VW Touareg Engine Stalling: IAC Valve Troubleshooting

Had the exact same stalling engine issue on a 2013 VW Tiguan. The IAC valve and surrounding air intake system were heavily contaminated, causing irregular idle speeds and eventual stalling when stopping. After proper diagnosis, cleaning the idle air control valve and intake manifold resolved the issue. The air valve was working incorrectly due to carbon buildup blocking proper airflow regulation. This is a common problem around 90-100k km on VW engines. The repair involved: Complete air intake system cleaning, IAC valve removal and thorough cleaning, New gaskets installation, Intake manifold cleaning, Computer system reset This was a serious repair that required specialized tools and expertise. Without proper maintenance, it can lead to further engine performance issues and potential damage to other components. Recommend finding a shop specializing in VW engines, as correct diagnosis and repair procedure is crucial. The stalling symptoms paired with the check engine light strongly suggest air flow regulation problems, which matches classic IAC valve issues.

Thanks for sharing your experience with the IAC valve repair. Dealing with very similar symptoms on my 2016 Touareg right now. The irregular idle speed and engine stalling are really concerning. This gives me hope that a thorough cleaning of the air intake system might solve my issues. Do you remember roughly how much you paid for the complete repair work? Also curious if youve had any recurring problems with the idle air control valve since the fix was done? The prices at VW dealers can be steep, so trying to get an idea what to expect before going in. Also want to make sure this actually fixes the problem long-term.

Following the IAC valve repair I mentioned, I can confirm it completely resolved the idle speed issues. The engine now maintains steady idle and the stalling problem never returned. After 2 years, the throttle body and intake system are still working perfectly. The total repair cost was 425€ which covered the thorough cleaning of the heavily contaminated intake system. While not cheap, it was worth it to restore proper engine idle function and prevent further issues. The price included complete cleaning of all air intake components and recalibration of the idle control system. My advice would be to get it fixed soon, as running with a faulty IAC valve can lead to more expensive problems. Regular maintenance like this is actually cheaper than waiting until more serious engine issues develop. For reference, the mechanic showed me the buildup they cleaned out, it was surprising how much carbon deposit can accumulate in the idle air control system over time. A specialized VW shop should be able to handle this repair competently.

After getting some helpful advice here about the idle control issues, I finally took my Touareg to a certified VW specialist. The diagnosis confirmed exactly what was discussed, severe carbon buildup in the air intake system and a contaminated IAC valve causing the engine stalling. The repair cost came to 460€, which included: Complete air intake cleaning, IAC valve service, New gaskets, System diagnostics, Computer reset The mechanic showed me the removed parts and the carbon buildup was shocking. The entire process took about 4 hours, but the car runs perfectly now. No more stalling at idle speed and the check engine light is gone. For anyone facing similar issues, investing in proper repair at a specialized shop is worth it. The air valve cleaning made a huge difference in how the engine runs. Much better experience than my previous mechanic who just wanted to replace parts without proper diagnosis. Glad I asked here first and knew what to expect when going in for the repair. The idle control is now smooth and consistent.