2007 Audi S4 Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 2007 Audi S4
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2007 Audi S4 ProblemsDecreased Power and Fuel Economy from Carbon Buildup
The 2007-2008 Audi RS4 uses the 4.2FSI direct injection engine. This engine is subject to carbon buildup in the intake system which can cause power loss, OBD codes and a check engine light, and a rough idle. In normal engines, the engine is cleaned by the gasoline flowing through the injectors and into the intake system, however, the RS4 uses direct injection so gasoline does not flow through common carbon buildup areas.
The solution is to remove the intake manifold and professionally clean the intake manifold, intake ports on the cylinder head, and the intake valves. This may need to be done in as few as 20,000 miles.
Our technicians recommend having the constant velocity (CV) boots and CV joints inspected at each service. Servicing torn CV boots early can prevent the need to replace the CV half shaft or CV joint.