Then repair of a Mercedes-Benz S600 sedan, poor acceleration, an acceleration of the engine failure light will light up, tune fault codes, the contents of a multi-cylinder misfire prompt, the data show a mixed vapor stream is too thick, the air flow meter display value is too high, high fuel consumption. Replace the two ignition coils, spark plugs and air flow meter 24, test vehicle feel normal, delivery of the vehicle to the customer. The next day, we drove the car to the customer, said the fault is still not repaired. With diagnostic detection is still before the DTC, is that why?

     Analysis may be clogged exhaust catalytic converter that is, once the car exhaust back pressure is too high, the air flow meter or intake pressure sensor detects the large MB STAR diagnosis tool intake air signals. Fuel injection pulse width to increase, the actual lack of fresh air into the cylinder, mixing steam too thick multi-cylinder misfire and cause computer wrongly air flow meter or intake pressure sensor signal voltage is too high. In addition, the exhaust blockage can also cause high fuel consumption, noise, brake weakness, difficulty in starting can not even start to accelerate bad or intermittent can not be accelerated, cylinder fire, mixing steam too thick, acceleration knocking sound like. If the vehicle can also be normal speed, you can add non-corrosive fuel additive in gasoline tank to automatically repair; if the vehicle is no longer normal speed, clogging serious, need four catalytic converters removed, soaked with water plus oxalic acid, then tap water; if TWC endoscopy results seizure deformed, and that only replacement parts and check the oxygen sensor, depending on the need of replacement.