Candles, “donut” and all the others: why vibration appears at idle

Triple

This popular “term” means that one of the cylinders is not working, that is, out of four (the most common number of cylinders on passenger cars), only three are functioning - hence the word. This can be understood by several symptoms:

• the engine starts hesitantly;
• after warming up, the vibration does not disappear;
• the car pulls poorly and jerks;
• increased fuel consumption.

The situation should be corrected as soon as possible. When one cylinder is not working, the load on the others increases sharply. In this case, unburned fuel washes away the lubricant from the walls, thereby wearing out the cylinder bore. There is also a gradual coking of the channels, which sooner or later leads to premature engine overhaul. The main reasons for tripling:

• defect, broken spark plug;
• malfunction of high-voltage wires;
• breakdown of the ignition distributor (distributor), module (on front-wheel drive cars);
• severe wear of one of the elements of the CPG.

It is very easy to check that the cylinders are working properly. To do this, start the engine, put on a rubber glove and remove the high-voltage wires from the spark plugs one by one. If in one of the cases the nature of the engine operation has not changed, then you have found the “culprit” cylinder.

Procedure for installing the gas stop

The sequence of actions is as follows:

1. We open the engine compartment of the Lada Granta and remove the plastic holder in the center of the engine shield, which holds the soundproofing sheet of the engine compartment. Nearby (below) there is another similar internal fastener; several bolts inserted into these holes will hold the lower fastener.
2. We disconnect the plug that holds the plastic engine casing.
3. We screw the mount to the bottom and, having inserted the bolt at 10 on top, tighten the nut from below.
4. We place emphasis on the lower mount.
5. We remove the casing.
6. If there is a hood deflector, we also remove it so that it does not interfere.
7. Place the top bracket directly on the car. It has technological holes into which the upper fastening brackets will be placed. After removing the plugs, we insert the brackets into the slots, screw on the bolts and washers (but do not tighten them).
8. Using a screwdriver, center the hole in the mount with the hole in the hood so that the hole does not move out during the process of tightening the bolts. Once the holes are aligned, you can tighten the mounting bolts.
9. We mount the trim and hood seal in place from below and fix it with plugs to make a smooth hole in it exactly for mounting the Lada Granta holder.
10. We lean the trim against it, mark the outline and cut out a hole with a sharp knife, then tuck everything in carefully and check all the joints. On occasion, you can install a hood deflector.

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Loose engine mount

In this situation, vibration occurs throughout the entire body, since the motor is attached through cushions (they are also called supports), which play the role of not only fasteners, but also dampers that dampen vibrations. There are not many reasons for this problem; pillows can be:

• incorrectly installed;
• worn out;
• damaged during repairs (for example, during installation of the power unit).

Checking the condition of the pillows is easy; you will need an assistant to do this. Open the hood and start the engine. Ask your partner to alternately engage reverse, first and neutral gears. At these moments, look at the engine: with each switch it should deviate slightly, and at the same angle. If the slope is significantly greater or less in one direction, the problem is a bad pillow. It should be replaced.

It is recommended to install a set: a car with front-wheel drive usually has 3 airbags, with a rear-wheel drive (“classic”) – 2.

The wheel alignment is broken

Directly depending on the incorrectly set angle, vibration can only occur during acceleration or in a certain speed range. Incorrect wheel alignment can be detected very quickly - tires wear unevenly.

If only the outer or only the inner part is wiped, then this is the same situation. The problem can be corrected by adjusting the angles. Then the vibration in the body at a speed of 100-120 km/h will disappear.

But the camber/toe has been adjusted, but the problem has not gone away. The angle has been corrected, that's a fact. But the car owner decided not to change the tires, because they can still drive. But the tires “drive” the way they are used to. This means that you need to change the tires or drive at low speeds for a period of time, then the tread will wear out evenly and the problem will be solved.

Disorders in the nutrition system

Ultimately, they come down to improper formation of the composition of the combustible mixture. Typically, vibration at idle is a consequence of its depletion. It is possible to understand exactly which node or element is the source of the problem only with the help of special equipment. There are many reasons, below are just a few of them:

• fuel pump failure;
• contamination of the filter and (or) fuel line;

• clogged jets in the carburetor or nozzles in the ramp;
• incorrect carburetor settings, faulty sensors in the injection engine, etc.

