How to check the spark on the benzotrimmer

How to test a spark on a candle?

Often, the chainsaw may not start due to the lack of a spark on the spark plug. How can you test a spark on a candle? The easiest way, which is recommended by experienced chainsaw owners, is to unscrew the candle, and then put a high-voltage wire on it. Then it is necessary to ensure the contact of the candle body in the part where the thread is located, and the cylinder block. Next, pull the starter handle, as usual when starting the tool.

After such actions, a bright blue spark should appear. If there is fuel in the tank and its supply is open, but there is no spark, the magneto is malfunctioning or there is a wire break. Check the integrity of the electrical circuit and magneto.

check, spark, benzotrimmer

A popular question is also this: the chainsaw will not start, but there is a spark. what to do? The first thing to do is to check if the breather is working properly, if the air filter is in good condition. The filter is easy to clean from dirt, if it is worn out, just replace it with a new one.

The breather should be checked for blockage. If a part is clogged, it can be easily identified by disconnecting the fuel hose and observing how the fuel flows. If the flow of the gasoline mixture is normal, then the breather is working, if the flow is very weak or absent, clean the breather.

A video with a simple way to check a spark on a candle:

Chainsaw ignition coil. we check, replace, adjust

Checking the ignition coil is performed in the following ways:

  • measuring the resistance of the coil (a multimeter is used for this method), the disadvantage of this method is its relative complexity, because cold semiconductor elements will not show a coil malfunction, they need to be heated and special conditions for testing are required;
  • spark testing device. This device is inserted into the gap between the high-voltage wire and the candle. Usually, such devices are available only in service centers, in everyday life due to the high price they are not used.
  • By inverting the candle. In this way, the presence of a spark is checked. but it does not give an accurate idea of ​​the state of the ignition coil.

You can adjust the ignition coil of the chainsaw as follows:

  • after loosening the bolts holding the ignition system, the magnets should be brought to the coil;
  • an adjustment plate is clamped between the coil and the flywheel, then the bolts are tightened;
  • the plate is taken out;
  • the flywheel is rotated in full rotation 2-3 times, making sure that it does not cling to the coil, after which the chainsaw is assembled.

How to check the ignition on a chainsaw. using the Druzhba chainsaw as an example:

How to check the ignition coil with a multimeter. video

Determine the availability of fuel and its supply.

First you need to make sure that there is a fuel mixture in the tank of a chainsaw that does not want to start, and it regularly enters the carburetor. With a full tank, we check how the mixture is fed through the gas line. Disconnect the fuel system pipe from the carburetor and try to pump it up. In the case of a complete order, when pumping up, gasoline will be supplied in jerks in accordance with the norms set by the manufacturer. Poor or no fuel supply may result from:

  • The fuel supply channel is clogged;
  • Debris-clogged fuel filter.

Often the reason for a poor start of the chainsaw can be a tank that is too full. In this case, you should pay attention to the presence of smudges under the saw case cover. If present, see the connection of the gasoline feed pipe to the carburetor. Most often, it is squeezed out by pressure when the tank cap is screwed on, which is filled under the very neck, which prevents the engine from starting.

The quality of the fuel mixture can also be one of the reasons why the chainsaw does not start. If, after completing the work, the remaining gasoline is not drained, and the tool is left for long-term storage (more than 2 weeks), then the processes of resin formation and polymerization of the components will begin to occur inside the tank. What can cause carbon deposits on the piston, rings and cylinder liner. Therefore, always prepare the mixture only in the required amount before work.

Identifying and eliminating obvious chainsaw malfunctions.

To determine the reason why the chainsaw does not start or stalls when starting, it is necessary to troubleshoot the tool. The essence of the procedure is to consistently inspect the condition and operation of the main working elements of the saw motor. At this stage, we check:

  • Spark plug present;
  • Fuel supply;
  • Filter status;
  • The operation of the breather of the stalling unit built into the fuel cap;
  • Discharge duct function.

The reason for flooding and throwing a candle on a chainsaw

Often, owners of chainsaws are faced with such a problem. they fill a candle on a chainsaw. This should not happen, normally the candle should always be dry. Occasionally owners use the term “throwing a candle”. This describes the same problem. candle flooding.

