J Jb2490 New Member Aug 6, 2018 1 0 1 Michigan Aug 6, 2018 #1 Aug 6, 2018 #1 Sent a datalog to my tuner. He said I have a large vacuum leak on bank one. Did a vacuum test and I lost no pressure. What else could cause that fuel trim issue?
Sent a datalog to my tuner. He said I have a large vacuum leak on bank one. Did a vacuum test and I lost no pressure. What else could cause that fuel trim issue?