Graham Rahal's IndyCar championship hopes suffered a serious blow when he wrecked Sunday at Pocono Raceway.

Rahal entered only nine points behind leader Juan Pablo Montoya and was running in 19th place when he connected with Tristan Vautier and both drivers smacked the wall.

Rahal was livid, hopped out of the No. 15 Honda and walked on the track to confront Vautier. Rahal removed his helmet, and pointed and shouted at Vautier before the drivers were separated.

Rahal and Vautier are both Honda drives. IndyCar warned drivers before the race to stay clear of the ones in contention for a better shot of a clean finish with only two races left in the season.

Montoya was fifth at the time of the crash and Rahal already had trouble in the pits earlier in the race.

The IndyCar championship will be decided Aug. 30 in the season finale on the road course at Sonoma.