Let’s look at the reasons for such a malfunction and find out why the candle on the chainsaw starts to fill.

After identifying the problem, try to fix it immediately. Follow these steps:

  • check the condition of the plug. It is advisable to carry out this check every 15 working hours. If the engine is not disturbed, the fork will be covered with light brown carbon;
  • if the carbon deposit is black, it fills the candle due to the fact that the mixture of air and fuel in the combustion chamber is not balanced, and little air enters. You should also check the gap between the electrodes;
  • if there is corrosion on the plug or the distance between the electrodes is very large, the fuel mixture is lean;
  • a plug wet with oil indicates an oil leak;
  • if the deposits on the fork are light brown, and the gap is normal, you do not need to do anything with the fork. just put it back in place and the chainsaw will work normally;
  • black carbon is removed with sandpaper, and the gap is adjusted with pliers;
  • if the plug is badly worn out, replacement is required. the degree of wear is checked with a plug tester. The weaker and more irregular the spark, the more worn out the spark plug.

The reason for a wet candle is fuel over-enrichment. The disproportion of the fuel mixture in the event that there is not enough air in it can be caused by the following factors:

  • poor quality gasoline (always fill the tool with high quality fuel);
  • incorrect starting sequence of the chainsaw;
  • clogging of the air filter and the need to replace it;
  • ignition failures;
  • unadjusted carburetor.
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Important! Ignition adjustment is only required if the spark plug is wet! With a dry candle, you should not interfere with the ignition.

Video. why he pours a candle on a chainsaw:

How to check the spark on a chainsaw candle

Checking the spark on the spark plug and eliminating the causes.

The first step in finding the reasons why the gasoline saw won’t start is to check the spark on the spark plug. There are many factors that affect the performance of this element. However, the main ones at the initial stage of instrument troubleshooting are:

  • Incorrect carburetor adjustment;
  • The presence of more than it should be, the amount of oil in gasoline;
  • Clogged air filter.

All of them contribute to the formation of carbon deposits on the spark plug electrodes. In 50 cases out of 100, the saws do not start on a cold one due to the absence of a spark due to carbon deposits on the electrodes and their corrosion. As a result, the gap either decreases or increases.

Checking the spark plug with an idle chainsaw

It is quite easy to check for a spark. This will require:

  • Remove the tip of the high-voltage wire;
  • Unscrew the candle;
  • Put the tip back on;
  • Lean the candle with a skirt against the cylinder;
  • Start with a starter.

If a good spark is observed between the electrodes at the time of starting the engine of the chainsaw, then everything is in order with the ignition unit. If it is not there, then it is worth cleaning the element itself and checking the gap of the electrodes. If necessary, use a special probe to adjust the distance between the contacts.

For candles from different manufacturers, the distance between the electrodes may fluctuate. For some, it may be equal to 0.5 mm. Others have 0.2 mm. Therefore, carefully study the manufacturer’s recommendations.

There may be no spark on the spark plug for other reasons. Of the main faults affecting the poor start of the chainsaw and the unstable operation of the internal combustion engine at idle, from which the tool can stall, the following can be attributed:

  • Overflow of the spark plug channel with fuel;
  • Lack of contact between the high-voltage cradle and the tip of the candle;
  • Failure of the ignition unit.

How to start a cold chainsaw if the spark plug channel is constantly flooding with gasoline? To eliminate the problem while starting the tool, you can use the following algorithm:

  • Unscrew the candle with a special key;
  • Wipe it with a clean and dry cloth;
  • Dry for 20. 30 minutes;
  • Remove carbon deposits with a file and adjust the gap between the electrodes;
  • Drain the remaining fuel from the spark plug channel and dry it;
  • Collect everything and try to start the mechanism.

As a rule, these measures are enough to start the chainsaw and get the job done. However, this extreme measure does not eliminate the main reason why the engine does not start or stalls. improper operation of the carburetor, which needs fine adjustment.

If there is no spark and poor contact of the high-voltage cradle with the spark plug tip, check the connection. The check can be done using a conventional tester. If a defect is found and it is eliminated, the chainsaw should start without any problems.

