Why does the engine vibrate more after engaging the gear?

What is the working principle of EGR?

EGR is the abbreviation of the three English words Exhaust Gas Recirculation, meaning the exhaust gas recirculation system. It is an exhaust purification device set up for nitrogen oxides (NOx), one of the harmful gases in engine exhaust. When nitrogen oxides are discharged into the atmosphere and come into contact with strong ultraviolet rays, they form photochemical smog. This photochemical smog can cause eye pain and, in severe cases, difficulty breathing. Long-term inhalation of air polluted by nitrogen oxides and black smoke can also easily lead to respiratory diseases and cancer. The engine control computer (ECU) opens the temperature-controlled solenoid valve in a timely manner based on the engine's speed, load (throttle opening), temperature, intake flow, and exhaust flow. The intake pipe vacuum passes through the solenoid valve into the EGR valve vacuum diaphragm chamber, and the diaphragm rod opens the EGR valve. A small portion of the exhaust gas enters the intake system through the EGR valve, mixes with the air-fuel mixture, and then enters the cylinder to participate in combustion.

7

3

Share

What Causes Abnormal Noises When Accelerating a Car?

Engine mount deterioration, engine misfire, and piston slap can cause abnormal noises when accelerating a car. The specific reasons are as follows: Engine Mount Deterioration: Abnormal noise caused by rough engine operation due to deteriorated engine mounts is triggered by excessively early fuel injection timing. Replacing the engine mounts will resolve this issue. Engine Misfire: The abnormal noise follows a certain pattern, accompanied by unstable engine speed and intermittent black smoke emissions. This uneven noise is caused by diesel leakage from the fuel injector. The faulty cylinder component can be identified using the cylinder cut-off method, and replacing the damaged part will solve the problem. Piston Slap: The exhaust pipe produces continuous backfire sounds during exhaust, along with black smoke emissions and overheating. Starting becomes difficult, and the backfire sounds lessen at low speeds. This abnormal noise is caused by excessively delayed fuel injection timing. Replacement of the cylinder liner, piston, and piston rings is required. Automotive Engine Maintenance Methods: Use anti-wear additives for maintenance, employ high-quality engine oil, use qualified coolant, regularly remove carbon deposits from the car, and replace the three filters on time. The three filters refer to the air filter, fuel filter, and oil filter.

11

3

Share

Should the ES use 92 or 95 octane fuel?

According to the official vehicle user manual recommendation, the ES should use 92 octane gasoline. In addition to checking the appropriate gasoline grade in the vehicle user manual, the ES can also check it on the fuel tank cap, which will also be marked. Usually, the fuel grade can also be determined based on the engine's compression ratio. Vehicles with an engine compression ratio between 8.6-9.9 should choose 92 octane gasoline, those with a compression ratio between 10.0-11.5 should choose 95 octane gasoline, and if the compression ratio is higher, 98 octane gasoline should be selected. However, with the use of some new technologies nowadays, the fuel grade cannot be determined solely by the compression ratio. A high compression ratio can also be tuned to use lower octane gasoline. This is because, besides the compression ratio, other factors such as ignition timing, turbocharging technology, and Atkinson cycle technology also play a role. Generally, the higher the gasoline grade, the higher the octane number and the better the anti-knock performance. 92 octane gasoline contains 92% isooctane and 8% n-heptane, while 95 octane gasoline contains 95% isooctane and 5% n-heptane. If the ES occasionally uses the wrong gasoline grade, simply switch back to the correct grade after using it up. However, long-term use of the wrong gasoline grade can have the following effects: For vehicles recommended to use lower octane gasoline, using higher octane gasoline will not cause damage, but the increase in octane number will change the fuel's ignition point, leading to delayed combustion in the engine. This means both the engine's power output and thermal efficiency will decrease, and the actual feedback experience is reduced performance. For vehicles recommended to use higher octane gasoline, using lower octane gasoline can cause engine knocking. Because the octane number is too low, the gasoline's ignition point is reduced, causing it to ignite prematurely during the compression stroke. If the fuel ignites before the spark plug fires during the compression stroke, resistance will occur during the upward stroke. This resistance will make the engine run very unstable. If it's mild knocking, it only increases noise and does not cause significant damage to the engine. However, if there is noticeable knocking, it indicates that the engine's condition is already very severe. The vibration not only affects driving stability but can also cause abnormal wear on the pistons and cylinders, and in severe cases, even cylinder scoring.

