Shanghai Benz engine failure/Shanghai BMW automatic transmission failure alarm

Mercedes-Benz engine vibrates at idle speed
After receiving the car, our Xinchehui maintenance personnel connected the diagnostic instrument for self-diagnosis. The engine system has two fault codes. The content is as follows: the intake air temperature sensor is faulty and the oxygen sensor is faulty. There is a problem with the heater. 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, align the timing hole on the camshaft sprocket with the timing hole on the corresponding tile seat, and then turn the crankshaft to the position where the top dead center of the cylinder is advanced. , install the timing chain tensioner. After completion, test drive and completely eliminate the fault.
If you encounter problems with your car, you can contact Shanghai Xinchehui Industrial Co., Ltd. Shanghai Xinchehui Industrial Co., Ltd. provides you with professional maintenance services!
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