✅ Why Kamaz doesn’t start well

Main signs of failure to start the engine
Reasons why the engine does not start
What can be done, options for eliminating the cause
Malfunction in detail by engine models
Fault in detail by environmental class
Malfunction in detail for the KamAZ model range
Details by purpose
A story from our repair practice
KamAZ periodically stalls while driving

Causes of malfunctions

One of the possible breakdowns is that the KamAZ control system does not turn on the starter, although the engine start key is turned correctly. In this situation, the cause of the malfunction is related to the electronic equipment. The following reasons are considered:

lack of supply voltage on the unit that is responsible for controlling the motor;
breakdown of the main relay of the vehicle;
faulty condition of the ignition switch;
technical faults of the tire;
breakdown of the relay that determines the operation of the starter;
faulty wiring, as it is responsible for the performance of individual units;
breakdown of the relay and fuse box;
breakdown of the lock used in the ignition system.

Sometimes the starter turns, but does not start. If KamAZ does not start, the exact reasons are determined for subsequent repairs. At the same time, failures of the motor, starter or other components of the technical system are identified.

Note! Sometimes the starter turns, but the engine does not respond. The cause of the breakdown may be electrical or mechanical.

Frequent causes of vehicle malfunctions:

malfunction of the injection pump, power unit, valves, injectors;
equipment contamination;
lack of fuel or low quality.

If KamAZ does not start and the starter does not turn, diagnostics of the vehicle becomes mandatory.

Working principle of VR

A constant plus is supplied from the battery to the upper power bolt of the “traction” bolt. In the free state, the contact plate does not touch the “nickels” of the power bolts in the cover. Both windings – the pull winding (VO) and the holding winding (CU), are connected with one terminal to a small “control” terminal, which receives the starting pulse from the ignition key (plus). The second output - a more powerful VO - goes to the jumper with the lower power bolt (plus of the starter electric motor), and the OU - to the “ground” (housing).

Starter connection diagram

As soon as the ignition key closes the power supply circuit to the VO, the current in it will create a magnetic field, under the influence of which the core will move inside the housing, push the bendix forward, and press the plate to the terminals. The plate will create a “short path” for high voltage current - from the top bolt, to the bottom and to the starter brushes. When the current flows through it, the “minus” disappears from the traction winding. Now only the holding one starts working, which is still energized (and will be as long as the ignition key remains in the “Start” position).

Possible fuel system problems

If the KamAZ Euro 4 does not start for a long time, the reason must be correctly determined. The fuel system must be checked. It is recommended to exclude problems with the following units:

electric and mechanical fuel pump;
injector;
carburetor;
fuel filters and lines.

Important! Sometimes the units remain in good working order, but clogging of the installed filters interferes with the operation of the power unit. In addition, violation of the basic rules for operating a car and its fuel will lead to undesirable consequences.

The engine can only operate properly if the fuel system meets standards and is of high quality. If the KamAZ Euro 3 engine does not start immediately and the fuel system meets the standards, the ignition devices are additionally checked. It is for this reason that it is extremely important to use high-quality fuel and carry out regular maintenance to extend the life of the vehicle.

Possible malfunctions of the ignition system

The ignition system is checked if the starter turns and gasoline is supplied to the engine, but the engine cannot be started. Spark plugs and high-voltage wires are excluded from the list, since these units cannot break down at the same time. If KamAZ does not start, the reasons can only be determined through diagnostics.

Important! In the most difficult cases, the problem may be caused by a blown fuse, power failure, relay failure, contact damage, or engine ECU malfunction.

In this case, comprehensive diagnostics may be required, the results of which will determine the condition of the vehicle. You can also read about Wheel alignment on KamAZ - How to do it right.

KAMAZ Oka 1994, 29 l. With. — electronics

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Comments 10

Today I’m having the same problem, maybe you can give me some advice. When I get into the car, the turn signal relay starts clicking, the ignition goes out and the radio doesn’t work either. It doesn’t turn at all, the relay either clicks or doesn’t. I washed the mounting block with electrical contact fluid a month ago. Oxidation there was a lot on it...

There may be a ground wire from the battery. Or the battery is weak

The weight is normal, I checked it. The battery is also normal. I answered above, this could just happen on the fly.

