Daewoo Car Engine Failure Analysis and Maintenance ? Engine ...

Daewoo Car Engine Failure Analysis and Maintenance ? Engine ? Automotive repair and maintenance indu

Article by hi joiney

Case of an engine difficult to start the Daewoo PrinceDaewoo Prince 1996 annual a car, the engine difficult to start, in the time required to press the accelerator pedal start, release the accelerator pedal when the engine immediately Extinction No Idle, Exhaust issue ?chug? sound accompanied by choking petrol fumes.Related Reading: How to extend the life of the engine valve train?? Modified turbo engine intake system introducedAccording to car speakers car been operating normally, since the friend openedAuto Repair Inside the engine after doing a routine maintenance of the above failure. Having asked that, when the maintenance-free demolition equipment with engine fuel system cleaned, cleaned with detergent Throttle Body, and replace the fourSpark Plug, 3 filter and oil after the failure occurred. To rule out the possibility of the failure, repair shops and normal operation of the vehicle had changed his intake pressure on Sensor, Temperature sensors, and dismantling the fuel system several times, but none solve the problem.By visual inspection of the engine and found that the tubes and wires connected, also found no signs of leakage. Dismantling the four spark plugs, spark plug head were found in 4 black. The test spark plug is working properly, the output high voltage spark strong. Connection Decoder Diagnosis, instrument displays ?33? number fault code, fault code is the meaning of the intake manifold absolute pressure sensor signal voltage is too high. Will be transferred to the engine throttle opening angle of the analog speed 800r/min when the inlet pressure sensor by measuring the output voltage of 3.8V. Connect the oscilloscope measuring oxygen sensor signal, its voltage is 0.5V less frequent changes, showing Mixture in the state. View of the maintenance after the engine failure occurred, combined with comprehensive analysis of the test results above that the throttle closed strictly affect the actual amount of mixture to enter. ECU through the inlet air pressure sensors signal the need enriched, while the signal from the oxygen sensor feedback is rare, so ECU to control the enriched mixture, and thus give rise to the failure. Caused by excessive intake manifold pressure of the main reasons are as follows: vacuum leak. inadequate intake and exhaust lift gate. strict intake and exhaust doors closed. exhaust system blockage. According to the Failure and more of these tests, only more likely, by measuring cylinder pressure and found that 3,4-cylinder cylinder pressure was less than the standard value. Further analysis, the failure of the main reasons for the two cylinder pressure is too low, but the reason for the low pressure valve closed lax. The car in the maintenance process, the cleaning throttle body, the cleaning agent under the throttle body and inlet of the dirt and charcoal washed away, when a large coke particles into the air through the door, stuck in the valve hysteresis work surface, resulting in a valve closed lax. Based on previous experience repair, in the throttle body or inlet cleaning, it may appear idle and poor acceleration instability phenomena (due to inlet and outlet door of a small card lag), as long as the vehicle to run period of time or trouble will go away after a few days. However, there are two kinds of exclusion that the fault easy way: When the engine is running, with a cleaning agent sprayed into the inlet until the coke discharge. as far as possible the engine running at high speed, because only then inhaled the gas mixture over the engine, resulting in a large amount of ventilation, forced into the exhaust outside the door of the coke was crushed disallowed. Methods such as using 1 for the three-way catalytic equipped vehicles, sometimes appear red due to overheating the exhaust pipe of the phenomenon, we used 2 methods. When the car driving through the road test is about 20km or so, the failure go away. Daewoo Prince Example 2 engine running badDaewoo Prince an annual output of cars in 1996, unstable idle speed up the exhaust pipe when the surge and the black smoke, and sometimes automatically turn off. The understanding of the car accident car, the sheet metal during the period of Battery Fully discharged, then start using the cross-power, in order to recharge the battery power loss, so the engine running for about 1h after the above failure occurs. Then after the vehicle was found by test failure symptoms as mentioned above, the first use of decoders and obtain fault code display apparatus 14, temperature sensor, 21, throttle position sensor, intake air temperature sensor 23 and intake 34 manifold absolute pressure sensor 4 fault codes, clear fault codes. When the engine is running in a different situation again after about 20min fault code and obtain still more than four fault codes. Vehicle electronic control system according to the structure of circuit theory and previous repair experience, initial analysis showed that four sensors fail simultaneously is unlikely, the failure should be part of the line. The ignition switch to ?OFF? position, unplug the four sensor plug. The ignition switch to ?ON? position were measured with a voltmeter 4 voltage sensor parameters are normal, the sensor output signal to the ECU connections between the good and dismantling the four sensors to do a simulation of the dynamic tests are normal. Through the throttle position sensor signal dynamic measurement, and found a strange phenomenon, when the throttle at a fixed location and found the output signal voltage fluctuations, and then the other three sensors were measured, voltage fluctuations are higher and further found that the signal voltage measured by its fluctuations in the volatility of the reference voltage formed. Suspected components is the first time generator and batteries, such as the generation of instability and damage the battery (due to excessive discharge of the battery has the potential for damage) will lead to the failure. When the engine running at idle condition, turn off all electrical equipment, generators by measuring the output voltage between 13.3 ~ 13.8V replacement battery after the test, failure still. The measurement of idle generating output value for the stability of 13.5V, the battery output is 13.5V, ECU for the 13.0V input stable values of the bond strap line measurement of ECU were normal. Thus we conclude: ECU input voltage normal, but the output voltage is not balanced. Voltage due to the instability of output parameters, which lead to the distortion of sensor signals, when the ECU, after receiving the wrong signal to the control is going to make mistakes, thus determine the fault has formed a complete causal chain, thus replacing the ECU, after fault entirely ruled out.

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