Stihl Stalls At Idle

Stihl Stalls At Idle

The situation when the engine stalls at idle occurs quite often. This phenomenon can occur both on cars with high mileage and on new cars. It is worth noting that the process of starting a cold engine with a starter can be both initially difficult and absolutely normal.

In other words, the engine can start well “cold” or “hot,” but then it starts to stall at idle. Also, in some cases, it is manifested that when you press the gas pedal and increase the speed, the motor starts to work stably. There are several main reasons why the engine "does not hold" idle, troits and shakes. Next, we will examine why the machine stalls idling or runs very unevenly after starting “cold”, in transition modes “hot”, etc.

Gasoline engine does not keep idle

To begin with, this malfunction indicates two possible causes: failure of individual mechanisms, components or sensors, as well as severe pollution of certain elements. Both in the first and in the second case, it is necessary to conduct a diagnosis. The engine on injection and carburetor cars most often can stall at idle in such cases:

  • the idle speed controller (IAC) is out of order;
  • the throttle is dirty or malfunctioning;
  • the carburetor channels are clogged or the fuel jet XX is dirty;
  • reduced or impaired performance of injection nozzles;
  • the mesh of the fuel electro / mechanical pump is clogged, malfunctions of this node have occurred
  • there was a decrease in the throughput of the fuel filter;
  • dirty air filter, intake air inlet;
  • failure of the mass air flow sensor, throttle position sensor, etc.
  • clogged crankcase ventilation system;
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If the car immediately stalls or the speed is noticeably floating after the starter is turned off, then you should pay attention to the throttle assembly. The option of both clogging the damper, and wedging mechanism. This malfunction, especially severe pollution, occurs as a result of long driving with low quality fuel, as well as untimely replacement of the air filter.

In this case, the throttle must be cleaned. To clean the throttle, a conventional “carbliner” (a tool for cleaning carburetors) is used, and it is also necessary to blow off the damper using compressed air from the compressor. If these steps did not help, then you need to evaluate the condition of the oil trap. This element is an integral part of the crankcase ventilation system. Contamination of the oil trap causes the crankcase gases to “choke” the motor, idle floats and the ICE stalls.

Now let’s look at the situation when the car starts up normally, but then starts to stall (constantly or with a certain frequency). A similar situation often occurs on injection cars that have an electronic engine control system (ECM).

Video: Stihl Stalls At Idle


Owners of cars that have long been in operation, it is advisable to have these sensors in stock, as well as a multimeter for self-diagnosis. This is especially necessary if the car is often used for long trips on the highway. Note that most of these sensors have an acceptable cost.

Another important point is that the machine may begin to stall at idle after flashing the computer. Unprofessional correction of the factory firmware, flashing or chip tuning of the electronic engine control unit can lead to malfunctions. Although the motor after such actions demonstrates better returns under load, at high speeds, etc., in parallel, the unit is not able to operate normally at 750-800 rpm. In this case, the installed firmware should be adjusted to achieve stable operation of the internal combustion engine in all modes.

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Now a few words about the carburetor. The engine often stalls on such engines precisely because of the contamination of the nozzles and the prolonged lack of proper carburetor adjustment. The fact is that even small particles of garbage in the fuel can disrupt the operation of the carburetor injection. Dirt can be contained both in low-grade gasoline and also enter the system from a gas tank, in which deposits gradually accumulate.

Such a tool is a solvent cleaner in an aerosol can. As for the mechanical fuel pump of carburetor engines, this type of pump has a filter screen. The specified element may also clog, reducing the performance of the pump. The membrane of a mechanical gasoline pump can also fail. In parallel with wear, the membrane particles clog the channels in the carburetor.

The situation with the injection system on the injector is more complicated. If replacing the ECM sensors does not help, then you should start checking the intake manifold for suction of excess air at the inlet, and also eliminate the air in the fuel system. Then you need to go on to check the injection nozzles, measure the pressure in the fuel rail, inspect the vacuum hoses, etc. Special attention will be required to the brake servo. We also add that regardless of the type of injection (engines with an injector or carburetor) it is necessary to check the ignition, spark plugs, high-voltage wires, distribution coil and other elements of the system.

Diesel stalls at idle

The problems described above of gasoline ICEs associated with working on the twentieth are not about Bosch or diesel engines. A frequent malfunction of diesel engines is a malfunction in the high-pressure fuel pump (TNVD). Natural wear of plunger couples, the presence of impurities in diesel fuel or air intake of the high-pressure fuel pump causes the diesel engine to start and then stall.

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What is the result

Finally, we add that the fuel lines, connections and hoses are rubber products. For this reason, it should be remembered that there is a natural aging of rubber. On cars that are more than 10 years old, cracking of rubber hoses becomes frequent, which leads to air leaks. It should be added that the external condition of such hoses is not an accurate indicator of their condition. The inner surface of the walls also collapses, which leads to imperceptible outside particles entering the injector, carburetor or high pressure fuel pump, especially in cases of a problem in the areas behind the fuel filter.

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