A PASSAT1.8T manual gearbox, the factory date for April 2002, the engine number AWL318882, chassis number LSVCD49F822242569, mileage 58000km. The driver reflects a period of time the engine lack of oil, anxious to accelerate the phenomenon of black smoke exhaust pipe, requiring maintenance.
    We first proceed to solve the engine to speed up the exhaust pipe black smoke failure. Engine after the rapid acceleration test did find the exhaust pipe in the black smoke, but did not find the case of blue smoke.
    Exhaust pipe black smoke that the engine mixture of gas, combustion is not complete. Routine inspection found that only three-cylinder spark plugs were very dark, apparently badly burned, and other spark plugs showed good burning.
    According to the general situation, less than 60,000 km of the car, not to the valve when the oil seal damage. So we first check the four cylinder cylinder pressure, respectively: (Note: 1bar = 100kPa)
    1 cylinder 2 cylinder 3 cylinder 4 cylinder
    11.6bar11.1bar12bar11.6bar
    Cylinder standard pressure of 10 ~ 13bar, the pressure difference between the cylinder is not more than 3bar normal, the cylinder pressure without any abnormal situation. Check all the nozzle drip, four are basically the same, there is no drip phenomenon. Check the gasoline pressure for idle at 3.7bar, higher than the normal value of 0.2bar, it is estimated that gasoline is not good oil. Remove the oil pressure regulator after the observation found that a small filter is almost blocked, replace the other car's oil regulator, the gasoline pressure back to 3.5bar.
    With the special instrument VAG1552 read no fault code found. Observing the ternary catalysis after the oxygen sensor data was found to be always too large to change around 0.655V, apparently indicating a mixed gas concentration. The engine slowly accelerates the discovery of oxygen sensor data can change between 0.1 ~ 0.7V, idle when the car and returned to 0.655V or so.
    Will be the third cylinder spark plug, ignition coil and the nozzle and the first cylinder of the swap and then observed for a week and found that the original installation of the first cylinder when the spark plug is very good to change to the third cylinder after the black, indicating that Symptom is not related to spark plugs, ignition coils and fuel injectors.