Symptom: a Santana era Superman when accelerating.
     Troubleshooting: Initially suspected to have a leaky place, with a vacuum gauge to see MPA (intake pipe absolute pressure) vacuum 67.6kPa, and the amount of change is not great.
     Rapid opening and closing of the throttle, the needle in the 6.7 ~ 84.6kPa sensitive swing between, which can initially deny the possibility of leakage. Accelerated with a chemical cleaning agent in the vicinity of the intake pipe into the speed is basically not much change, the fault still,
     So you can rule out the leak. Replacement of the fuel filter and air filter, the fault remains the same.
     And then check the wiring is no exception, with experience that oxygen sensor failure. Detection found that the car in the throttle open process, the oxygen sensor output voltage signal did not change, this is the oxygen sensor damage, remove the top was brown, is lead poisoning. Replace the basic settings with V.A.G1552, and clean the fuel tank, troubleshooting.