I wrote it wrong. Positive wire. In short, a year ago there was such a topic, I hit a bump and the car stalled. I start everything up normally - it’s strange. Then it started to appear in turns or just like that, started it, started moving, and stalled. To an electrician, he spent an hour in the cabin and under the hood - he changed the relay, additional. threw a lot. I started it and turned it off all the time to see if it helped or not. As a result, I went to screw the wires myself and pulled the plus from the battery. In short, he got disheveled near the terminal under the casing and did some crap. I changed everything.

Yes, I think I watched it too. Strange. But thanks, I'll take a look again tomorrow =)

Exactly, the problem is somewhere in the direction of the “+” wire. But not at the terminal, because Everything is fine there, but somewhere deeper. I turn the key, pull the wire from the depths of the engine towards me, and the ignition appears =)

Motorists sometimes encounter the problem that KamAZ does not start and the vehicle turns out to be faulty. It is recommended to take into account the possible causes of vehicle breakdown.

Diagnostic specifics

The KamAZ engine can stall for various reasons, so you need to take into account the typical malfunctions for a specific car model. In some cases, clogs may occur due to low quality fuel, requiring professional cleaning.

In addition, each type of car requires special attention. For example, the battery of injection vehicles cannot be disconnected while the engine is running, you cannot perform actions with the batteries yourself, disconnect the ground on the car, or actively use charging and starting devices. When using diesel fuel, you need to remember that it is vulnerable to low air temperatures, as a result of which diesel sometimes freezes. The simplest are cars with gasoline engines, since they require a minimum of maintenance and are undemanding in terms of fuel and operating conditions.

KamAZ is also vulnerable to water, since its entry into the injector will lead to acidified contacts and breakdown of the technical system. To prevent unwanted problems, it is advisable to promptly change fuel filters and fill only high-quality fuel.

Tips for proper operation of KamAZ

KamAZ models 5350, 5490, 6520, 43118, 65115, 65201 deserve proper operation.

It is recommended to use only suitable fuel. Often gasoline or diesel worsens the performance of a vehicle.
A dirty air filter causes the KamAZ Euro 3 to take a long time to start. In this case, cleaning measures are carried out.
Dirty fuel filter. In this case, the engine is also unable to produce power or start. Only maintenance will prevent such contamination.
Mechanical engine failures. If the engine cannot be turned, evaluate the condition of the engine. If necessary, expensive repairs are carried out. The condition of the engine largely depends on proper driving.
A malfunction of the fuel system will also lead to the fact that the KamAZ Euro 3 will not start and the vehicle cannot be fully used. The reasons are different, so they are determined by the exact circumstances that negatively affect the technical condition of the machine. For this reason, driving rules and using suitable fuel are mandatory.

In cases where the KamAZ Cummins 6isbe engine does not start and nothing can be done, the best option would be to turn to professionals, determine the cause and normalize the technical condition of the car. It is important to understand that there can be many reasons for breakdowns, and the degree of severity varies. Only professionals will determine the exact cause and condition of the units to carry out repairs and perform maintenance work.

Engine stalls while driving

The engine stalls while driving , dynamic characteristics drop sharply, power is lost, systems stop working stably - signs indicating the presence of serious technical problems. There can be many reasons for their occurrence, since the motor operates under increased load. Here are the most common problems that cause the engine to stall while driving :

leakage of technical fluids: coolant, oil or their mixing due to depressurization of circuits. The reason is destruction of the structure of the cylinder head, depressurization of the radiator, damage, wear of pipes and hoses;
failure of fuel system elements, for example, spark plugs, injection pump, thermostat;
oxidation of sensor contacts or their breakdown;
the engine stalls while driving and does not start - one of the probable reasons is a malfunction of the engine control unit;
generator is faulty;
clogged air or fuel filter;
a faulty starter quickly discharges the battery, so the cause of the problem is often seen as battery wear;
failure of the shut-off valve, which leads to battery discharge.

If the truck stalls while driving , you need to stop, turn off the ignition and call qualified specialists from 24 Volt Truck Service to identify the causes and troubleshoot the problem. You should first check the fuel level in the tank, since its absence often leads to the engine stalling and no longer starting . The quality of the diesel engine also affects the performance characteristics of the engine and the wear rate of its components and assemblies.