Lada Kalina Sedan K-Line › Logbook › Gas stops on the hood. Part 3 (of 3). Completion

The gas struts are installed and are working properly. In previous posts about gas struts, many people noticed the rusty corners. I should paint it

Now it's time to paint)

1. Remove the stops from the car along with the mount.

2. We clean our corners using a drill and iron attachments. To clean the corner from the outside, simply secure it in a vice, but in order to clean the corner from the inside, I screwed in a bolt with a nut, which was safely and firmly clamped in the vice

3. For comparison, I laid out the corner before and after cleaning. The result is very impressive

4. After cleaning, two corners are ready for painting)

5. I decided to remake the upper corners from 3 mm metal, because... The old ones bent well.

6. Here, for comparison, are old ones made of 2 mm metal and new ones, just prepared, made of 3 mm metal.

7. The corners are cleaned and ready for painting.

8. Degrease with solvent 646 and apply primer in one layer.

9 Wait until it dries and apply a few more layers

10. For quick drying, I used an electric heater.

11. Priming was successful. Now let's paint.

12. Apply several layers of paint with preliminary drying.

13. The paint has dried. Now you can varnish it. So that everything is according to Feng Shui)

14. Varnished in one layer. It will do) Leave the parts to dry overnight...

15. Everything has dried up. Let's move on to installing devices. Self-locking nuts for M8 were purchased earlier. Nice stuff...

16. Looks beautiful now!

18. The supports are in their rightful place! Corners according to Feng Shui: both beautiful and the metal is protected)

Conclusion: 1. Corners are protected from atmospheric influences2. Looks nice like a factory part3. It would have been possible to paint everything with a brush (it would have been easier, and less paint would have been used), but since you have a spray gun, it’s useful4. The upper newly made corners did not fit (the hood sticks out a lot), I had to leave the old corners made of 2 mm metal

Brakes

For some this sounds strange, however, the braking system has its own connection with the engine. We are talking about a vacuum booster. It is connected to the intake manifold through a special hose. This is necessary in order to create a vacuum inside the amplifier. The vacuum is formed due to the “suction” of air from this unit by the engine pistons. If the tightness of the connecting hose is broken, excess air begins to enter the cylinders, depleting the combustible mixture. Verification steps:

1. When the power unit is not working, slowly press the brake several times (3-4) and hold the pedal, which should be elastic.
2. Start the engine: the pedal should gradually fall down. If this is not the case, air leaks occur.
3. To check the hose, it must be removed. Test by blowing. If the tube is leaking air, it will need to be replaced, and if it is intact, check the fitting screwed into the amplifier. Take a medical bulb and put it on the fitting. When you press on it, the air should flow only in one direction (there is no reverse “move”). Or you can simply blow: first into the wide part of the fitting, then into the narrow one. If air passes in both directions, you will have to buy a new spare part.

Procedure for installing the gas stop

The sequence of actions is as follows:

1. We open the engine compartment of the Lada Granta and remove the plastic holder in the center of the engine shield, which holds the soundproofing sheet of the engine compartment. Nearby (below) there is another similar internal fastener; several bolts inserted into these holes will hold the lower fastener.
2. We disconnect the plug that holds the plastic engine casing.
3. We screw the mount to the bottom and, having inserted the bolt at 10 on top, tighten the nut from below.
4. We place emphasis on the lower mount.
5. We remove the casing.
6. If there is a hood deflector, we also remove it so that it does not interfere.
7. Place the top bracket directly on the car. It has technological holes into which the upper fastening brackets will be placed. After removing the plugs, we insert the brackets into the slots, screw on the bolts and washers (but do not tighten them).
8. Using a screwdriver, center the hole in the mount with the hole in the hood so that the hole does not move out during the process of tightening the bolts. Once the holes are aligned, you can tighten the mounting bolts.
9. We mount the trim and hood seal in place from below and fix it with plugs to make a smooth hole in it exactly for mounting the Lada Granta holder.
10. We lean the trim against it, mark the outline and cut out a hole with a sharp knife, then tuck everything in carefully and check all the joints. On occasion, you can install a hood deflector.

