What does it mean when the fuel system is too lean?
What does it mean when the fuel system is too lean? P0171 The P0171 code means that, on the first bank of the engine, the fuel system is running weak or a vacuum leak exists near this side of the engine. A lean condition occurs when the engine either receives too little fuel or too much air. How to build a Ford Ranger 4.0L OHV engine? Check this article on ‘ How To Build A Ford 4.0L OHV For Power ‘. Tom Morana: Offers numerous products for the 4.0 including stroker kits, camshafts, connecting rods, pistons, cylinder heads, and supercharger...