A lokacin da yake Washington DC ne Adamowicz ya fara tseren mota. Ya fara tsere da Volvo PV 544 a makwabciyar Maryland a 1963. Daga baya ya yi takara a cikin rukunin Under 2-Liter na 1968 Trans-Am Championship a cikin Porsche 911, sannan ya yi tsere a cikin Can-Am Series da &lt;a href="Formula%205000"&gt;Formula A/Formula 5000&lt;/a&gt;, ya lashe gasar SCCA Continental Championship ta 1969. Ya sami damar yin tsere a cikin
1970 Indianapolis 500, amma a lokacin da yake zagaye na farko na gwajinsa na cancanta a cikin Eagle-Offy an nuna hasken rawaya kuma Adamowicz ya rage. Koyaya, rawaya kuskure ne kuma an umarci Adamowicz ya ci gaba da sauran zagaye 3. Zagaye na farko, ya fi sauran jinkirinsa, ya jawo matsakaicin sa zuwa inda aka buga shi daga filin. Ya shiga wata mota amma ya fadi a cikin horo kafin ya sami damar sake cancanta.