The gas hood stop on the Lada is installed by true connoisseurs of high-quality tuning. It provides a spectacular, effortless opening of the hood. The stop ensures safety when working in the engine compartment of a car.

Sensor malfunctions

This is also one of the reasons that causes engine vibration at idle speed. Mass air flow sensor, lambda probe, idle air control, TPS - failure of these spare parts has a negative impact on the stable operation of the engine. As a result, the control unit receives incorrect information and forms the wrong composition of the combustible mixture. If the DPKV, knock or phase sensor stops functioning, the same picture results: vibration. You can find the faulty part using the on-board computer or controller using the error code.

Reviews of companies

• Vladislav: a year ago I installed pushers on Granta at the Alta-Carter service station. The craftsmen did everything quickly and efficiently. My recommendations to Grantmakers.
• Ignat: after purchasing Grants, I replaced the torsion bars on the trunk with gas pushers. I ordered the service from the service station "EVAS-AUTO MSK". They work professionally, they have specialized equipment, they are experts at everything “100”.
• Sergey: my garage comrades recommended installing a gas pusher on the hood. I bought it at the Mnogofactors parts store. Good quality, reasonable prices.
• Gennady: I ​​drove for a year on standard trunk lid torsion bars and decided to switch to oil pushers. I bought it from World of Roads. Six months have passed since installation, no complaints, my recommendations.
• Kirill: I’m leaving my positive review about the auto parts store Prosport Performance OJSC. Professional advice, reasonable prices, bonus discounts.

Diesel vibration at idle

At first glance, everything is simpler here: there are no spark plugs, no distributors. However, the “shaking” of a car equipped with a diesel engine indicates more serious and “costly” problems:

1. Failure of the injection pump, which can only be checked using special equipment.
2. Injector contamination. Their cleaning is carried out in specialized technical centers.

If vibration occurs at idle, checking the diesel unit should begin by determining the compression in the cylinders. If it does not meet the standard, the mixture will not ignite and the engine will begin to shake. The second stage of testing is to check the alignment of the marks on the power unit cover and the camshaft pulley. If the injection angle is incorrect, the diesel engine will operate unstably.

Unlike imbalance during acceleration, engine vibration at idle speed cannot be caused by the driveshaft, driveshafts, wheels and many other transmission components. Since the internal combustion engine is idling and the gearbox is in neutral, the list of reasons due to which vibration is transmitted to the body and interior is significantly reduced.

Purpose of the hood shock absorber for LADA Granta FL

This hood stop is intended for the “new” Granta, that is, for a car after a facelift that occurred in 2022. The product itself is intended to replace the standard hood strut.

Having installed it, you will be very comfortable opening and closing the hood, keeping both your hands and clothes clean, especially in spring and autumn, in the off-season. It is enough to slightly lift the hood with one hand, and then the gas stop will lift it, lock it and hold it in the open position. A high-quality factory product will serve for a long time in any weather conditions, and it does not require special maintenance or additional modifications.

Possible reasons

• Uneven compression in the cylinders. Due to a decrease in compression, efficient combustion of the air-fuel mixture does not occur, as a result of which the piston in the problem cylinder does not receive proper acceleration. The reason for vibration at idle speed in this case is a decrease in the inertial movement of the piston during the power stroke.
• Misfire in 1 or several cylinders at once. As in the case of loss of compression, due to poor combustion of the fuel injection pump, the piston does not receive proper acceleration, which leads to uneven rotation of the crankshaft.
• Dual-mass flywheel malfunction. When in good condition, the torsional vibration damper can reduce the load on the crankshaft and transmission elements. In case of failure, engine vibrations are observed, accompanied by a characteristic rumble.
• Wear of engine mounts. The engine in the engine compartment is supported by several silent blocks. In case of cracks or tears in the rubber dampers, vibrations will be transmitted to the body and clearly felt in the cabin.
• Wear of the drive of the balance shafts and the balancers themselves. Bearing wear, chain stretching, and incorrect tensioner adjustment lead to increased noise and vibration.

