Symptom: a Passat B5GLi car cold car can not start the car, but the starter running normally. If the foot slightly on the throttle pedal, continuous switch ignition switch start several times, the engine can start. If at this time a little loose throttle pedal, the engine will immediately turn off. If the engine is kept in this state for 10 minutes, the engine is working properly.
    Troubleshooting: First use the Volkswagen-provided Diagnostic V. A. G1552 on the engine electronic control system to detect, type the address word 01, enter 02 query fault function, check the fault code: 17916P1508035, the fault is to reach the idle speed adjustment system theory upper limit. Type 05 to clear the fault code and turn off the engine. Then, restart the engine again to check that the fault code 17916 still exists.
    Using 08 function to check the data block, did not find other abnormal circumstances. Asked the driver, learned that the car has been driving 20,000 km did not change the air filter. Open the air filter, see the filter sticky dust, replace it and clean the intake line. Again with V. A. G1552 Clear the fault code. According to the analysis of the fault phenomenon, may be air flow meter on the film attached to the dust caused by the intake air quality signal due to misalignment. With compressed gas on the hot film after cleaning, troubleshooting.