The grid order for this weekend's Indy Lights race in Houston will be determined by entrants' points due to scheduling chaos caused by track repairs.
Friday's running time was delayed by three hours to allow a temporary chicane to be built at the end of the main straight after the bumps were found to be so severe that they were launching GT-style cars into the air.
Further work was done to the affected area of the track overnight.
No official reason was given for the decision to scrap qualifying, however the move is a significant one in the context of the championship battle, where the top four drivers are covered by just 11 points with only two races remaining,
Points leader Sage Karam will start from pole position alongside Carlos Munoz, with Gabby Chaves and Jack Hawksworth on the second row.
Irishman Peter Dempsey, who is fifth in the drivers' points, will start from eighth following his switch to Team Moore Racing's #8 entry in the lead-up to this weekend.
That car was formerly occupied by Juan Pablo Garcia, who in turn moved into the #5 Belardi car previously driven by Dempsey and will consequently start from fifth.
Series returnee Conor Daly, who was third fastest in Friday's practice session, is expected to start from 10th.