The situation when Lada Granta starts and immediately dies is familiar to many owners of a budget sedan. This is a common problem that can catch the driver off guard at the most inopportune moment, such as a cold winter morning or in a dense city stream. The engine is started by the starter, but after a second the revolutions fall to zero, and the engine stops, requiring a second attempt to start.
The reasons for this behavior in a car can be many: from banal poor-quality fuel to serious failures in electronics or engine mechanics. Most often, the culprits are elements of the engine control system, such as: Idle control or Throttle position sensor. Understanding the principle of operation of these nodes will help to quickly localize the malfunction and avoid unnecessary spending money on the service.
In this article, we will discuss the main breakdown scenarios when VA 2190 It's dead right after launch. We will look at both software failures and physical malfunctions that require mechanic intervention. Competent diagnosis will save you time and nerves, allowing you to return the car to the service on your own.
Electronic gas pedal and "electronic throttle"
Modern versions of Lad Grant are equipped with an electronic throttle control system (E-gas). If your Grant starts and dies, and the “Check Engine” lamp lights up on the dashboard, the problem with a high degree of probability lies here. The electronic control unit (ECU) may incorrectly read the position of the pedal or the valve itself, going into emergency mode, in which the engine stalls for safety.
Often the cause is a mismatch in the position of the throttle. This happens when the ECU “forgets” the extreme positions of the damper or receives conflicting signals from sensors. In this case, an adaptation procedure is required. It is also worth checking the wiring connectors suitable for the throttle: oxidation of contacts or rubbed wires can cause short-term circuit breaks, which leads to a stop of the motor.
⚠️ Note: If after starting the engine keeps speed, but when pressing the gas pedal Grant stops, in any case do not continue to move. This is a sign of a critical malfunction of the throttle control system, which can lead to loss of control over the car.
For primary diagnosis, you can try to reset adaptations. This requires:
- 🔌 Remove the negative terminal from the battery for 10-15 minutes.
- 🚗 Press the brake pedal 20-30 times with the terminal removed (for the discharge of capacitors).
- 🔋 Put the terminal back on and turn on the ignition for 1 minute without starting the engine.
- 🔄 Turn off the ignition and repeat the switching procedure again.
If the problem persists after these manipulations, a deeper diagnosis using the OBD-II scanner will be required. Errors related to the throttle position sensor (TPP) often indicate the need to replace the entire throttle assembly, as sensors on Grants often do not change separately.
Why is a throttle node called an “electronic” one?
In older cars, the valve was controlled by a cable that went directly from the gas pedal. In Lada Granta, the pedal is simply a potentiometer that transmits a signal to a computer that opens the valve itself through an electric motor. This allows for stability and cruise control systems, but adds vulnerabilities in the form of electronics.
Idle regulator (RX) and DMRW
If your LADA Grant starts and stalls at idle speeds, but when adding gas works normally, you should pay attention to the idling support system. On 8-valve engines VAZ-11186 and 11187 is responsible for this Idle control (RXX). This is a stepper motor that passes air bypassing the closed throttle.
Over time, the rod of RXX overgrown with tan and oily deposits, which leads to its jamming. If the valve is frozen in the closed position, the engine does not have enough air to work on idles, and it deafens immediately after the starter releases. Similar symptoms may cause a malfunctioning Air mass flow sensor (DMRV) which incorrectly calculates the amount of incoming oxygen.
The verification of RX includes the following steps:
- 🔧 Remove the regulator from the throttle node (two bolts).
- 🧹 Carefully clean the rod and spring with a carburetor cleaner.
- 📏 Check the course of the rod: when the ignition is turned on, it must be extended.
- 🌬️ Blow the channel of the installation of RX on the throttle from dirt.
☑️ Diagnostics of RX
It is important to note that on 16-valve engines (VAZ-21126, 21127) the role of the throttle itself performs the role of the arch, so there is no separate regulator there. In such cases, throttle cleaning and adaptation are the main methods of combating floating revolutions and stalling motion.
Fuel system: pressure and injectors
Unstable engine operation and stopping immediately after start-up are often associated with a lack of fuel in the ramp. If Grant starts the second or third time and dies, it is possible that the system has dropped pressure or "died" the gas pump. The normal pressure in the fuel ramp should be about 3.8-4.0 atmospheres. If it is much lower, nozzles will not be able to create a quality mixture.
A common problem is clogging of the gas pump mesh, which is in the tank. Mud and rust from the walls of the tank clog the rough cleaning filter, and the pump cannot pump the right amount of gasoline. Also worth paying attention to the fuel filter fine cleaning, which is located under the bottom of the car.
Check the pressure in the fuel ramp with a pressure gauge before replacing the pump. Often the problem lies in a clogged filter or pressure regulator, rather than in the pump itself, which will be cheaper.
Symptoms of problems with the fuel system:
- ⛽ The engine is twitching and twitching before stopping.