Engine support cushions

How to determine that the cause of the imbalance is in the pillows?

• Visually inspect the engine mounting silent blocks. The rubber damper should not peel off from metal elements or have deep cracks.
• Using a rolling jack and a small rubber spacer, jack up the engine one at a time on all sides of the mounting of the cushions (the fulcrum should be as close as possible to the location of the damper). After each change in the position of the fulcrum, observe the operation of the motor. The vibration should noticeably decrease when the engine is jacked up near the torn mount.

We recommend replacing engine mounts only using original spare parts or worthy analogues. When buying cheap pillows from unverified manufacturers, you risk running into damping inserts that are too hard. As a result, after replacement, the vibration not only will not disappear, but may even intensify.

Compression

Vibration associated with loss of compression will first manifest itself when it is cold. As the metal parts warm up, they expand, thereby reducing the gaps through which exhaust gases escape. Uneven compression in the cylinders is a natural phenomenon for an engine with a mileage of more than 100 thousand/km. But for normal operation, the spread should not exceed 0.5-1 kgf/cm2. At higher values, vibrations may already be observed when cold.

Compression should be checked on a cold engine. You can find out what compression should be in the engine from the repair and operation manual for your car. Following the check, you can determine what exactly caused the loss of compression: a problem with the CPG or timing parts. To do this, pour 25-30 mg of engine oil into the problem cylinder, then repeat the measurements. If the compression levels out, the reason is the wear of the CPG. The absence of changes indicates problems with the timing belt. A more accurate diagnosis of the cause of vibrations at idle can be done with a pneumatic tester.

Misfires

Self-diagnosis of modern engine ECUs allows you to determine the cylinder number, which greatly facilitates the search for the cause of vibrations at idle. Multiple misfires indicate intermittent problems in several cylinders at once. It does not at all follow from the term that the cause of interruptions in operation is in the ignition system, since the ECU determines misfires by uneven rotation of the crankshaft. What elements most often cause misfires and increased vibration?

• Fuel injectors (TPVS over-rich or too lean).
• Spark plug. Interruptions in the spark supply are caused by oil deposits on the spark plugs, erosion of the electrodes, damage to the ceramic insulation, and improper air gap.
• High voltage wires.
• Ignition coil/ignition modules.
• The engine control unit.

Do not forget about the problem of air leaks and many other reasons due to which the engine rattles and vibration is transmitted to the body. In any case, we recommend proceeding with troubleshooting only after reading the error codes.

Recommendations for choosing parts for installation

The cost of products from a domestic manufacturer is 10–15% lower than their foreign counterparts. The quality of parts made by different manufacturers does not differ much. It is not rational to overpay interest for a trademark.

Another thing is the type of pusher. As mentioned above, shock absorbers are made with oil and gas filler. Obviously, gas models are more durable, more reliable, but are 15% more expensive than their oil counterparts. The final choice is up to the owner of the technical device.

Dual mass flywheel

Symptoms of damping flywheel failure:

• creaking, grinding noise when starting and stopping the power unit;
• rumbling sound when the engine is idling;
• vibration transmitted to the body and interior (with non-critical wear only in cold weather).

The reason for this behavior is the backlash of the elements of the spring-damper system, which is designed to dampen torsional vibrations. On cars with manual transmission, to check the flywheel, just squeeze the clutch. If the engine begins to run smoother and vibrations have decreased, it means that the reason for unstable idling is the dual-mass flywheel. The owner of a car with a robotic gearbox is left to rely on indirect signs and defects after disassembly.

How to make a cheap gas hood stop for Lada Granta and Kalina with your own hands

In the standard version, the hood of the Kalina and Grants is held in the open position by a stop (popularly called a “poker”). If you often have to look into the engine compartment, the design can be modified by purchasing a special hood shock absorber, the price of which starts from 1,200 rubles. Want to save money? Install the hood gas stop yourself for only 100-200 rubles.

It's no secret that most of Grant's technical solutions migrated to Kalina. The hood of these two models is the same, so installing the hood damper is no different.

