Some 2010-2011 Ford Taurus, Flex, MKS and MKT vehicles equipped with the 3.5L gasoline turbocharged direct injected (GTDI) engine may exhibit rough running, hesitation and shuddering, with DTCs P0300, P0301, P0302, P0303, P0304, P0305, P0306 or P0316.
- If the engine build date is on or before 8-2-10, proceed to Step 3.
- If the engine build date is after 8-2-10, proceed to Step 6.
- If the spark plug has broken ceramic or the part number is CYFS-12F-3, replace all six spark plugs. Refer to the workshop, section 303-07.
- If the ceramic is not broken and the part number is CYFS-12Y-3, do not replace the spark plugs. Proceed to Step 7.
Advise the customer that this vehicle is equipped with an adaptive transmission shift strategy which allows the vehicle’s computer to learn the transmission’s unique parameters and improve shift quality. When the adaptive shift strategy is reset, the computer will begin a re-learning process. This may result in firmer-than-normal upshifts and downshifts for several days.