Helio Castroneves dominated the race and Gil de Ferran took over the series points lead Sunday as the teammates started and finished 1-2 in the Shell 300.
Castroneves, who hadn't won a CART event before this season, has three victories on road or street courses.
Castroneves led all but two laps at Laguna Seca Raceway. Juan Montoya lost any chance at the victory on Lap 48 when his airjack collapsed under the car during his second stop. That gave the runner-up spot back to de Ferran, who finished 8 car-lengths behind his teammate.
ITALIAN GRAND PRIX: A tearful Michael Schumacher found little reason to celebrate after his victory in Monza. Schumacher's win was tempered by the death of a track worker. Paolo Ghislimberti, 33, a track crew member, was killed by flying debris after a first-lap chain collision. Schumacher's Ferrari finished 3.81 seconds ahead of his McLaren rival, Mika Hakkinen. The victory was Schumacher's third in five years in the Formula One race and his sixth this season. The Formula One Association, meanwhile, called for track improvements and an extension to the pits area. The Monza circuit has long been under scrutiny of environmentalists and the Italian Green party opposing new works and constructions. The FOA can decide to move a Grand Prix if its demands are not met.