1. Gas stop from Chery with a force of 300 N (catalog number: S21-5605010) - 1 piece;
2. Furniture corner dimensions 60x30x20mm;
3. Bolt M8*16 - 1 pc.;
4. Nut M8 - 1 pc.;
5. Enlarged washer M8 - 1 pc.;
6. M8 washer - 2 pcs.;
7. Connecting nut (barrel) M8*20 - 1 piece;
8. Ball gas stop holder 21080-6308134-00 - 2 pcs.

1. Install an M8 bolt with a nut, a barrel and a ball stop holder into the technological hole near the left headlight;
2. Unscrew the hood fastening bolt and install the hood support bracket, having previously made a hole in it for the ball holder;
3. Insert the hood gas stop into the ball holders.

The most difficult part of this modification is finding the hood gas strut bracket. There are two ways to do this:

1. Make it, for example, from a furniture corner measuring 60x40x40mm, cutting off one edge;
2. Use a 20x20mm corner and cut off part of the metal in the engine compartment on which the seal is installed. Otherwise, the corner will rest against it.

As a result, the force of one shock absorber (300 N) will be enough to hold the hood open. The procedure for installing the gas stop is also shown in the video:

Let us remind you that you can “kill two birds with one stone.” To do this, we install a front strut strut, which has the ability to install a gas stop. By the way, an additional hood seal will help keep the engine compartment clean (installation for Granta, for Kalina 2).

Diesel cycle internal combustion engine

Vibration transmitted to the body is one of the features of the operation of a diesel engine, which is determined by the nature of ignition and combustion of diesel fuel. But it is important to distinguish the normal level of vibration from obvious symptoms of a malfunction.

We recommend that you start checking the fuel system with computer diagnostics, or more precisely, with real-time reading of injection correction. A positive correction will indicate an overflow of fuel, respectively, a negative correction will indicate a decrease in the injection time by the computer. This indicator does not mean that the injector is faulty. But it perfectly shows how, by adjusting the amount of fuel injected, the ECU tries to maintain stable engine operation at idle.

The cause of increased vibrations may well be the high-pressure fuel pump itself. If vibration is transmitted to the body only in the first minutes after a cold start, most likely the cause is a faulty glow plug. Also, do not rule out problems with loss of compression.

Imbalance after repair

If vibration at idle appears after a major engine overhaul, the reason may be due to negligence in the selection of parts. Negative factors include:

• installation of pistons, connecting rods, which differ significantly in weight;
• discrepancy between the gaps in the cylinder-piston group, as a result of which the relocation of the pistons occurs with an impact;
• unbalanced crankshaft;
• critical wear of seats, poor lapping of valve chamfers, incorrect adjustment of thermal clearance. These factors can cause loss of compression and vibration.

On cars with a manual transmission, vibrations at idle and medium speeds appear after installing a low-quality clutch kit. The imbalance transmitted to the body will increase if, after repeated overheating, the flywheel has not been machined and balanced. If the flywheel is excessively lightened and the inertial mass is reduced, smoothing out the uneven rotation of the crankshaft, the engine will operate unstably at idle speed.

Many engines begin to vibrate at idle after removing the balancer shafts. Owners get rid of the balance shaft mechanism so as not to spend money on their repair. Removing balancers not only provokes vibrations, but also increases the load on the crankshaft, which reduces its service life.

Running an internal combustion engine with the clutch disengaged or in neutral is called idling. In this case, the torque of the power unit is not transmitted to the vehicle’s transmission and further to the wheels. Over time, increased engine vibration at idle and low speeds may become noticeable. Depending on the type of internal combustion engine, the number of idle speeds at which it operates stably is 850 rpm. Reducing the idle speed leads to unstable engine operation, including the possibility of spontaneous stopping.

New Grant hood gas stop: rules for selection and installation

When choosing a suitable accessory, you need to study its characteristics. For example, high-quality gas struts for the trunk of a Lada Granta with a chrome-plated steel rod will last a long time and reliably. In addition, gas saturation will guarantee good operation even in severe frosts. This model is suitable for work in any weather.

