Many Lacetti owners have experienced vibration from the car and engine. This especially happens at idle. There are many reasons for the effect. Of course, the majority of motorists will say that the reason is trivial - a ruptured engine mount. But, in addition to the standard problem, there are a number of malfunctions that arise during the operation of the vehicle and will cause engine vibration.
Video
The video will tell you how to eliminate engine vibration on a Lacetti
What is vibration and how does a person feel it?
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Vibration, according to definition, is the mechanical vibration of a solid body. It can be transmitted to a person through contact with him (tactilely) or through an audio channel. It is felt by a person through the organs of hearing, tactile or vestibular apparatus. The main parameters of vibration are frequency and amplitude of vibration.
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Oscillation frequency is usually measured in Hertz. This is the number of vibrations per second. In a car, frequency is often measured in revolutions per minute. For example, 600 rpm. corresponds to a frequency of 600/60 = 10 Hertz, that is, 10 revolutions per second.
Good day to all. It's difficult to come up with something new. So let’s go down the path trodden by hundreds of potassium growers. A special feature of the first generation Kalina with an 8-valve engine is body vibration, which is especially noticeable by the butt meter in the region of 2000 crankshaft revolutions. It took me a long time to get used to the feeling of being in a vibrating chair))). Well, this didn’t happen at Tavria, but at number nine. One of the sources of transmission of vibration from the internal combustion engine to the body is the gearbox thrust. In particular its hinge. Another support-cushion for the internal combustion engine. If you still somehow struggled with the thrust joint: they installed a hinge from Avtoprodukt, made a homemade hinge from half of the stabilizer strut and Kalina’s own hinge, which is essentially the same hinge as the AP, or even removed the jet thrust altogether, then with the engine mounts in the pre-grant era there were no options. And now, like a miracle drug, I hold in my hands rubber products with the magical inscription Anvis.
Well, since I still have to crawl under the car, I’ll install a hinge from the AP to the heap.
Regarding the hinge: with the money paid for it you can buy a couple of “eggs” from which, using a grinder and welding, you will get four hinges from the AP. In short, the guys are doing such a good business. And so the car repair shop is open air. We provide easy access under the front of the car: a 50-piece board and two bars to help us.
I immediately apologize to the author of the letter, since in recent days I have had absolutely no time to even sit down at the computer. I had a few minutes of free time and decided to write a problem that a man had with his Kalina. The 1.4 16-valve engine, when idling, vibration comes from the engine, it is also transmitted to the gearshift handle, and accordingly, even from the sound of operation, you can hear that there are some strange interruptions.
In general, anyone who has encountered such a problem or has any assumptions, you can share your opinion on this matter. What do you say, gentlemen Kalinovody?
The main causes of vibration in a car
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The main causes of vibration in a car are associated with mechanical, sound and resonance phenomena. Since the vehicle moves as a whole during operation, the source of vibrations can be almost any element of its structure. The most common and noticeable sources of vibration in a car by the driver are:
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- Vibration of a car engine, gearbox, clutch
. It can occur due to engine tripping (inoperability of one or more cylinders). It appears at idle or low speeds in the form of uneven vibration of the body, gear lever, and interior elements. It may also be a consequence of uneven supply of fuel, air, or misfires. Vibration can be caused by vibrations in the flywheel, clutch system, or gearbox. In the high-frequency audio range, it is often caused by wear on the alternator belt.
- Engine mounts.
When the engine mounts are worn out or damaged, the oscillatory movements of the engine are directly transmitted to the body. In this case, the engine seems to knock on the body. Sound and mechanical vibrations are perceived by drivers like the sound of a jackhammer. At certain engine speeds they can increase many times over due to resonance phenomena.
- Cardan shaft in rear-wheel drive vehicles.
Occurs when the geometry of the cardan system or rear axle changes. The frequency directly depends on the vehicle speed. It is clearly noticeable in the form of a hum at speeds of 50 km/h.
- Body parts.
If parts are poorly secured or some elements are corroded, mechanical vibrations may occur, which can be amplified by resonance phenomena. Mechanical vibrations of body elements lead to their damage. The body part may simply fall off.
- Wheels.
When replacing or repairing wheels, mandatory balancing is required. During the operation of the wheel it may be damaged. Radial vibration of the wheel can be damped by the car's suspension and is almost imperceptible to the driver. It is almost invisible, but if present, it leads to a malfunction of the suspension system and a reduction in the service life of the hub bearings. Transverse wheel vibration is reflected in steering beats and leads to premature wear of the steering rack and rods.
Causes of malfunction
General view of the engine
As in any car, in the Lada Kalina, jerking at low speeds is the first sign of a malfunction in one of the systems. Let's look at where the main problems arise:
- The fuel system and its components can cause the problem.
- The ignition system is associated with the fact that the car jerks at low speeds.
