Symptom: Honda Accord car mileage of 80,000 km, parking once a year to use, the engine working condition is very poor, abnormal sound, speed up the poor, work less than 20min, the water temperature reaches 110 ℃, water tank boil.
    Troubleshooting: check the cooling system, the water tank and water pipes are normal, cooler dirty, replace the new coolant, cold start, found coolant cycle is good, the engine work within 15min, the water temperature is normal, electronic fan work well, high and low speed electronic Fan can work properly.
    The engine continues to work, the water temperature rising, about 25min, the water tank boil. Suspected pump or thermostat problems, remove the pump check and found that the pump without any exception, remove the thermostat, so that the cooling system has been in a large cycle, start the engine test, the fault remains the same.
    Check the engine oil, there is no signs of seepage, but the oil is biased. Because the car is abnormal sound, you must dismantle the engine. After the disintegration of the engine, found that the crankshaft strain serious, more than repair the limit. Crankshaft bearings, connecting rod bearings are also serious nap. The owner asked to replace a new engine, the engine is still high after the replacement of the water temperature.
    After careful consideration, suspected muffler faulty. Hand shake the muffler, hear the sound. Because the car parked for one year without tube, the internal serious corrosion, rust rotten into pieces, blocking the exhaust pipe exports, the engine exhaust is poor, the temperature continues to rise, so that oil deterioration, the formation of dust particles, so that oil can not afford Lubrication, but exacerbate wear and tear, so that the engine severely damaged.
    Replace the muffler, troubleshooting.