1.The car situation:
Mileage over 226,000 km of the Buick Regal sedan. The car in normal driving, frequent stalling phenomenon, often stall during idling.
2.Failure Analysis:
After each turn off, start the engine again, are relatively smooth.
A. Start the engine diagnostic tool dedicated connection, check the various data in the idle state, the data from the diagnostic tool to observe a variety of data and maintenance manual provided basically the same, and no fault codes. After about 10min later, really turn off, start the engine remains smooth start again.
B. In the hydraulic test ports at the fuel pressure gauge connected, start the engine, the fuel pressure is around 280kPa. After closing the engine oil pressure remained unchanged, when a failure occurs, the oil pressure has not fluctuate, indicating almost no fuel system problems.
C. Because after every start stalled relatively smooth, so check the ignition coil respectively, power lines, spark plugs, is also normal.
3.Troubleshooting:
The car's fault analysis may be part of the engine electronic control. After the crankshaft position sensor signal is lost, the vehicle can not be started, signal interruption, the vehicle can still be re-started again, the interrupt signal unplug and re-start the engine and found no fault in the operation of nearly one hour in the process, can be seen in the failure signal. Detection ICM (Ignition Control Module) and PCM (powertrain control module) between the signal line, were not found in open or short circuit, replaced troubleshooting ICM.