故障现象客户反映,早上发动机起动困难。故障诊断接车后,首先验证故障现象,起动机正常运转,发动机很难起动,要多次起动才能着机。着机后发动机怠速不稳,加速无力,并伴有排气管“放炮”的现象。待发动机运转一段时间后,熄火重新起动发动机,发动机顺利起动。经过多次试车观察,发现该车故障为冷车难起动,待发动机冷却液温度上升后,一切正常。结合上述故障 Failure phenomenon Customers reflect the morning engine start difficult. Troubleshooting After receiving the car, the first to verify the failure phenomenon, the starter normal operation, the engine is difficult to start, to be started several times in order to machine. After the engine idle speed instability, weak acceleration, and accompanied by the exhaust pipe “shooting ” phenomenon. After the engine is running for a period of time, the engine is restarted after the engine is turned off, and the engine starts smoothly. After several tests and found that the car is difficult to start the car cold, engine coolant temperature to be increased, everything is normal. Combined with the above failure