremely difficult for the starter to crank the engine, and it will feel like the battery is dead or the engine is jammed. Check that the generator pulley rotates freely.