William Byron‘s team is changing engines. That will cause him to start Sunday’s Cup race at the back of the field.
The issue was found early in Friday’s Cup practice at Texas Motor Speedway.
“We’d make a couple of laps … and then have some engine trouble,” Byron told Fox Sports 1. “So we’re just working through that.
“We really needed some practice time. We’ll kind of rebound from that and hopefully be able to make a lap in qualifying and see what the balance is.”