One problem related to car accelerates on its own has been reported for the 2004 Toyota Scion Xa. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Toyota Scion Xa based on all problems reported for the 2004 Scion Xa.
During a routine drive home, I drove over rail road tracks and the car began to accelerate without my foot on the gas pedal. The car continued to accelerate with both feet on the break. I verified that the floor mat was not stuck on the pedal. I placed the car in neutral and the engine was still pegging. I also tried to depress and release the gas pedal several times and that did not stop the acceleration. In order to keep from crashing, I had to keep my feet firmly on the break. This unintended acceleration was occurring for about a quarter mile. I attempted one final cycle of the gas pedal (depress and release) and that finally stopped the acceleration.