Automotive spark plug failure example

    Models: a 02 models Changfeng? Cheetah V6.3000 vehicle mileage of 113,000 km.   
Failure phenomenon: when the car is traveling at a speed of 40 km / h to 70 km / h, the engine have a the towering car "phenomenon. If the vehicle speed is below (above) 40km / h or 70km / h when driving,X431 towering car "phenomenon will disappear, especially in driving change from 3rd gear to 4th gear after, this time hard acceleration, the engine power of nausea , significantly underpowered. If traveling with four-wheel drive (4WD), sometimes flameout phenomenon, traveling with two drive failure phenomenon has been reduced.
   
Troubleshooting and excluded: road test provided by the owners fault phenomenon, I feel the problem should be in the ignition system. Resistance with a meter to measure the high-voltage lines, 2-cylinder high-voltage resistance is too large, the replacement of the original high-voltage lines, road test after the fault GM Tech2 disappears. A few days later, however, owners complained that, after the replacement of high-voltage lines just normal driving five days now the towering car "phenomenon appeared. Owners doubt the quality of the high-voltage lines, the request to replace a new set of high-voltage lines, in order to determine whether the high-voltage quality problems, change pieces of law and the same car swap high-voltage lines, after comparing the towering car phenomenon is still not disappeared, high-voltage lines to normal. Check the spark plug when the spark plug non-original spark plugs to replace all the original spark plug after the test, the fault disappears. Thought this thorough troubleshooting, but 3 days after the owners took the car back, complaining about the the towering car "phenomenon appeared.
  
Why have replaced the high-voltage lines, spark plug, the the failure phenomenon will disappear immediately, but after a few days appeared? Can not explain this strange failure phenomenon due to the lack of testing equipment. Consult with friends go to the repair station, he said that this failure phenomenon 車LEDライト should replace the original spark plug, I told him to spark plugs have been replaced with the original parts, but friends doubt the quality of the spark plug, so a friend after work brought from the service station the spark plug after installation, commissioning, fault disappears. Recommended under previous owners and then driving a few days observation, the owners phoned reaction two weeks after "towering car" phenomenon never appeared.
   
Fault Summary: replace the spark plug should pay special attention to the heat value of the spark plug is in line with the original standard. Some maintenance sector peers at work tend to replace the spark plug generous, sometimes considered the high price of the spark plug must be better than the low price of the spark plug, like platinum spark plugs stronger than the ordinary type spark plug, platinum spark plug ignition, reducing the combustion indoor EDM, erosion and corrosion phenomena, and to produce aecu チューニング stronger spark life than ordinary spark plugs greatly improved, but is not suitable for each engine. Individual spark plug maintenance or repair shop to buy poor quality, accessories appearance alone is difficult to distinguish its quality, so our work will not be able to make the right judgments.