Reasons for Audi Intake Flap Stuck in Open Position
2 Answers
Audi intake flap stuck in open position is caused by damaged position sensor or intake manifold failure. The details are as follows: 1. Throttle position sensor: The throttle position sensor monitors the opening angle of the throttle valve to determine idle, full load, acceleration/deceleration conditions, and implements corresponding fuel injection control based on throttle opening status. 2. Intake manifold pressure sensor: The intake pressure sensor provides engine load information by measuring intake pipe pressure to indirectly calculate the air intake volume, then converts it into electrical signals for the ECU through internal circuits. 3. Intake air temperature sensor: Provides air temperature information for fuel injection volume and ignition timing correction. 4. Crankshaft position sensor: Provides engine speed and crankshaft phase information as reference points for fuel injection timing and ignition timing.
I once encountered this issue, primarily caused by excessive carbon buildup on the valve body, which made the flap immovable. When the engine runs for extended periods, oil vapor and exhaust gas recirculation mix together, forming a thick layer of black deposits at the intake port—especially common in premium cars like Audi. Another cause is a damaged actuator motor, leading to control failure. If the flap gets stuck in the open position, excessive air intake can cause unstable idling, noticeable power loss during acceleration, and possibly abnormal noises. Worse, carbon buildup can spread throughout the intake system, increasing fuel consumption and emissions. I recommend promptly using professional cleaning agents or performing regular intake manifold maintenance to prevent more severe damage. Daily driving should avoid frequent short trips with repeated starts and stops to reduce rapid carbon accumulation. If this problem isn’t fixed promptly, costly replacement of new components is inevitable—so don’t delay.
