Q: What is the impact of carbon buildup on drive-ability, performance, emissions and fuel economy?
A: With regard to drive-ability, one of the more common symptoms is a lack of power, especially when driving at higher speeds. Other symptoms could include cold stalling and cold-start difficulties, including rough running when the engine is cold. There is also the possibility of a failed NOX emissions test and/or excessive ping on acceleration.
In some cases, carbon buildup may cause one or more cylinder misfire codes (P030X) which will result in fuel inefficiency and poor performance. This occurs when an insufficient number of cylinders fire while the vehicle is in operation.
If the presence of carbon deposits is not detected early enough or the buildup is severe, the check engine light may turn on and the vehicle is likely to fail inspection.
Information provided by: Robert Bosch LLC