- Another reason could be the gearbox.
To more accurately determine the causes of the malfunction, it is worth considering each system and component separately.
Fuel system
The car jerks at low speeds - this may be due to the fact that the engine does not receive enough fuel mixture.
The problem may lie in the fuel system. In this case, you will have to examine several elements that are part of it.
Fuel rail and fuel injectors
Let's look at finding the problem step by step:
- The first place to look for a problem is the fuel rail and injectors . It is the poor condition of this unit that can cause the car to jerk when accelerating.
- The fuel pump, filter and lines can cause the driver to feel slight jolts at low speeds. For diagnostics, you will need to remove the fuel pump from the gas tank housing.
The mesh (strainer) in the fuel pump on a Lada Kalina is clogged
You can diagnose these components and parts yourself or contact a car service center.
Ignition
The ignition system can cause the car to jerk at low speeds. Particular attention should be paid to the ignition switch, in which the contact connections may fail.
A red glow plug removed from the engine
The second reason could be the spark plugs. Their serviceability and contamination can lead to the fact that the car will not only twitch at low speeds, but also work unstably in other ranges. To prevent this from happening, it is necessary to choose spark plugs with the required gap and recommended by the manufacturer.
Transmission
The most unpleasant consequence of the effect may be the gearbox. In this case, you will have to remove the gearbox, change the oil in it and add new oil to the level. And also carry out a complete disassembly of it for diagnostics. Thus, the reasons may be failed synchronizers of 1st and 2nd gears, wear of gears or shafts. Another problem can be bearings that are worn out.
Vibration at speed
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It is not always possible to find out the cause of car vibration using computer diagnostics. There are generally accepted recommendations from experienced drivers, mechanics, suspension, steering, and gearbox specialists that help find the causes of vibration at different speeds and with different signs of their manifestation.
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Table 1. Symptoms of malfunction and possible causes of vehicle vibration when driving at various speeds:
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| Speed | Symptoms of malfunction, possible causes |
0 km/h (idle speed)
Vibration of the gearshift lever - misfire, engine tripping. Metallic uniform knocking - damage to the engine mount. High-frequency whistle - wear of the alternator belt.
Uniform slight shaking - unbalance of the flywheel or clutch.
Uneven slight shaking - misfire, malfunction of the fuel supply system, air supply, or engine management system.
0 km/h (high speed)
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Video - if the car shakes during acceleration, then a possible reason could be a grenade:
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Procedure when vibration occurs
Check brake pads and tire pressure
First you need to look at the problem superficially. Sometimes vibration can occur due to a simple hernia on a tire or improper wheel balancing. This point must be checked immediately. Indeed, during the rotation of the wheel, the area with greater gravity will pull the center towards itself, provoking the emergence of centrifugal force.
If the problem is not with the tires or the balancing, it is recommended to check the quality of the components. Often, especially when a car is purchased second-hand, you can find cheap and low-quality components in the brake system that were installed by the previous owner in order to prepare the car for sale at a minimal cost. If you have frankly cheap brake pads and similar elements, it is better to replace them immediately.
The fact is that the material of low-quality brake pads can wear off and remain on the surface of the disc, which slightly changes its thickness, since the distribution is uneven. This also causes vibration when braking. To begin with, you can try removing dirt with a brush. If this does not help, the disc, along with the pads, will have to be replaced.
It is no secret that grinding in brake pads occurs during the first 200 km, during which it is necessary to move measuredly and brake smoothly. If these recommendations are not followed, the friction material on the pads wears unevenly, which can cause vibrations.
If tire pressure is uneven, vibrations can be transmitted to the steering wheel. You need to stop and check the pressure using a pressure gauge.
Check discs for wear and overheating
Overheating/deformation of front brake discs
Despite the fact that the design and execution of modern brake discs allows them to cool quickly enough, during intense braking there is not enough time to remove the heat resulting from friction and the disc overheats.
In this case, blue thermal spots appear on the shiny surface of the disk, and it becomes deformed. Such a defect cannot be corrected and the disk should be replaced immediately. In this case, it is unacceptable to leave the existing brake pads. In this case, they are changed along with the disk.
Owners rarely pay attention to the thickness of brake discs. As a result, the latter become so worn out that they are unable to perform their task. If there are wide edges around the edge, it is recommended to measure the thickness of the disks and compare it with the minimum allowable. It is not uncommon for vibrations to occur due to excessive wear on the disc. If there is a supply, it would not be a bad idea to polish the components by giving them to a professional turner.
In addition, cases of disc deformation are not uncommon on domestic roads. After all, it is enough to drive into a hole at speed once to deform the disc. In addition, it is by no means necessary that the curvature will be noticeable visually - often this is visible only on a special stand. In some cases, the disk can be optimized and aligned, and sometimes it has to be replaced.
