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Model: Equipped with U151E/F automatic transmission. Issue: Highlander 2nd to 3rd gear shock. Diagnosis: When the vehicle accelerates hard, a forced downshift occurs from 3rd to 2nd gear. As speed increases, and when the throttle is removed, the engine load is lessened. The vehicle will shift from gear 2 to gear 3 (the typical car upshift will be seamless if you don't step on the accelerator), but if you accelerate engine load will increase, and the engine and transmission computer will change gears. When overtaking, the car will automatically shift to a lower gear. If the U250E transmission is in...

[Repair Case] Lumina can’t drive at high speed Model: 3.1L engine and automatic transmission. Issue: When the car is operating, the driver reports that it becomes harder to increase the speed even if the accelerator pedal is depressed. The vehicle's top speed is limited to 44 miles per hour. After inspection by maintenance staff the defect is assumed to be the automatic gearbox lock. The automatic transmission system is in good working order, transmission oil is adequate, and the internal friction components are not overly worn or burned. Diagnosis: A stall test was performed. The drive gear has a stall...

Issue: The car was towed to the repair shop for maintenance because it wouldn’t start. The preliminary inspection result showed that there was a high-pressure fire, but there was no fuel injection. Troubleshooting:  The engine is equipped with a HEI-EST ignition system, which stands for high-energy electronic ignition. For the fire test, we unplugged the sub-cylinder high-voltage cable to test for firing; the sparks were very strong. Next, we used chemical cleaner into the intake manifold, and the engine could barely operate. We used an external pump instead of the fuel pump of the original car to build up the...

Model: Audi A6, equipped with 2.4L engine. Driving Mileage:31068 miles.  Issue: According to the driver, the engine is prone to stall failure during the driving process after warming up, and it is difficult to restart the vehicle after stalling.  Troubleshooting: There is no failure code when using the Chinese V.A.G1551 diagnostic tool to self-diagnose the engine control system. When starting the engine, it runs smoothly at idle speed in idling conditions. There was no visible aberrant data when it was examined. The problem is considered to be in the engine fuel delivery system, based on the fault characteristic mentioned by...

Make: Porsche Model: Cayenne. Mileage: 168,365 miles The gear display of the Porsche Cayenne is abnormal. Troubleshooting: Verify the fault after connecting the car. As stated by the customer, the diagnostic instrument detects that the transmission reports a fault, and the selector lever switch is grounded. Modules related to gear display include transmission control unit, gear switch, gear selector switch, and transmission valve body control unit. The gear selector switch is located under the cover of the gear lever. After disassembling, it is found that there are obvious traces of water ingress. Measure according to the circuit diagram and find...