For Some Detroit Services, Call the D.I.Y. Dept. Detroit may be broke but it will soon have a first-rate motor pool, featuring 23 new ambulances and a fleet of 100 new police cars. Some city parks also are getting tender loving care. New fruit trees and shrubs have been planted, and mowing crews are beginning to make the rounds to keep the green spaces tidy. One of the surprising things about Detroit's descent toward insolvency - so dire that a state-appointed emergency manager recently arrived to take over - is that public services haven't collapsed as completely as some might have expected. But that's not because city departments are functioning as usual. They're not. Instead, a growing collection of volunteers, some affluent, some just average guys riding their Toros, are trying to pick up some services that local government can't provide. Detroit's Department of D.I.Y. is either the most heartwarming or humiliating reflection of its distress, but the volunteers insist it shows their refusal to give up on the place where they live. "When the system fails us, you have to become the system," said Mitch Logan, a 48-year-old film producer who is part of a self-dubbed "Mower Gang" that mows neighborhood parks after they've finished their own yards. In addition to the landscaping, a church group is boarding up vacant houses in the Brightmoor neighborhood, one of the city's most distressed, to keep criminals out. And several neighborhoods are now hiring security to patrol their streets, supplementing an undermanned police department. As for the new cars, "It is unprecedented for us to help buy emergency vehicles or police cars," said Rip Rapson, chief executive of the Kresge Foundation, which joined with Detroit's automakers and other businesses to make the purchase. However, "this was the kind of expenditure they could not find in their budget." Detroit's problems have been a national spectacle for the last several years, the result of the region's long economic slump and of past mismanagement that squandered city resources. By the time emergency manager Kevyn Orr took over city finances in March, local government was $327 million in the red and had gone through rounds of layoffs and cuts. Bus service has been reduced or discontinued on about three dozen routes, leaving thousands of daily riders to find other ways around town. Libraries and recreation centers began closing extra days for employee furloughs and trash trucks were delayed because of breakdowns. Police manpower now numbers 2,600 officers, down from 4,000 a decade ago. The city's parks were in danger of becoming a particular eyesore. Until donors stepped in, the city planned to close almost half of them. Still, mowing on many is scheduled only every three weeks. "It's a disgrace to the nation, a disgrace to the state," said Harriet Cammock, a writer who moved to the suburbs because of the deterioration. Some area residents have begun adapting, though they couldn't come close to filling the huge need. Tom Nardone of suburban Birmingham, owner of an Internet novelty business, started the Mower Gang. Through word-of-mouth, his website and Facebook, the group has grown to more than 20 regulars who take care of eight or nine parks where the weeds were too high for children to play. He hopes to keep expanding.