- 📉 It is stale under load or with a sharp press on the gas.
- 🔊 The sound of the gas pump becomes quieter or intermittent.
| Element of the system | Symptom of malfunction | Method of decision |
|---|---|---|
| Benzonesus | No hum when ignition is turned on, low pressure | Replacement of pump or motor module |
| Pump grid | It's dead at high speeds, launch with pause. | Washing or replacing the net |
| Fuel filter | Power drop, jerks during acceleration | Replacement of the filter (every 30 thousand) km |
| Pressure regulator | Long launch, dead on singles. | Replacement of the regulator (in the tank or ramp) |
Ignition system: candles and coils
In the ignition system of Lada Grant may also hide the reasons that the car starts and immediately stalls. If the spark is weak or disappears immediately after starting, combustion of the mixture becomes impossible. The main suspects here are spark-plug and ignition (coil)
Spark plugs are consumable material that requires regular replacement. Nagar, increased gap between electrodes or insulator breakdown lead to ignition misses. This is especially true for engines with 16 valves, where each cylinder has two candles (in older versions) or an individual coil. If one of the candles is dead, the engine will work extremely unstable and may stall.
⚠️ Note: When diagnosing a ignition system, use only serviceable high-voltage wires and tools with insulated handles. Electric shock from the ignition coil can be dangerous to health.
How to check the ignition coil without a stand?
The easiest way is the method of exclusion. If the engine is triple, swap the coils (or candles) between the cylinders. If the "trot" will go to another cylinder, then the rearranged element is defective.
Signs of ignition problems:
- ⚡ Visual breakdown of the spark on the engine body in the dark.
- 🌫️ Black soda on the candle electrodes.
- 📉 Hard launch in wet weather.
Air suction and vacuum hoses
The internal combustion engine runs on a mixture of air and fuel. If the intake system gets extra, not recorded by sensors air, the mixture becomes too poor, and the engine dies. This phenomenon is called air-suck. In Lada Granta, there are quite a lot of places for a potential sucker, especially with the age of the car.
First of all, you should check the integrity of the pipes going from the air filter to the throttle assembly. Cracks on the corrugated pipe, weakened clamps or dried nozzle sealing rings can let air through. It is also worth inspecting the crankcase gas ventilation hose (PCV system).
Unaccounted air suction is one of the most difficult to diagnose problems, since visually cracks on the pipes may not be noticeable. Use the Quick Start spray to look for leaks: If the revs change when splashing on the joints, you found a hole.
Main points of inspection for the pump:
- 🔍 The joint of the intake manifold and the cylinder head.
- 🛢️ Fuel nozzle sealing rings.
- 🌬️ Fuel pressure control hose.
Sensors and electrical circuits (DPKV, DPRV)
Critical to the operation of the engine are Crackshaft position sensor (DPKV) and Switch-shaft position sensor (DPRV, phase). If the WPC stops signaling the position of the pistons, the ECU stops supplying spark and fuel, and the engine stops instantly.
Often the problem lies not in the sensor itself, but in the contamination of its end with metal shavings or in the wiring break. On Grants, the wiring of the DPCV takes place in the immediate vicinity of the hot collector and can be rubbed or melted. It is also worth checking the connectors: oxidation of contacts inside the chip can cause signal loss.
| Sensor. | Impact on launch | Frequent malfunction |
|---|---|---|
| DPC | The engine does not start or stops immediately. | Wire break, magnet contamination |
| DPR | Launch possible, but work is unstable | Failure of phases, chain break |
| Oxygen sensor | It's dead on the engine. | Lead poisoning, cliff break |
Frequent Questions and Answers (FAQ)
Why does Granta stop cold but start hot?
The problem is probably in Idle control (RXX) or low pressure in the fuel ramp. A cold engine requires an enriched mixture, and if the RX does not open the channel or the pump does not pump enough pressure, the motor stalls. It is also possible to suck air through seals of nozzles, which manifests itself only with cold gaps.
The grant starts and stalls: what to do first?
First, check if the lamp is on. Check Engine. If it burns, you need a computer diagnostic. If not, try removing the battery plug for 10 minutes to reset the ECU errors. Then check the condition of the candles and the pressure in the fuel ramp.
Could the bad gas make Grant start and die?
Yes, poor-quality fuel with a high content of water or foreign impurities can cause ignition misses and engine stoppage. Water trapped in the cylinders does not allow the mixture to ignite. It is recommended to drain fuel and pour quality gasoline from a proven gas station.
How to check the throttle position sensor with a multimeter?
It is necessary to remove the connector from the DPDPZ, turn on the ignition and ring the power chain. Then connect the probes to the signal wire and smoothly press the gas pedal. The voltage readings shall be changed smoothly from 0.5 to 4.5 volts. Voltage surges or dips indicate a malfunction of the sensor tracks.