Common 1.4 TFSi & 1.4 TSi problems identified in this article. Slow Warm Up Issues; Carbon Build Up On All Pure Direct Injection Variants. High Oil Consumption on Early 1.4 TFSi TSi Engines; Weak Diverter Valves; Crankcase PCV leaks; Excessive Wear on the Cam Followers Any suggestions for Golf 7 1.4 TSI ACT performance mods Hey guys, I'm looking in to some performance modifications for my Golf 7 1.4 TSI ACT (2013) and it aB6I.