【Fault description】
    Mercedes-Benz S320, inline six-cylinder, the use of electronic throttle independent ignition, driving intermittent jitter when driving.
    【Inspection process】
    Through the round hole 38 hole self-diagnosis hole 4 hole (engine fuel injection control, ignition control system self-diagnosis), 7 hole (electronic throttle self-diagnosis) to read the fault code, all show the system normal code # 1. While the engine to accelerate the performance is good, so suspected ignition coil (three), sub-line, spark plug problems.
    First remove the six spark plugs, from the head of the color to know the burning situation is good, and the gap standard, the center of the carbon burning degree is small, so the spark plug to determine the good, turn by measuring the resistance value of the ignition coil and sub-line, Resistance value is similar and meet the requirements, the appearance of inspection is also good. So the leakage test, the results did not find a leakage phenomenon. On the characteristics of the car's independent ignition system, no need to use the oscilloscope is measured one or two ignition waveform.
    【Maintenance】
    Hard for a long time, but also can not think of the key. In theory, the ignition coil, sub-line of fire, spark plugs of the intermittent dislocation of the engine will lead to intermittent jitter. Finally replace six new BOSCHF-19DCD spark plugs. The problem is solved.