For the second successive race at Pocono, Tony Stewart will be forced to drop from pole position to the rear of the field after going into the wall during practice for the Pennsylvania 500.

Stewart had secured pole for the race thanks to his position as championship leader after qualifying was rained out on Friday - as it was for the Pocono 500 back in June.

Then, Stewart was forced to go to a back-up car following a crash at turn two, but it did the Stewart-Haas Racing driver no harm as he came through the field to secure his first win in the Sprint Cup since becoming an owner/driver at the start of the year.

This time around, Stewart made an error at turn three which saw him go into the wall on the outside of the circuit, sending the points leader to his spare car.

"I just...I screwed up," Stewart said. "I got in too deep and got loose and couldn't save it.

"I tore up a really good race car today."

Stewart will now race chassis #14-487, which he took to third place at Darlington.