sorry im new to this game but I love it so much! this game may help me for my studies for being a mechanic i buy the full version and happy about it but one thing i dont understand, everytime i finish my car i want to put it on the test drive but everytime i press the START button it wont start and nothing is happening what should i do Mr.Developer 
thanks in advance
This may be a case of you tires being blown, which there isn’t any warning message for yet. Try using a lower profile and wider tire.