Q: The engine compartment of the Mondeo Win is dirty. Can it be cleaned with a high-pressure water gun?
A: It is absolutely not advisable to use a high-pressure water gun to flush the engine compartment. Today’s cars are equipped with an electronically controlled fuel injection system, and the engine compartment is equipped with an engine computer, a gearbox computer, an ignition computer, and various sensors and actuators. These electronic components are all controlled by voltage. After coming into contact with water, there may be a short circuit, which is likely to damage the engine computer. Generally speaking, the price of an engine computer is several thousand yuan, and the price of a sensor is also around 1,000 yuan. These accessories can be said to be very expensive. For the dust in the engine compartment, it is recommended that you go to a repair shop or tire shop to clean it with a high-pressure air gun, or use a wet towel without water to clean it up.
Q: Why does Dongfeng Peugeot 307 antifreeze leak into the cab?
A: According to the phenomenon you described, there should be leakage in the warm air small water tank or water pipe joint. Peugeot 307 warm air small water tank is located in the cab. The specific position of the small water tank is close to the side of the driver’s right leg. The leakage part is generally the water pipe joint. Poor sealing of the water pipe joint will lead to antifreeze leakage. The possibility of leakage of the small water tank is very small. In this case, it is recommended that the vehicle go to the 4S shop for maintenance immediately. It can be solved by replacing it with new accessories.
Q: Is there no need to replace the environmental protection logo after the annual vehicle inspection?
A: The current environmental protection logo does not need to be replaced. The environmental protection logo received by the owner is accompanied by an electronic chip, which stores the relevant information of the vehicle. When the vehicle is inspected again, the information stored in the electronic chip will be used as the basis for testing. After the inspection, there is no need to replace the environmental protection logo card. Just refresh the chip and get a simple piece of paper.
Q: Is the Honda Fit automatic in D or N gear when waiting for the red light?
A: When driving a vehicle equipped with an automatic transmission while waiting for a signal light or stuck in traffic, some drivers often keep the shift lever in gear D and press the brake pedal at the same time. If the time is very short, this is allowed. But if you stop for a long time, it is best to change into gear N or P and tighten the parking brake. Because when the shift lever is in gear D, the automatic transmission car will move forward slightly. If you step on the brake pedal for a long time, it is equivalent to forcibly stopping this advance, which will increase the transmission oil temperature and make the oil easy to deteriorate.
Q: Every time Yida starts, there will be abnormal noises when changing second gear. What’s going on?
A: Expert: When the vehicle is started at a speed of about 20 kilometers per hour, the ABS pump will make a self-test sound, and this phenomenon also exists in other brands of models. This sound will only appear after the engine is restarted, which is a normal phenomenon and does not require a 4S shop for maintenance.
Q: What should I do if the Audi A8L chassis cannot be lifted normally?
A: First check whether the air pump of the chassis lifting system is running normally, then check whether the relevant pipelines connected to the air pump are leaking, and whether the control unit of the lifting system is faulty. Start the engine to operate the chassis lifting and lowering should be able to hear the sound of the air pump working below. In addition, the failure of the chassis lifting height sensor will also cause it to not work properly.
Q: In the 2005 Nissan Teana 350, why do you always hear similar noise while driving?
A: The Nissan Teana 350 is equipped with a CVT continuously variable transmission. This abnormal sound is commonly referred to as "barking". The reason is the matching of the high compression ratio of this model and the best speed ratio of the CVT continuously variable transmission. At present, there are two main reasons for this failure:
1) Fuel combustion quality. According to the requirements of environmental protection design standards and the compression ratio of models, models with Euro III or Euro IV emission standards should use Euro III or Euro IV fuel. If the gasoline octane number does not meet the standard, it will cause excessive emissions, which will be detected by the control system, causing the engine failure light to light up, or premature ignition knock due to high compression ratio.
2) Internal colloids and carbon deposits. During the storage and transportation of fuel, oxidation reactions are prone to occur, resulting in colloidal substances. These colloidal substances are divided into soluble colloids and insoluble colloids according to the solubility of gasoline. Insoluble colloids are also called deposits. After they are added to the car fuel tank together with fuel, they will adhere to the fuel filter, clog the filter medium, reduce the amount of fuel supply, insufficient oil transportation, and poor fuel atomization, resulting in thinning of the combustible mixture, and a decrease in engine power and economy.