It is prohibited to forcibly cool the power unit when overheating; this will provoke a change in the configuration of technical components. The result is a jammed motor, which will require its replacement or significant investment for restoration.

If a diesel engine stalls while driving, computer diagnostics should be carried out to determine the causes of malfunctions. The problem may lie in the injectors, power supply, or control unit. In some cases, faults are detected only by visual inspection using technical means or special techniques. The experience of the master plays an important role here.

Accurate identification of faults (error codes) is provided by certified computer systems using licensed software. The mobile workshops of “Cargo Service 24 Volt” are equipped with such equipment. This is a guarantee of accuracy and efficiency.

Continuing to drive with problems is dangerous, since at speed the control and braking systems may fail, which is associated with a risk to people’s lives and health, and material damage. “Cargo Service 24 Volt” will help you avoid financial losses and ensure safe traffic.

Symptoms of malfunction of fuel injection pump KAMAZ 740, fuel injection pump KAMAZ 4310

Malfunctions of fuel pumps and regulators manifest themselves in a violation of adjustment due to wear of parts, which results in the occurrence of extraneous noise, overheating and fuel leakage.

The main reason for the malfunction of the fuel pump is wear of its parts, weakening of the tightness in the fits, increased gaps in the moving joints, violation of the location of the parts, and deposits on the surface of the parts in the form of dirt and carbon deposits.

The consequence of pump malfunctions can be a decrease in the supply of fuel in the required quantity and uneven supply. Failure to properly supply fuel is usually caused by wear of plunger pairs, pump discharge valves, plunger drivers, rack clamps, rack teeth and bushing gears, and clogging of injectors. Such malfunctions lead to a decrease in engine power and efficiency.

Uneven supply of fuel to the engine cylinders will lead not only to unstable operation at low speeds, but also to interruptions in the operation of individual cylinders, which will be accompanied by vibration of the engine block.

Fuel injection pump malfunctions include uneven start of injection and delay in injection timing of a multi-section pump, which occurs due to wear of the pusher adjusting bolt, roller axis, pusher and roller housing, ball bearings, as well as wear of the cam shaft.

Wear of plunger pairs and injection valves significantly affects the change in the fuel injection advance angle.

The main reasons why the KAMAZ engine does not start:

There is no fuel in the fuel tank;
Presence of air in the fuel system;
Clogged or contaminated fuel lines of the KAMAZ power supply system;
The fuel has thickened due to low temperatures;
Malfunctions of the high pressure fuel pump (injection pump malfunctions)
Clogged fuel filters.

To determine the malfunction of the power system, you should follow the chain from less expensive and costly faults to more costly ones, taking into account the flow chart for repairing the power system.

Starter turns but won't start

If the starter of a KAMAZ truck spins when you turn the key in the ignition, but the engine does not show any signs. The cause of the breakdown may lie in both the electrical equipment of the car and the mechanics. The causes of electrical malfunctions can be as described above, except for faults associated with the starter and its circuits, plus the following reasons:

Failure of the high pressure fuel pump (HPF)
Mechanical engine failure
“Airing” of the fuel system
Lack of fuel in the tank
Fuel filter clogged
Clogged fuel lines
Check valve failure
Mechanical faults of injectors
The injectors are pouring
No or low pressure in the fuel system

A story from repair practice

The KAMAZ 740 engine does not develop full power

Replace the air filter;
Adjust the fuel supply angle;
Clean the injectors, adjust the injectors;
Repair the injection pump;
Check the operation of the KAMAZ injection pump.

Uneven operation of the KAMAZ 740, KAMAZ 4310 can be caused by loss of functionality of individual injectors, a malfunction of the high-pressure fuel pump or its regulator. Damaged injectors must be replaced, and the injection pump, as a more expensive part, is checked on a fuel stand and repaired if necessary.

Kamaz does not start well when cold, smokes white smoke | Topic author: Lyudmila

Ksenia is this normal, at what temperature is it bad?

Evgeniy White smoke - oil is burning. Lots of oil - look at the rings. There is a lot of oil and it’s bad - it doesn’t start well.

Stepan Air in the fuel system.

Andrey If it’s frosty outside, then this is a common occurrence for KAMAZ.

Katya, take the injectors and injection pump for adjustment; the white smoke says that the injection pump is set correctly - Vladislav and the injectors under pressure are just pissing and do not spray fuel oil

Christina smokes with heated white smoke. The reason may be a burst head.

