lenashadow1
AMG GT Turbo Issues and Resolution
Summary of the thread
A 2017 Mercedes AMG GT was experiencing poor engine response, a check engine light, unusual whistling and hissing sounds, stalling at idle, and increased fuel consumption. The suspected cause was a turbocharger issue, specifically related to the boost pressure actuator or the electrical bypass valve. After consulting with others, it was suggested that a boost leak might be the problem, likely due to a faulty actuator valve. The car was taken to a shop where the issue was confirmed and resolved by replacing the defective electrical bypass valve, restoring the vehicle's performance.
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4 comment(s)
lenashadow1 (community.author)
Thanks for the quick response! So, 'boost leak' makes sense. What exactly is the actuator valve doing? And where exactly should I be looking for these cracks and connections? I'm not super familiar with the turbo system layout on this car.
lilianphoenix1
The actuator valve controls how much boost the turbo system produces. Think of it as a gatekeeper for the pressure. If it's not working correctly, it can either overboost (rare in your case since you're losing power) or underboost, which sounds like what's happening. A defective electrical bypass valve can cause the valve to not open or close properly. Honestly, without proper tools, it's tough to pinpoint the exact location of the boost leak. Given all the symptoms, I'd suggest taking it to a trusted workshop. They can pressure test the system and accurately diagnose the issue.
lenashadow1 (community.author)
I took it to a local shop. They confirmed it was indeed the boost pressure actuator valve. Seems like the electrical bypass valve was defective, just like I suspected. Replaced it, and the whistling, hissing, and power loss are all gone! Runs like new. Total repair cost was around 250€. Thanks for pointing me in the right direction!
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lilianphoenix1
Sounds familiar. I've had similar issues with my AMG GT. Whistling and hissing is almost always a boost leak in the turbo system. If the actuator valve for the boost pressure is faulty, the turbocharger won't be able to regulate the boost correctly, leading to power loss and those strange noises. The stalling and increased fuel consumption also point towards that direction. Have you checked for any obvious cracks or loose connections in the hoses related to the turbo system?