After the soluble colloid enters the combustion chamber and burns together with the gasoline, many hard carbon deposits will be formed in the intake valve, the top of the piston, the piston ring groove, the combustion chamber, the spark plug and other parts, resulting in lax valve closure and engine performance degradation, such as unsmooth acceleration, unstable idle speed, stall, jitter, knock and a series of failures. Also affected by maintenance and the environment, during crankcase ventilation work, many impurities enter the intake pipe and burn, which also produces partial carbon deposits, which will lead to knock (called rod) phenomenon.
Maintenance plan:
1) Conduct internal cleaning according to vehicle conditions to remove carbon deposits formed inside the engine, and regularly clean or replace the air filter.
2) It is recommended to add No. 97 unleaded gasoline to the vehicle and slowly add the accelerator during use.
Q: The old Bora has high fuel consumption recently. After inspection, it was learned that the spark plug gap is too large. Can you adjust the spark plug gap and continue to use it?
A: The working condition of the spark plug has a lot to do with fuel consumption. The function of the spark plug is to generate an electric spark when the high voltage electricity skips the gap between the electrodes and ignites the mixture in the cylinder. At present, the gap of the spark plug of the EFI engine is mostly between 1.0~ 1.2mm (specific to the gap of each model, you need to refer to the maintenance manual). If the gap of the spark plug is too large, it will cause the jump voltage to be higher, so that the ignition coil will heat up beyond the load, or even burn out, and there will be a phenomenon of fire failure at high speed; if the gap is too small, the spark time will be shortened, resulting in a reduction in the ignition energy and it is not easy to ignite the mixture. Therefore, be sure to ensure a normal spark plug gap.
Volkswagen Bora model spark plugs are replaced every 30,000 kilometers, and must be replaced after driving to the specified mileage, and cannot be adjusted for continued use.
Q: The fuel consumption information of the new Jingcheng driving computer shows 8.8 liters, but the actual fuel consumption is about 11 liters. Why is that?
A: Today’s cars are equipped with a large number of electronic information devices, which is indeed helpful to drivers. For example, outside the car temperature information, instantaneous fuel consumption, fuel consumption of 100 kilometers, oil level information, etc., but these information manufacturers call reference information. The 8.8 liters of fuel consumption you see is not the most accurate fuel consumption, and can only be used as a reference. For the new automatic transmission range, it is normal for the 1.8L displacement engine to consume between 10 and 11 liters under comprehensive road conditions. It is difficult to control the fuel consumption within 10 liters when driving in urban areas.
Q: The Maiteng engine failure light is on, and No. 93 unleaded gasoline has been added to Sinopec Group. What should I do now?
A: Expert of Wanche Network: The lighting of the Maiteng engine fault light indicates that the exhaust emissions exceed the standard, or the engine working condition is abnormal. The lighting of the fault light has a lot to do with the oil. Adding low-grade gasoline or inferior oil will cause the engine failure light to light up. Maiteng 1.8T engine needs to add No. 97 unleaded gasoline. You can try to replace the high-grade oil first. If the fault light will still light up after replacing No. 97 gasoline, focus on checking whether the oxygen sensor signal is normal. Poor or damaged oxygen sensor will cause the fault light to light up. Then there is carbon deposition inside the engine. Too much carbon deposition will also cause the fault light to light up.
Q: The new Elysee engine fault light is on, and the accelerator pedal loses its function, and there is obvious shaking in the idling speed. The failure will still occur after cleaning the throttle body. What’s going on?
A: The Elysee engine fault light is on, and the accelerator pedal loses its function. It may be caused by poor contact of the electronic throttle body connector, which has nothing to do with the carbon deposition of the electronic throttle body. This fault phenomenon requires the replacement of the electronic throttle connector. There are many phenomena in which the faulty light is lit due to poor contact of the throttle body connector of the Elysee car. Secondly, check the accelerator pedal position sensor. Damage or abnormality of the pedal position sensor can also lead to such faults. The loss of the accelerator pedal will affect driving safety. Such faults need to be repaired in time. (For more related problems, please contact "Quality Car Expert". Wanche Network www.webcars.com.cn)