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I own a GLA 250 4-Matic and have now approx. 3000 miles on it.
When driving between 1000 and 1200 RPM, I experience a grumbling sound. It's just like the engine does not shift back in time or if the exhaust pipe is a bit loose and vibrates. When the sound appears and I shift back with the manual control, the sound disappears momentarily. Does anyone have a similar experience?
When driving between 1000 and 1200 RPM, I experience a grumbling sound. It's just like the engine does not shift back in time or if the exhaust pipe is a bit loose and vibrates. When the sound appears and I shift back with the manual control, the sound disappears momentarily. Does anyone have a similar experience?