Changsha Huaxing auto repair shop specializing in vehicle maintenance, vehicle rescue service 24 hours, sheet metal painting, maintenance, car air conditioning deodorant, car smell processing, paint plating crystal, polishing, waxing, insurance claims, vehicle service agents, car painting, car beauty, paint care and other services. Changsha Huaxing car repair shop Mr. Cheng: 13908462346 Tang:? 13707480626 Website: http: //www.huaxingqx.com/ Address:? Furong District lofty Road Ma Poling (Mapo Road Primary School opposite) Changsha Auto where the most professional car maintenance repair cases - Changan MX vain car how to handle the car is dragged, the phenomenon is vain car, I come before the other master has to do a simple test. I asked the owner, the owner of the vehicle suddenly refueling reflect no response, then slowly stop, and then could not beat the car. Shortly after the car was overhauled. I suspect that it was a supply of oil, so the use of low-temperature startup hook car agents, none. It seems unexpected ...... too lazy to connect the oscilloscope and disconnect the cylinder 1 cylinder spark plug wire to see if there is a fire, then another master told me, no fire, but sometimes jump and leaped with car signs. I think crankshaft position sensor has a problem. Retrieval of fault codes reported to the crankshaft position sensor performance problems. Connect the oscilloscope to the crankshaft position sensor, hit the starter, see the waveform disorder, and the ideal waveform is completely different, this time taking into account the possibility that the crankshaft position ← This is what I do not want to face mistakes. Then remove the crankshaft position sensor, I found the head with iron, I thought it might be caused by iron, but in order to make money, then replace the crankshaft position sensor. Measure waveform, when the waveform is relatively neat, but the ideal waveform is different, and the car does not start sign, that is a reference to a power problem, unplug amount sensor waveform, this time found waveform rule, but significantly less for some. Remove the crankshaft position sensor, as viewed from the inside of the crankshaft signal plate hole, turn the crank, crank position signal found a piece of broken plate, and later replace the timing pinion when troubleshooting (crank signal plate integrally) is after. Changsha, where the most professional auto repair Summary: The car due before the overhaul, the crankshaft signal accidentally ruptured disc, because it was not fitting, so the crank signal plate installed after welding. Since the engine is running strong centrifugal force, and vibration, resulting weld sealing off, resulting in a lack of more teeth crank signal plate, then ECU has been unable to achieve the desired crankshaft position signal, you can not get the crank angle position, the engine will not start. Also car crankshaft position sensor is good for the miscarriage of justice here. In general, less likely to damage the crankshaft signal plate, the use of an oscilloscope, can make you more intuitive to see signals, and can get very positive analysis. Changsha, where the most professional auto repair