VW TDI Power Loss: Intake Manifold Flap Problem Fix

I experienced a very similar issue with my 2014 Multivan TDI. The symptoms you describe match exactly what I encountered, reduced power, engine running rough, and that distinctive hissing noise from the intake area. The engine light came on during my issue, and diagnostic testing revealed a faulty intake manifold flap control. These flaps regulate air intake flow, and when they malfunction, it typically causes engine misfire and the symptoms you mentioned. After some research and consulting with my regular workshop, they confirmed the diagnosis and replaced the faulty unit. The total repair cost was 465€, including parts and labor. Since the fix, the engine has been running smoothly with proper power delivery and no more concerning noises. Before suggesting specific solutions, could you provide: Current mileage, Whether the engine light is on, Any diagnostic codes if scanned, When the symptoms first appeared, Any recent maintenance history This information would help determine if your issue is identical to what I experienced and whether the same solution would apply. The intake manifold flap control is a common wear point on these engines, but its always best to get a proper diagnosis before proceeding with repairs.

Thanks for the helpful information. My current mileage is 54827km and the last service was completed 2 months ago. Since posting, I had the engine scanned and it showed error code P2015 related to the intake manifold runner position sensor. The check engine light started flashing intermittently last week. The reduced power and engine misfire symptoms began about 3 weeks ago but have gotten progressively worse. The air intake hissing noise is most noticeable during acceleration between 2000-3000 RPM. Based on your experience and costs, I will book it in with my regular workshop to have the manifold flap mechanism inspected and likely replaced.

Thanks for providing those additional details. The error code P2015 definitely confirms what I suspected based on my own experience, its the intake manifold flap control malfunctioning. The RPM range where you hear the hissing matches exactly with when I experienced the worst airflow control issues. The progressive worsening of engine performance and timing of symptoms also aligns with how my problem developed. My repair involved replacing both the flap mechanism and position sensor since they work as one unit to maintain proper engine performance. The repair resolved all symptoms: Restored normal power delivery, Eliminated the hissing noise, Fixed the rough running, Returned fuel consumption to normal, Stopped the engine misfire issues With your mileage being similar to when my issue occurred, and identical symptoms presented, you should expect comparable repair costs around 465€. The job typically takes 2-3 hours for an experienced technician. Getting it fixed promptly is important since continued operation with faulty intake manifold flaps can potentially cause additional engine performance issues over time.

Thanks for the feedback. The diagnostic scan results and your repair experience match my situation perfectly. The P2015 code and symptoms involving reduced power and that specific hissing noise during acceleration really help confirm the intake manifold flap control issue. Based on this information, I have scheduled an appointment with my workshop for next week. They quoted around 450€ for the complete repair including parts and labor, which aligns with the costs mentioned. They will replace both the flap mechanism and position sensor as a complete unit. The progressive nature of the symptoms and potential for further engine performance issues if left unfixed convinced me to address this promptly. Looking forward to having proper power delivery and airflow control restored, along with eliminating that concerning engine noise during acceleration. Will update once the repair is completed in case others encounter similar intake system problems in the future. Really appreciate the detailed insights that helped pinpoint this issue.