As seen in the title. This bug most likely stems from vehicles dropping slightly on the ground upon spawning. The impact makes the suspension spasm out and the car wont move one inch. Upon removing the tires, the car will shake wildly and sometimes take damage. The chassis will aquire a damaged look and parts attached will get ruined.
Mean bug, considering fuel leakage actually kills any vehicle and cannot be counteracted (in Riot terms: a highly toxic and unfun game mechanic).