IELTS CEFR MULTILEVEL TOEFL TKT

He had the habit of buying ice cream every day to share with his family, hardly changing the flavor of said dessert. The funny thing is that whenever I bought Vanilla ice cream the vehicle did not work, while if I bought another flavor it had no problems.
The claim was so curious that even the division president received a copy and decided to act on it. He sent an engineer to interview and make sure of the problem the car was having.
Once at the client's house, the engineer asked him to go buy vanilla ice cream as he used to do every night and thus verify what was happening. Once they bought the ice cream, the car did not really work.
The next day another General Motors employee visited the customer and they made the same tour to buy ice cream, but this time they changed the flavor, to the employee's surprise, the car was working normally.
The problem ended up becoming an obsession for the engineer, who ended up performing daily experiments, writing down all the possible details. After two weeks, he arrived at the first great discovery: when vanilla was chosen, the buyer was served the ice cream in less time because that flavor of ice cream was in front of the counter. Upon examining the vehicle, the engineer made a new discovery: As the purchase time was very short if vanilla flavor was chosen, compared to the purchase time for other flavors, the engine did not cool down. Thus, the fuel vapors did not dissipate, preventing the engine from starting instantly.
From that episode, the Pontiac changed the fuel supply system and introduced a modification in all its models from 1999.
The complainant obtained a new car, in addition to the arrangement that did not work with vanilla ice cream.
GM released an internal statement, demanding that its employees take even the strangest claims seriously.