[Auto repair knowledge]-Sonata common faults and solutions

Common faults: power drop; unstable idling speed; fuel consumption increase; cold car driving hard; intermittent car crashes. Diagnosis: It may be caused by poor maintenance of the internal engine oil or grease deposits, orThrottle, The oil circuit is not smooth, and some parts of the machine may be damaged in serious cases.Inferior oil products are also one of the root causes of the above-mentioned failures. Due to the uneven domestic oil product conditions, if the oil that does not pass the test is added, it is easy to cause incomplete combustion of the mixed gas in the engine cylinder, resulting in carbon deposits and sticking to it.ValveThe surrounding area affects the sealing performance of the intake valve and exhaust valve, and the compression ratio decreases. As a result, the vehicle power drops and the idle speed is unstable. Solution: According to the requirements of the instruction manual, maintain and clean the relevant parts according to the mileage on time; refuel as far as possible to a reputable gas station;tankAdd some gasoline additives to remove carbon deposits, run for a while to see if there is any improvement; go to the special maintenance station to clean the fuel injector and valve; check the vehicleIgnition moduleWhether it’s damaged or not, if the ignition time is wrong, flashback and engine shaking will occur whenever you accelerate quickly. Common fault: When the manual transmission vehicle is in gear, there is a "click" sound from the top of the gearbox. Diagnosis: Generally, the gear bracket is damaged. Solution: The manual gearbox should not move too violently or too fast when shifting, otherwise the shifting mechanism will be damaged.Especially before putting in reverse gear, wait for the car to come to a complete stop before stepping on it.clutchAttach reverse gear, which will reduce the probability of damage to gears and gear brackets. Common faults: The automatic transmission car makes abnormal noises when shifting gears after wading, and the upshift and downshift are slow. Diagnosis: It is possible that the automatic gearbox has entered water, because there is a vent on the upper part of the automatic gearbox. Once the water enters, the entire gearbox needs to be disassembled and parts replaced, which is expensive for maintenance. Solution: Be extra careful when walking in deeper water. If you are not sure of the depth of the water, you'd better choose another route. Common fault: When the automatic transmission vehicle is parked on a slope, the gear cannot be changed. Diagnosis: It is possible that the P gear locked phenomenon has occurred, and the gear mechanism will be damaged if it is operated with brute force. Since the automatic transmission vehicle is braked by gears when it is parked in the P gear, the gears will get stuck when parking on a slope. Solution: If the P gear is locked, find someone to push the body from the slope to restore the normal amount between the gears to shift out.The correct way to stop on a slope is to first engage the N gear, then tighten the handbrake, and then lift it offbrakeAfter the pedal allows the hand brake to be fully functional, then engage the P gear.