Eight months after taking over as chief executive of Ford Motor, Jim Hackett is still trying to accomplish one of his most important tasks: convincing Wall Street that he has a compelling plan to reinvigorate the automaker.

Mr. Hackett, 62, a former chief executive of the office-furniture supplier Steelcase, has taken several shots at it. In October, he and the new team of top executives he selected appeared before financial analysts in New York to outline a plan to cut costs — improve Ford’s “fitness,” in Mr. Hackett’s words — and to accelerate development of trucks, electric cars and self-driving vehicles.

He pressed his case further this month before large audiences at the Consumer Electronics Show in Las Vegas and the Detroit auto show.

But so far investors and analysts remain uninspired. The company’s stock is virtually unchanged since late September, while the Standard & Poor’s 500-stock index has gained 13 percent.