JOLIET, Ill. (AP) -- Weary from the cleanup of the manipulations to its championship field, NASCAR sought to restore its credibility Saturday with a stern warning about "artificially altering" events.
NASCAR chairman Brian France told the teams he expects them "to give 100 percent" at all times. He met with them for nearly 20 minutes between practices at Chicagoland Speedway on the eve of the opening race of the Chase for the Sprint Cup championship.
"I think we wanted to be very clear and we wanted to reinforce the cornerstone of NASCAR, which is giving your all," France said. "We addressed team rules, a variety of other things, all designed to do what our fans expect, and that means that their driver and their team give 100 percent to finish as high up in a given race as possible. We were very clear about that. That's our expectations."
The warning came after an unprecedented week for NASCAR, which has been rocked by developments since Clint Bowyer spun his car with seven laps remaining last Saturday night in the race that completed the 12-driver field for the Chase.
NASCAR was forced to investigate when it became clear that Bowyer spun in an attempt to stop leader Ryan Newman from winning the race to give teammate Martin Truex Jr. one last chance to earn a Chase berth.
The investigation uncovered at least three instances of race manipulations and led to severe sanctions against Michael Waltrip Racing and the removal of unwitting participant Martin Truex Jr. from the Chase in favor of Ryan Newman, who had been robbed of the race win.
The central piece of evidence was radio communications, and the penalties against MWR set off a chain of events NASCAR never anticipated.
Next came allegations of a scheme to sell track position and a new investigation involving deep-pocketed Penske Racing and tiny Front Row Motorsports. It culminated Friday with France's stunning decision to expand the Chase field to 13 drivers to accommodate Jeff Gordon, who had been bumped out of the Chase by the shenanigans of three drivers.
Gordon was pleased with the ruling, but uncomfortable with the way the week developed.
"The integrity of the sport has been put at question," Gordon admitted. "I think we have one of the greatest sports that exists. To see our integrity questioned is very upsetting to me, and I think we, along with NASCAR, have to solve this. I wish it had not happened under these circumstances."
NASCAR ultimately decided it couldn't prove Bowyer spun on purpose, but did find that MWR manipulated the race to help Truex by having Bowyer and Brian Vickers pit late in in the race. The idea was that Joey Logano would bump Gordon out of a Chase spot, and Truex would get in through a wild card.
NASCAR has tightened many of the areas that allowed the manipulations to occur in a series of new rules that were outlined for the teams and will begin today. Among them:
--No more deals, no altering the finish, no intentionally causing a caution or intentionally wrecking another competitior. The list of things not allowed is a work in progress, NASCAR President Mike Helton said. Penalties can include suspension.
--Only one spotter per team will be allowed on the spotter stand. It means Roger Penske can no longer watch the race from his preferred perch on the roof, and NASCAR will install a camera atop every roof to monitor the actions.
--Digital radios are now banned on the spotter stand, meaning spotters can no longer communicate on a private channel with a team.
--NASCAR said it will address new restart rules today. Some drivers have complained about inconsistency on how restarts have been policed all season, and fans complained winner Carl Edwards jumped early last week past leader Paul Menard. It's been overshadowed in the Chase controversy, and will apparently be addressed before today's race.