The Detroit auto makers managed to increase their new-vehicle quality scores by an average of 10% this year despite being rocked by bankruptcies and a worldwide economic recession.

Ford Motor Co. (F), General Motors Corp. (GMGMQ) and Chrysler LLC reduced the number of troubles reported by consumers during their first 90 days of ownership, according to the annual J.D. Power & Associates Initial Quality study. Toyota Motor Corp. (TM) led all the auto makers with its Lexus brand finishing in the top spot, while BMW AG's (BMW.XE) Mini was last.

The results, released Monday, come at a time when quality and brand image are under intense pressure as auto makers are forced to make deep worker cuts and idle factories that can lead to a variety of production problems.

The quality gap between the foreign imports and the Detroit auto makers is now the smallest it has ever been, David Sargent, J.D. Power's vice president of automotive research, said during a speech at the Automotive Press Association in Detroit. The domestics lagged the foreign auto makers by six points.

"Domestic and import initial quality is equal for cars and the domestics have a slight edge for trucks," Sargent said during a speech in Detroit Monday. "Imports have a significant edge for crossovers."

Sargent said there was no evidence in the data to show that consumers were affected by the GM and Chrysler bankruptcies.

"It appears there has been a positive disconnect between the turbulence and those who come in and build or design vehicles," Sargent said. "If anything, they are intensifying their focus on quality."

The biggest surprise was Chrysler. The auto maker's iconic Jeep brand, which finished last in quality in 2008, climbed four spots in the rankings. The Jeep brand had 137 problems per 100 vehicles - 29 fewer than last year. The industry average was 108 problems per 100 vehicles.

Problems can range from wind noise to transmission failure. Brands that do well - typically luxury cars top the list - can use the results to bolster advertising campaigns. The vehicles were evaluated between November through February.

Chrysler, which filed for bankruptcy April 30 and merged its assets with Fiat SpA (FIATY), undertook a massive overhaul of its brands in 2008. Many of the vehicles were outfitted with new technologies and redesigned to focus on consumer comfort. The company made about 500 changes on its products last year.

"Jeep had improvements across the board," Sargent said. "All of their models improved from engine and transmission to outside design."

Toyota's Lexus brand beat out Porsche with 84 problems while Porsche had 90. Porsche had the top spot for the past two years. GM's Cadillac finished in third with 91 problems followed by Hyundai Motor Co. Ltd. (HYMLY) at 95 and Honda Motor Co. Ltd. (HMC) at 99 problems.

Ford's Mercury and Ford nameplates scored above average but the Lincoln brand finished in 27th place with 129 problems. Lincoln finished 15th last year. Volvo, which Ford is trying to sell, was 24th.

A company spokeswoman attributed Lincoln's decline to some of the interior technology, such as navigation systems, that may have taken consumers longer to learn.

Ford, which has sidestepped the need for federal aid, is relying on its new product introductions to drive consumer purchases. The auto maker is still losing billions of dollars. GM and Chrysler both took federal aid late last year to continue operating during the economic downturn.

GM's vehicles were all over the board. Chevrolet finished in ninth place with 103 problems but its GMC and Buick were in 18th and 19th, respectively. Buick, with its 117 problems, tied with the industry average last year.

Saturn, Saab and Hummer all finished well below the industry average. Saab was the lowest ranking nameplate with 138 problems.

GM is in the process of selling off Saturn, Hummer and Saab as part of its bankruptcy reorganization. It also plans to close its Pontiac brand, which finished in 22nd place with 118 problems.

BMW's Mini finished last with 165 problems.

-By Jeff Bennett, Dow Jones Newswires; 248-204-5542; jeff.bennett@dowjones.com