If the check showed that the contact is reliable, and the saw does not start further, look for the cause in the ignition unit. As a rule, a faulty unit cannot be repaired and restored. A complete replacement is required here.

Ignition model and BB wires

Instructions from the book on repairing VAZ cars, which use an ignition module with high-voltage wires. The section “Checking the ignition system” provides a method to check the spark on the spark plug.

Caution: Electric shock during spark testing can be serious. Therefore, handle the high-voltage wire with a thick rubber glove or, in extreme cases, pliers with insulated handles.


  • Remove the spark plug.
  • Insert the spark plug into the lug of the high voltage wire.
  • Press the metal part of the spark plug to the ground of the car (for example, to the engine)
  • Ask an assistant to turn on the starter.

The spark plug test process is also shown in

How to check a spark plug with your own hands

Why won’t the engine start? There may be several reasons for the malfunction: the starting system, the power supply system, or the ignition system does not work. In the latter case, the presence of a spark should be checked. We figure out how to do it yourself (on an injector or carburetor).

Individual ignition coils (IKZ)


  • Unscrew the candles
  • We install them on the IKZ.
  • We supply “ground” to the candles with a wire from the negative terminal of the battery.
  • Turn off the power to the injectors.
  • We rotate the starter and observe the spark of the spark plugs.

How to check the spark plug correctly

The methods described above do not give a 100% guarantee. The fact is that it is easy to break through a charge in air at atmospheric pressure. And when the spark plug is in the cylinder at high pressure, where resistance increases, it is harder to break through the charge. As a result: at atmospheric pressure there can be a spark, but in the cylinder the spark can “sew” in all directions and through the insulator. It can work normally in idle mode, and give breakdowns at 6000 rpm.

To test the spark of a spark plug for sure, use a pressure test bench. Or replace the candles with new ones.

Weak spark? Earlier we talked about how to strengthen it.

The main reasons why there is no spark

  • problem with spark plugs (flooded or out of order);
  • breakdown of high-voltage wires or loss of contact;
  • the reason is in the crankshaft sensor (check with a multimeter is required);
  • malfunction in the ignition module;
  • failure of the ignition coil;
  • the problem is in the switch;
  • distributor malfunction (burned contacts, loss of clearance);
  • poor contact of the ground wire;
  • failure or malfunction of the ECU.

No spark injector

It is recommended to use a spark gap in order to understand at what stage there is no spark on the candles (not from the distributor, not from the coil, or already directly from the candle itself).
In the absence of a spark in all cylinders at the same time, there may be several culprits:

  • controller;
  • the whole module;
  • coil or center wire.

If there is no spark from the ignition coil, then the cause can be hidden in many places. First of all, you need to check the high-voltage armored wire, which should be in perfect condition and without breaking the insulation. Otherwise, the wire must be replaced.

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No spark, candle check

If the problem persists, then we check the spark plugs. The contacts of the candles must be clean. The fact that there is no spark may be the fault of contaminated spark plug contacts. It is best to replace the candles, but you can also clean the contacts. But before changing the candles, check if the discharge reaches the candles themselves. To do this, remove the spark plug wire and bring it to the car body at a distance of 0.5 cm. Rotate the starter several times and see if there is a spark between the wire and the body. The spark should be white with a light blue tint. If it is absent or present, but with a different shade, we can say that the candles are in order, and the problem is precisely in the heart of the car’s ignition system. the coil.

How to test a spark

There are several ways to check the spark on a candle:

  • Check for weight (the plug body is pressed against the engine and the spark is analyzed when the starter rotates).
  • Checking the candle with a multimeter (you can determine the breakdown of the candle).
  • Diagnostics with a tester based on a piezoelectric element (the test principle is similar to the breakdown to ground method, the presence of a spark is determined and is mainly used on injection vehicles).

No spark

When the spark has disappeared, you, of course, will never start the car, and in such a situation, first of all, you need to check the ignition system.

The ignition system of a car plays a key role in its operation. If, with many other malfunctions, the car can be delivered to the service station on its own, then in case of problems with ignition it is unlikely that it will be possible to start the engine.

