What are the common faults of diesel engines?

1 Answers
SanLilliana
07/24/25 5:59pm
Common faults of diesel engines include: 1. Difficulty in starting: mainly includes starting faults such as difficulty in starting the diesel engine at normal temperature and cold starting difficulties; 2. Unstable idle speed: mainly refers to faults in idle conditions such as unstable idle speed, no idle speed, and idle speed fluctuation; 3. Unstable operation under medium and small load conditions: the engine is prone to stalling, individual cylinders work intermittently, and power output is unstable; 4. Insufficient power under heavy load: the diesel engine performs weakly under high-speed and high-load conditions, and the car has insufficient power such as weak acceleration; 5. High fuel consumption: faults such as high fuel consumption found during car use, and a significant increase in fuel consumption per 100 kilometers found during long-distance trips; 6. Engine does not shut off after fuel cutoff: the engine continues to run without shutting off after turning off, and still does not shut off after repeated attempts to turn it off.
Was this review help?
12
3
Share
More Forum Discussions

Why Can't I See the Lines on the Ground When Reversing into a Parking Space?

Adjust the rearview mirror so that the front door handle is positioned at the center of the mirror to see the lines. Below is an introduction to reversing into a parking space: 1. Overview: Reversing into a parking space has been a mandatory test item for obtaining a small car driver's license since 2013. It assesses the driver's ability to maneuver the vehicle in a confined space. Reversing into a parking space is a key evaluation point in the driver's test, requiring the driver to correctly reverse the vehicle into the garage from both sides while in motion. There is a time limit for this maneuver during the test. 2. Methods: There are three most common types of reversing: The first is the "non"-shaped reversing into a parking space, commonly seen in large shopping malls. The second is the roadside "one"-shaped reversing into a parking space, also known as parallel parking. The third is the less common diagonal reversing into a parking space. About 70% of driving students find parallel parking more challenging.
18
4
Share

Where is the headlight height adjustment switch for the Avalon?

The headlight height adjustment switch for the Avalon is located in the headlight control area on the left side of the steering wheel. Below is an introduction to the 2021 Avalon model: 1. Dimensions: The vehicle's length, width, and height are 4975*1850*1450mm, with a wheelbase of 2870mm. 2. Exterior: The new car continues the family design language, featuring a large front grille filled with a black piano lacquer mesh, complemented by exquisite chrome trim. The narrow and elongated headlights on both sides have a sharp and stylish design, with a three-point internal layout that provides excellent visual effects when illuminated. 3. Powertrain: It offers a 2.0L engine, a 2.5L engine, and a 2.5L hybrid for users to choose from, with maximum power outputs of 131 kW, 154 kW, and 160 kW respectively. The 2.0L engine is paired with a CVT transmission, the 2.5L engine is matched with an 8-speed automatic transmission, and the hybrid model comes with an E-CVT electronic continuously variable transmission.
15
1
Share

What Causes Intermittent Idle Vibration in the Volkswagen Lavida?

Below are the reasons for intermittent idle vibration in the Volkswagen Lavida: 1. Intake manifold leakage: When unauthorized air, fuel vapor, or combustion exhaust enters the intake manifold, it causes the air-fuel mixture to become too rich or too lean, leading to unstable idle. 2. Excessive carbon buildup in the throttle body: Too much carbon buildup in the throttle body and surrounding intake passages alters the cross-sectional area of the air passage, preventing the control unit from precisely regulating idle air intake. This also results in an overly rich or lean mixture, causing unstable idle. 3. Faulty intake system actuators: The engine's intake system has numerous actuators, such as the throttle motor, idle stepper motor, duty cycle solenoid valve, mass airflow sensor, and intake pressure sensor. Damage to any of these components can cause unstable idle. 4. Fuel system issues: Problems like clogged fuel injectors, blocked fuel filters, obstructed fuel pump screens, faulty fuel pressure regulators, or clogged return fuel lines can lead to incorrect fuel injection, resulting in an overly rich or lean mixture and unstable idle. 5. Ignition system faults: Issues such as faulty ignition modules, incorrect spark plug gaps, eroded or damaged spark plug electrodes, or excessive resistance in high-voltage wires can reduce spark energy or cause misfires, leading to erratic idle speeds.
16
2
Share

Why does the car still move when in N gear?

The car still moves when in N gear because the brake is not pressed or the handbrake is not engaged. The N gear is one of the three standard gears in automatic transmission vehicles, located between the R gear and D gear on the gear shift console. Its essence is the neutral gear in the transmission, designed to cut off the power transmission between the input shaft and the output shaft inside the transmission. Therefore, when parking in N gear, it is essential to engage the handbrake. Below is an introduction to the gears of an automatic transmission car: 1. L gear: Low gear, which limits speed. When going uphill, shifting to this gear maintains a state of high RPM and low gear. 2. S gear: Sport mode, where the transmission can shift freely, but the shifting timing is delayed, keeping the engine at high RPM for a longer time, allowing the car to move at low gear and high RPM for an extended period. 3. D gear: Drive gear, used when the car is moving forward. 4. N gear: Neutral gear, used during brief stops. 5. P gear: Parking gear, used when parking; placing the gear in P gear stops the car's braking system, preventing rolling. 6. R gear: Reverse gear, used when reversing. However, the R gear can only be engaged when the vehicle is completely stopped. Engaging the R gear while the vehicle is moving slowly can cause severe damage to the car's transmission.
11
1
Share

What Are the Effects of Charging a Phone Without Starting the Car?

Charging a phone without starting the car once or twice may not have any significant impact on the vehicle. However, frequent and prolonged charging sessions can severely deplete the car's battery and cause substantial damage to it. It is recommended to start the vehicle while charging the phone. Charging the phone without starting the car means the power is drawn from the car's battery rather than the alternator. Generally, a car battery operates at around 12V, while phone charging requires approximately 5V. Thus, charging a phone for two to three hours can drain the car battery completely. Moreover, excessive discharge leading to battery depletion often incurs higher costs than replacing a new battery. Not just phone charging, other electrical devices should also be avoided for prolonged use when the engine is off, such as air conditioning, multimedia systems, headlights, and other external electrical equipment. Try to prevent the battery from overworking. A depleted battery not only causes trouble like failure to start the engine but also leads to severe battery damage. Methods to Extend Battery Life: Periodically clean the battery terminals and apply specialized grease to protect the wiring harness. Also, regularly inspect the battery components and connecting circuits. Avoid using in-car electrical devices after turning off the engine. Using the battery alone when the engine is not generating power can easily lead to battery depletion.
8
0
Share

What is the reason why the Volkswagen Lavida sometimes starts and sometimes doesn't when igniting?

The reasons why the Volkswagen Lavida sometimes starts and sometimes doesn't when igniting are as follows: 1. The battery is rusty or leaking. 2. The engine's spark plug is damp. Below is more information about the Volkswagen Lavida: 1. In terms of power: The Lavida uses a 1.6-liter engine derived from the Polo and a 2.0-liter naturally aspirated engine from Volkswagen's new engine platform. 2. In terms of configuration: The car adopts a three-spoke sports steering wheel, and high-end models are equipped with side airbags, a sunroof, perforated leather seats, a reverse radar, a Bluetooth system, and a luxury audio system with MP3 function.
15
1
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.