No. Carbon buildup would only affect engine compression which would result in rough idling, difficult starting and performance issues.
The valve seals are to prevent the oil from getting into the cylinders and exhaust system. If the valve guides are worn, which are rare for this engine, they would result in leakages through the seals as the valves would be tilting when in operations.
Tuesday, August 28th, 2012 AT 5:29 AM