How to check the spark on the ignition coil

To see if the coil is working at all, remove the wire from the distributor-breaker that goes from the coil. The same test is carried out with it as with the wires of the candles, namely, they bring the wire at a distance of 0.5 cm and turn the starter. Now, regardless of the result, we can accurately talk about the cause of the breakdown.

Checking the ignition coil

In the first case, you need to check the contacts in the distributor-breaker for oxidation, insulation failure, and also check the serviceability of the rotor. If there is no spark due to it, then the rotor must be replaced.

Checking the ignition coil also consists in inspecting the integrity of the windings for physical damage, as well as burnt points, which indicate a short circuit in the coil. In these cases, the coil must either be repaired or replaced.

If, after the checks, you understand that there is a spark in the car, but it does not start, then the ignition switch may need to be replaced.

Diagnostics of high-voltage wires

High voltage wire breakdown is another common reason why a spark fails. It is advisable for the driver to inspect the wires, starting with the cables that go to the candles. We remove the tip from the spark plug, inspect the wire for rupture, abrasion, insulation integrity, check the condition of the tips. We check the performance of the cable itself with a multimeter.

You can check the quality of the current that passes through the cc, the wire can be done in another way, but the help of a partner is required. We remove the wire from the candle, bring it to the body without touching the metal, then turn the starter for 2-3 seconds. Working wires give out a stable spark of white glow with a blue tint to the tip.

Spark missing. reasons

When checking, attention is paid not only to components and assemblies, but also to the condition of the wiring connections, the cleanliness of the terminals. What to check:

  • terminals;
  • Battery;
  • High voltage wires;
  • distributor;
  • low voltage system;
  • candles.

Signs to check spark plugs

An unscheduled spark plug check is always associated with incorrect engine operation. We carry out an inspection if, during the operation of the car, we notice the following signs:

  • The motor starts to start after a long rotation of the starter or does not start at all.
  • The engine runs intermittently at idle, troit, twitches while driving.
  • Fuel consumption increases.
  • Dynamics deteriorates, engine loses power.

The negative consequence of a malfunctioning spark plug is the accumulation of the fuel mixture in the combustion chamber and its detonation. This will lead to deformation of the connecting rod, breakage of pistons, crankshaft and other components of the power unit.

Spark missing on the car: causes and diagnostic methods

Any ignition-related breakdown will cause the engine to jerk, triple, lose traction, or the engine will not start. The main reason is the missing spark on the spark plug. How to check a spark on a car, what are the reasons for its absence, how to check the strength. further in the material.

Battery diagnostics

A low battery charge, contact breakdown is the reason that a spark is not formed. A sign that the battery is running out is an uncharacteristically quiet car horn and dimming lights on the dashboard when starting the engine. What needs to be checked:

  • Battery terminals. If traces of oxidation are visible, clean and tighten the terminals. Graphite grease helps prevent oxide formation.
  • Capacity. Recharge.


If the wires, contacts, battery capacity and candles are checked, but there is no spark, the coils are next on the check list. We remove the main wire from the cover and bring it to the ground, while turning the starter. A faulty coil prevents a spark from forming, and if a bright, stable spark is observed, the distributor is faulty.

During diagnostics, we carefully look at all the terminals. acidified contacts lead to a weak spark or to its absence.

How-to Check for Spark

How to check the strength of a spark

To form a spark, we check the quality of the current flow throughout the circuit. We carry out diagnostics of the wires with a tester, connecting each wire in turn. The resistance of the working cable is in the range of 3.5-10 kOhm. specifically, what resistance is required for a particular VV wire is indicated on the braid of the spare part.

If the engine troit at idle speed, a drop in thrust is observed, check the ignition module. We connect one tip of the tester to the connector of the device, connect the second to ground, start the motor. If the module is good, the tester will stop at 2W. For any deviation from the value, check the ignition module, fuses.

The strength of the spark depends on the condition of the spark plug. We remove each part from the block, check for the degree of burnout of the electrode, clean the carbon deposits. If there are traces of oil on the electrode, this indicates wear on piston rings, valve guides, etc.

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You can check which candle is out of order in a simple way. We start the engine and remember its sound, and if the sound did not change when removing the candle wire, it means that this particular candle is out of order.

