Daewoo Prince excessive idling

        Symptom: a prince Daewoo engine idling excessive, turn off the engine when the big shake, that the car is 2.0 displacement engine, four-cylinder, electronically controlled multi-point injection.
        Troubleshooting: First of all tubes were certain external examination, the cause is not found. Then check the throttle and idle valve, and found that it too much kess v2 ecu programmer coke and sludge, suspected of issuing and air leaks, then thoroughly wash them, the fault persists after the trial installed. So he replaced the idle valve, but still does not work. So careful analysis that idling excessive because the intake air much reason. How much is the idle air intake valve controlled by a computer instruction and idle valve work, replace the idle valve does not work, indicating the reasons for failure are not idle valve, but in the computer, and then the engine fault light is not bright, electric control decoding data flow detection device, findings show that the engine water temperature is only 17 ℃, and the actual temperature and the instrument panel display serious discrepancies temperature, engine temperature at this time there have been 85 ℃, and upon inspection instrument sets and computer circuit diagram that just do not have the same water VDM UCANDAS temperature sensor. Water temperature sensor for electrically controlled check unplug the plug prong found serious rust, after cleaning up the plug, replace the water temperature sensor, troubleshooting, everything is normal.
        Failure Analysis: think through the signal from the temperature sensor, changed (because the resistance to rust at large), enter the computer, the computer judges believe the water temperature is very low, so the instruction plus rich hud mixture and increase the intake air, resulting in a normal idle temperature remains high after the failure, thus believe that the electronic control system after repair, it should be, but after the first simple complex, in order to avoid unnecessary detours.
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