12

0

Share

What are the procedures for changing car color?

To apply for changing the color of a motor vehicle, according to Article 6 of the "Road Traffic Safety Law", the following documents need to be submitted: "Application Form for Motor Vehicle Modification Registration". Original and photocopy of the identity certificates of the motor vehicle owner and agent. Original motor vehicle registration certificate. Original motor vehicle driving license. According to Article 6 of Chapter 2 of the "Road Traffic Safety Law", if the color change area of a motor vehicle does not exceed 30%, there is no need to go through the modification registration. Conversely, if it exceeds 30%, it needs to be filed and registered within 10 days after the vehicle color change. Precautions for vehicle color change: Before preparing to change the color of a motor vehicle, it is necessary to consult the vehicle management office where the vehicle is registered to see if the region allows the use of film wrapping to change the vehicle color. If the region does not support this method, the modification filing procedure cannot be processed after the color change, and the film must be completely removed to restore the original color of the vehicle. In addition, according to the "Motor Vehicle Registration Regulations", owners are no longer required to apply to the vehicle management office in advance. They can first change the vehicle color, install body kits, replace the engine, etc., and then apply to the vehicle management office for modification registration. According to Article 10, registered motor vehicles with the following circumstances shall apply for modification registration to the vehicle management office at the place of registration: Change of body color. Replacement of the engine. Replacement of the body or frame. Replacement of the entire vehicle due to quality issues. Change of use nature, such as commercial motor vehicles changed to non-commercial or non-commercial motor vehicles changed to commercial. The motor vehicle owner's residence moves out of or into the jurisdiction area of the vehicle management office. Furthermore, according to Article 15 of the "Road Traffic Safety Law of the People's Republic of China": Police cars, fire trucks, ambulances, and engineering rescue vehicles shall be painted with emblem patterns and equipped with alarms and emblem lights as prescribed. Other motor vehicles shall not be painted with, equipped with, or use the emblem patterns, alarms, or emblem lights exclusively for the aforementioned vehicles or similar ones. Article 56 of the "Motor Vehicle Registration Regulations" states that if the body color is changed without going through the modification registration as required, the public security traffic management department shall issue a warning or impose a fine. The vehicle may also be impounded and required to restore the original body color.

5

4

Share

How to Handle the Deregistration of a Scrapped Vehicle?

First, the owner of the motor vehicle should sell the vehicle to a motor vehicle recycling enterprise before the scrapping deadline. Then, within 7 days after dismantling the motor vehicle, the recycling enterprise must submit the registration certificate and relevant documents to the traffic management department of the public security authority for deregistration.

14

0

Share

Methods for Valve Leakage Without Removing the Cylinder Head

Slowly rotate the crankshaft, carefully observing the movement of the exhaust valve. Pause rotating the crankshaft when the exhaust valve is about to open. Cover the intake pipe opening tightly with your palm. Continue to slowly rotate the crankshaft. When the intake valve is about to open, cover the exhaust pipe opening with your palm. Rotate the crankshaft until the intake valve closes.

2

Share

Why does the engine vibrate more after engaging the gear?

What is the working principle of EGR?

What Causes Abnormal Noises When Accelerating a Car?

Should the ES use 92 or 95 octane fuel?

What are the procedures for changing car color?

How to Handle the Deregistration of a Scrapped Vehicle?

Methods for Valve Leakage Without Removing the Cylinder Head

How to Safely Overtake at Night?

What is the method for checking car engine oil?

What does PRND in automatic transmission mean?

What to Do When Fuel Tank is Full and There's Severe Oil Leakage Under the Car?