Checking the low voltage circuit

The reasons for the malfunction that lead to the absence of a spark on the candle:

  • breaker contacts oxidation;
  • a break in the wire connecting the breaker terminal with the lever;
  • wire breakage of the movable disk.

If the terminals are clogged with oxide, we clean the contacts, adjust the gap and check the current supply. If the contacts are broken, the wiring is restored.

We check the performance of the circuit using a 12-volt light bulb. We connect the light bulb on one side to the mass of the car, on the other. to the low voltage terminal, we close the contact. If the circuit works normally, the lamp extinguishes when the circuit is closed and is lit when the connector is.

If the control lamp does not light up when the contacts are connected, except for a break in the wires and a sour terminal, the reason for the absence of a spark may be in the burned out ignition coil.

If there is no spark on cars with an injection engine, we use a spark gap for diagnostics. We check the coil, main wire, controller, as well as the electronic unit module, fuses and bv wires.

No spark. possible causes

The main reasons for the absence of an ignition spark can be divided into the following groups:

If a spark is missing, when analyzing a complex malfunction, it is necessary to consistently monitor all possible causes in order to accurately establish the main source.

How to check the spark on the ignition coil

In most cases, to check for the presence of a spark, it is required to connect to the high-voltage output of the test spark plug coil, apply an ignition pulse to the low-voltage input. In some coils of older versions, the coil can be checked autonomously (without a car). For this:

With this method, the spark may be slightly noticeable, especially in the case of electronic ignition coils.

How to check the spark on a spark plug

There are several methods for controlling the presence of a spark on a candle:

Attention! During this operation, you should take precautions not to touch the metal body of the candle. The voltage of the high-voltage spark pulse is more than 10 kilovolts. This could result in electric shock. High-voltage damage is especially dangerous for people with problems of the cardiovascular system.

Visual inspection is best done in a slightly darkened room; an assistant is required for this.

Video. why there is no spark on VAZ injection cars (Kalina, 2109, 2110, 2114, 2115):

Thus, if a spark breaks through the end of the wire at a distance of 4 mm to the metal part of the engine, then the impulse voltage is more than 20 kilovolts.

A special spark indicator can be purchased.

Warning! With this method of control, you need to be even more careful, since the electric current can flow through the assistant who is holding the high-voltage wire. In this case, special rubber gloves may not prevent injury: their standard breakdown value is only 6.3 kilovolts. It is better to use a bulky dry rag as an additional insulator.

Using a pilot gas discharge lamp. Such a probe can be made independently using a gas-discharge lamp and a high-resistance resistor (of the order of several megaohms). Various probe options can be found on Aliexpress. SEE OPTIONS.

Video. there is no spark on the Volkswagen Passat, the auto electrician finds out the reasons:

How to check a spark on an injection engine. what are the features

Most modern injection engines are equipped with individual or prefabricated ignition coils (multiple ignition coils in one housing). This design simplifies assembly, repair and maintenance.

Along with this, it (design) complicates the process of controlling the presence of a spark. To carry out this operation, it is required to dismantle the individual (combined) ignition coil, reconnect it to the power connector, put the spark plug on the high-voltage output, connect it to the engine body, and attempt to start. In some models of motors and coils, this operation is structurally difficult.

Video. how to check the spark on the injector spark plug using special indicators:

A selection of various inexpensive automotive ignition testers can be viewed HERE.

What to do if there is no ignition spark

Lack of an ignition spark is one of the probable problems of starting gasoline engines.

Almost all repairs related to an internal combustion engine begin with a spark check.

Why there may be a weak spark on the spark plugs

A weak spark on the spark plugs is possible for the following reasons:

Most car enthusiasts believe that the main reason for the loss of a spark is a malfunction of the ignition coil. Experience shows that this is far from the case. On this occasion, there is a well-known driver’s saying: “It was not the reel,…. sat in the cockpit. In order not to be in the role of a careless driver, all possible reasons for the absence of a spark should be investigated.

What does the P0420 error code say and how it can be fixed.

When to change spark plugs and what it depends on.

Video. there is no spark on the VAZ 2110, troubleshooting: