How about the Mercedes-Benz S-Class? /Shanghai Benz engine maintenance

Mercedes-Benz engine vibrates at idle speed
After receiving the car, Xinchehui technician connected the diagnostic instrument for self-diagnosis. The engine system has two fault codes, the contents are as follows: the intake air temperature sensor is faulty, and the oxygen sensor heater is faulty. . Clear the fault code, only the fault code remains which cannot be cleared. Check the engine configuration, there is no oxygen sensor, which means that the fault code is related to the engine configuration, existed before the overhaul, and has nothing to do with the idle jitter fault. Looking at the data flow, under idle speed, the fuel injection time is , and the air flow rate is , both of which are relatively large. After repeated adjustments, the fault symptoms did not improve.
Observe the engine working conditions and find that the jitter frequency is high. This problem is usually related to the valve timing error. Open the valve chamber cover and recheck the valve timing. It is found that the exhaust camshaft of the right bank cylinder is advanced by approximately 10 seconds. It seems that the fault is caused by the valve timing deviation. Remove the timing chain tensioner, reassemble the valve mechanism, and align the timing hole on the camshaft sprocket with the timing hole on the corresponding tile seat (bolts can be passed through the timing holes to fix the camshaft The sprocket then rotates the crankshaft to the position where the cylinder top dead center is advanced, and installs the timing chain tensioner. After completion, test run and the fault is completely eliminated.
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