Symptom: a 4-cylinder 1.8-liter multi-point spray Passat car cold car hot cars are difficult to start, no idle, exhaust pipe smoke smoke, car boring.
    According to the driver said the car petrol pump just change soon. Start the car when you need to step on the accelerator pedal, the starter to play for a long time to the car, no idle, if the lift pedal that is stalled, and now can only adjust the throttle to maintain the idle speed. And the engine speed is lower than 2000 transfer file start easy to turn off. In other repair factory inspection that is electronic throttle bad, need to be replaced.
    Check the repair: first remove the four spark plugs and found that each spark plug center electrode around the ink, indicating that the mixture is too thick. Replace the new spark plug, with the decoder on the dashboard 16 feet diagnostic seat to read the fault code. Which has a throttle position sensor, oxygen sensor, carbon canister solenoid valve, air flow meter four fault code. Eliminate the fault code. Re-start the car, after a period of time, the oxygen sensor fault code re-emergence, other fault code no longer appears. Indicating that the failure code does not appear may be caused by the person in the inspection. Because the exhaust smoke smoke. So the oxygen sensor fault code is also normal. The driver insisted on checking whether the electronic throttle valve is faulty, so further measure the resistance value of the throttle motor and the throttle position sensor. The data indicate that the idle contact is good and the resistance between the feet is fully stable from full throttle to fully open, so it can be determined that there is no fault. Re-start the car, check the air flow meter feet voltage, the car air flow meter for the three-wire, one is FireWire, one is the ground, there is a signal line to the computer. Measure the letter line voltage, idle at 1.4V, with the increase in speed and increased. So the intake air flow signal is also normal. Ask the driver whether the cleaning nozzle, the driver said more than forty thousand kilometers without cleaning the nozzle, so remove the nozzle for cleaning. Clean the drums to listen to clean, re-installed oil pressure regulator and fuel injector, while replacing the fuel pressure gauge, measured at the time of idling oil pressure quickly reduced to zero. And then start the car in the stall while holding the tubing is still reduced to zero.
    Can be sure that the pump has a problem. From the tank out of the pump and found that the pump is not the Passat car pump, after asking the driver to know, because did not buy the original car pump, so buy a deputy factory Audi V6 petrol pump to replace, but I do not know the two pump oil Pressure is different, but not the factory accessories. On the one hand, high oil pressure, on the other hand without pressure, no wonder the good start also smoke black smoke. Put on a new original car pump, start and burn greatly improved. In the small throttle to feel weak when accelerating. Re-adjust the ignition timing, with the decoder to eliminate oxygen sensor fault code, road test, to a variety of speed test are feeling good, difficult to start, no idle, black smoke, easy to turn off and other failures are eliminated. Re-code is also normal.
    Summary: The car is not easy to start because of high oil pressure, fuel injection, only step on the accelerator pedal, increase the intake volume to the car. Hot car because no pressure, resulting in air resistance and difficult to car. When the car started, due to high oil pressure, fuel injection in the idle conditions too much, the mixture is too strong and flameout, only to open a large throttle to increase the intake to maintain idling. The mixture is too thick and the cylinders are burning. So the black smoke car boring, in the car repair process first driver to provide a misleading "oil pump just change soon", and then insisted that the electronic throttle is faulty, according to the error message, in the repair obviously gone path. So the future repair practice, it is necessary to refer to the driver's statement, but also according to the actual situation to take the best maintenance program.