ok i got a hpi rs4, and i can get it to start and run but when i try to use the remote control it wont work its like its not getting signal. It worked when i first started to run it, then i crashed it and now it wont work. I checked the freq... thing on the car and its in and the one on the controler is in too... both are am 27 MHz ........anyone have any idea whats wrong and whati need to do to fix this thanks for your help..