Workin on a 03 F150 4.6L eng. It has PO171, PO174 stored in it. The total fuel trims in the freeze frame are B1=38.3, B2=35.9 @1332 rpm and 183 degrees. I smoked the engine for leaks and didn`t find any. Scan data showed baro to be 26 hg and 145 hz. (normally ... Login to read more.