Differences in length and strength are also important when searching for suitable options. Before you buy a Grant hood gas stop, you need to make sure that the dimensions of the accessory match exactly.

The load on the product should not be too heavy. Therefore, it can be installed on the hood or trunk. It is not recommended to make sudden jerks when opening; careless handling can damage the stop.

Products may differ both in parameters and operating pressure. The diameter of the rod and cylinder are the values ​​of their dimensions, which only relatively affect the quality of work. It is recommended to purchase a hood stop for Grant with a pressure within 400 H and a total length of 50 cm. These dimensions are quite enough for normal functioning.

After purchasing a suitable stop, you can install it yourself. This will require mounting brackets. One of them is screwed to the hood, the second to the body. Next, the gas stop of the hood of the Lada Grant is attached to the prepared fasteners and the quality of the work done is checked.

When installing for a trunk, the procedure does not change. But the motorist needs to take into account the difference in the length of the products.

The longer the Grant trunk gas stop, the wider the opening angle. This rule also applies to the installation of the front hood support. It’s worth thinking about all the nuances in advance and taking the necessary measurements.

Correct installation of the product will guarantee its good service for many years. Some car owners are considering installing not one, but several elements. But one high-quality gas strut for the Grant trunk will completely cope with the assigned tasks. Therefore, there is no need to reinvent the wheel: it is better to concentrate on purchasing and installing a reliable element.

Why do engine vibrations occur at idle?

Under normal engine operating conditions, there are no vibrations in idle mode. In this mode, torque is not transmitted through the gearbox to the driveshaft, so it must operate steadily and not create unnecessary vibrations. If the internal combustion engine has strong vibration at idle or low speed, make sure that the cause is the engine.

To do this, simply depress the clutch pedal (to disconnect the engine from the gearbox). If the shaking remains when the clutch is disengaged, this means that the problem is in the engine, if not, then the result of the jerking is problems in the clutch or gearbox.

During normal operation of the internal combustion engine, imbalances are allowed, which do not greatly affect the comfort of driving the vehicle. During the winter season, the engine may vibrate more when starting. However, when warming up (after 5-10 minutes), the level of shaking returns to normal. In this case, there should be no jerks, dips or extraneous sounds when the motor is running. If the nature of the twitching in idle speed mode has changed, this indicates certain malfunctions in the internal combustion engine.

Increased vibrations arising from engine operation negatively affect both the condition of the internal combustion engine and the technical serviceability of other parts and elements of the vehicle. Therefore, it is necessary to quickly diagnose the source of vibration and eliminate it.

Auto mechanics identify the following main factors due to which engine vibrations increase in idle mode:

1. Wear of the power unit supports.

2. Crankshaft imbalance, incl. after repair.

3. Engine tripping.

Reason No. 1 - Malfunction of engine support pads

These car parts perform two functions:

1. The power plant is attached to the body (frame) of the vehicle;
2. Its vibrations are dampened.

The supports are made of special rubber, which wears out during use. Therefore, when cracks, tears, etc. appear. they cease to eliminate vibrations that are transmitted to the body and are clearly felt in the cabin. If only one damper is damaged, then the others are more likely to be worn out, but this has not yet become apparent. In this regard, all supports must be inspected and replaced.

Let's consider how to determine that the source of increased vibrations is a malfunction of the engine mounts.

1. Conduct a visual inspection of the motor silent blocks. They should not have large cracks, tears or peel off from metal parts.
2. Having installed a rolling jack with a rubber spacer, lift the engine one by one on each side where the cushion is located (the lifting location should be as close as possible to the power unit support). Observe engine operation after each change of jack location. When lifting the engine from the side of the faulty mount, the strength of vibrations transmitted to the car body will decrease.
3. In addition, diagnostics can be carried out without using a jack. This requires one more person. We open the hood and rock the car, sharply changing the direction of movement. In this case, the assistant should look at the angle of roll of the engine in different directions. If the cushions are in good condition, the power plant will swing in all directions evenly and equally. The motor will tilt more towards the faulty support, which needs to be replaced.

Review of Manufacturer Prices

*prices are current as of October 20, 2018.

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