Crew Chief Pete Rondeau stepped down Tuesday after holding the post for just 11 races. Earnhardt hasn't won a Nextel Cup race this year with just three top-five finishes. He is in 11th place in the Nextel Cup standings, 229 points behind leader Jimmie Johnson.
He was third at the season-opening Daytona 500, but has done no better than 15th in the last seven races.
Steve Hmiel will be crew chief on an interim basis. No timetable was announced for a permanent replacement for Rondeau.
"We are capable of consistently winning and are focused on that as a company," said Richie Gilmore, vice president of motorsports for Dale Earnhardt Inc., in a statement Tuesday. "We are going to concentrate our efforts on improved results with the No. 8 car."
Rondeau will continue with DEI in another unnamed capacity.