For what reasons does a diesel engine smoke gray or blue smoke?

google.com/or "at . An example is that diesel is bad.

Toyota Camry which engine is better 2.0 2.5 or 3.5

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How to check the oil level in an automatic transmission Volkswagen Polo sedan

Hello everyone, help me solve the problem I have a KAMAZ with a Bosch injection pump and an electronic pedal, turn off and start with a key. The problem is that it is very difficult to start for a long time. You have to turn it for 5-10 seconds, then it works smoothly. does not go away. and regardless of whether it is cold or just turned off! Has anyone encountered this? GOOD LUCK TO EVERYONE ON THE ROAD.

Causes of malfunctions

lack of supply voltage on the unit that is responsible for controlling the motor;
breakdown of the main relay of the vehicle;
faulty condition of the ignition switch;
technical faults of the tire;
breakdown of the relay that determines the operation of the starter;
faulty wiring, as it is responsible for the performance of individual units;
breakdown of the relay and fuse box;
breakdown of the lock used in the ignition system.

Note! Sometimes the starter turns, but the engine does not respond. The cause of the breakdown may be electrical or mechanical.

Frequent causes of vehicle malfunctions:

malfunction of the injection pump, power unit, valves, injectors;
equipment contamination;
lack of fuel or low quality.

If KamAZ does not start and the starter does not turn, diagnostics of the vehicle becomes mandatory.

Glow plug relay and control unit

The battery is perfectly charged, the starter turns and turns, but the diesel engine still won’t start. There may be a problem with the glow plugs, which perform an important function - heating the working chamber of the cylinder, which contributes to the rapid self-ignition of diesel fuel. But, if the starter clicks but does not turn, then there may be a problem with the electrical or mechanical part of the starter, or the contacts on the battery.

Glow plugs are powered through a relay and have a control unit (control unit) with a timer. The control unit's timer turns on the glow plugs for a specified period of time. After the engine warms up to operating temperature, the relay stops powering the spark plugs. By the way, it is convenient, especially for cars with diesel engines, to install autonomous or electric pre-heaters, which greatly simplify starting and operate the engine in a gentle mode.

If one or two spark plugs fail, the engine can easily start cold or hot in the summer.

If even one glow plug is not working in winter, the car will no longer start or starts with difficulty when cold.

To check the functionality of the glow plugs, you need to unscrew them and measure the resistance with an ohmmeter or multimeter. The resistance value should be approximately the same.

Relay or electronic glow plug unit does not work

A properly working relay clicks when you turn the ignition key. The electronic control unit controls the operation of the glow plugs. If the relay does not click when you turn the ignition key before starting the diesel engine, it means that either the relay or the electronic unit has failed.

Possible fuel system problems

If the KamAZ Euro 4 does not start for a long time, the reason must be correctly determined. The fuel system must be checked. It is recommended to exclude problems with the following units:

electric and mechanical fuel pump;
injector;
carburetor;
fuel filters and lines.

Possible malfunctions of the ignition system

Important! In the most difficult cases, the problem may be caused by a blown fuse, power failure, relay failure, contact damage, or engine ECU malfunction.

In this case, comprehensive diagnostics may be required, the results of which will determine the condition of the vehicle. You can also read about Wheel alignment on KamAZ - How to do it right.

+7 (909)15-25-444 or

We will call you back!

Whatever the problem with the starter, we will quickly and efficiently fix the problem using special equipment.

If the engine of a KAMAZ Euro4 vehicle does not start, you first need to determine how the breakdown manifests itself.

There are two possible faults:

when the key is turned in the lock, the starter turns the crankshaft;
The starter mechanism does not turn on, as a result of which the engine does not turn over.

Diagnostic specifics

If KamAZ does not start, diagnostics are carried out taking into account the following aspects:

is there fuel in the tank and is the fuel pump working;
ignition system condition;
Is the engine crankshaft timing sensor working?
condition of injectors;
technical condition of the ECU.

Any KamAZ breakdown can be fixed, but the cost of repairs will vary.

It would be better if he was silent or why Kuznetsov is smoking

The captain of Admiral Kuznetsov explained why his ship was smoking heavily: This is not a sign of any malfunction.

