17/08/2026
Only 150,000 km—and this is how much carbon had accumulated.
This 2007 Audi RS4 recently visited Limited Automotive for a comprehensive intake carbon clean and walnut blast.
Its high-revving V8 uses direct fuel injection. Because fuel is injected directly into the cylinders, it doesn’t wash over the intake valves. Over time, substantial carbon deposits can develop and begin restricting airflow into the engine.
We removed the intake manifold and cleaned each intake port and valve using specialised walnut-blasting equipment, carefully removing the hardened deposits you can see in the before photos.
Depending on the vehicle and severity of the buildup, carbon cleaning may help restore smoother power delivery, improved throttle response, more consistent idle quality and performance that has gradually been lost.
This isn’t a chemical added to the fuel tank. It’s a thorough, hands-on mechanical cleaning process performed directly at the intake valves.
Does your Audi or other German vehicle feel less responsive than it once did?
Contact Limited Automotive to discuss your vehicle, It deserves it.
German precision, local passion.
Devonport, Tasmania