Long night for the Honda-powered drivers.
Will Power's closest title rival encountered issues quickly at Sonoma.
Tough competition in Milwaukee this weekend.
Starworks return to DP competition will see Canadian IndyCar ace James Hinchcliffe behind the wheel.
Josef Newgarden: "Well, I think honestly the rain helped a little bit, just spread everyone out because it's so tight."
Further tests scheduled for three possible solutions.
Multiple cars took damage in a massive crash caused by a slick, wet track in Toronto.