USS Freedom (LCS-1) There were also smoking Mistrals and some kind of Spanish aircraft carrier from World War II. But as it should be in the propaganda media, people don’t think what will happen next, the main thing is a momentary answer to divert their eyes. Yes, smoke often pours out of the chimney when the engine or boiler is started: at this moment, the ship’s power plant is usually “cold” and there are a lot of transient processes present in it. Sometimes this can only be an instantaneous release of the fuel mixture or condensate from the exhaust pipes, but sometimes it can “smoke like a charm,” such as the American USS Freedom (LCS-1) or the Egyptian Mistral. At full speed, to put it mildly, they are generally smokeless - this is the same ship that was called a smoking stealth on NTV (photo above): Black smoke when starting diesel or turbine engines is often the cause of butthurt in the Western press. “This is how we will show our stars and stripes (or some other) flag to the Swedes?” To which the admirals honestly declare: “Be calm, we will enter Stockholm at full steam, without smoke!” But, as they say, anything can happen. But when moving on the open sea and at full speed, black (blue, white) smoke is, unfortunately, a sign that the ship’s propulsion system is suffering from one of the listed ailments: it eats and burns oil, evaporates completely inappropriate water or it “drinks”, no matter how into itself, excess fuel, throwing soot into the sky. But this has never happened before :)

In mid-October 2016, one of the images of the National Aeronautics and Space Agency (NASA), taken from a satellite, appeared on the Internet, in which a smoky trail left by the aircraft carrier Admiral Kuznetsov, sailing along the Atlantic coast, is visible from space [funny, fake ]

Tips for proper operation of KamAZ

KamAZ models 5350, 5490, 6520, 43118, 65115, 65201 deserve proper operation.

It is recommended to use only suitable fuel. Often gasoline or diesel worsens the performance of a vehicle.
A dirty air filter causes the KamAZ Euro 3 to take a long time to start. In this case, cleaning measures are carried out.
Dirty fuel filter. In this case, the engine is also unable to produce power or start. Only maintenance will prevent such contamination.
Mechanical engine failures. If the engine cannot be turned, evaluate the condition of the engine. If necessary, expensive repairs are carried out. The condition of the engine largely depends on proper driving.
A malfunction of the fuel system will also lead to the fact that the KamAZ Euro 3 will not start and the vehicle cannot be fully used. The reasons are different, so they are determined by the exact circumstances that negatively affect the technical condition of the machine. For this reason, driving rules and using suitable fuel are mandatory.

+7 (909)15-25-444 or

But even with such a repairable vehicle as a KamAZ, there will always be work for the “autoelectrici” . Sometimes a simple malfunction takes drivers a lot of time to identify and eliminate the causes. The situation became even worse when trucks of this brand appeared, equipped with imported engines. Serious differences in the design of electrics from older KamAZ brands baffle even experienced drivers.

Signature diseases

Often the cause of starter failure is cheap but necessary parts.
Because the quality of spare parts for domestically produced cars is very low quality, to put it mildly. And the ground wire, supplied through the blocking relay to the starter relay winding, makes it even more difficult to find the probable causes of the malfunction. It is no coincidence that KamAZ drivers with experience are well aware of the expression “short the brown wire to ground” - this is an old and reliable technique for monitoring the performance of the locking relay. Relay contacts made by dubious manufacturers, and sometimes simply homemade, do not have high-quality refractory soldering that would prevent them from quickly burning out. For this reason, the failure of contacts accelerates when the starter is turned off, and the current resistance increases. The resulting decrease in current in the coil of the solenoid relay prevents the starter from operating normally. The relay, it would seem, works as expected, but the weak current does not allow the power contacts to close. A fairly typical situation arises: the starter clicks, but the engine does not start. At first glance, the cause of the malfunction lies in the solenoid relay, but it may be of a different nature.

It’s not for nothing that they say that auto electrics is the science of mass. It’s hard to disagree with this: in many cases, really weak or missing contacts in the electrical circuit, failure of the ground switch are a common cause of malfunction of KamAZ starters.

Trucks equipped with a remote ground switch are especially susceptible to this. In this situation, weak contacts are still capable of supporting the operation of the main electrical circuit of the car, but are not able to ensure the movement of powerful starting currents of the starter.

Experienced technicians will repair the wiring or repair the starter at the site of the breakdown.