The Federal Reserve took aim at the nation’s wobbly housing market last week with its biggest stimulus action in two years, but that firepower is doing little to lower mortgage rates or make home loans more available for Americans, the Washington Post reported today. Instead, banks are set to see a windfall since the Fed’s actions will immediately lower the cost of issuing loans. It may take months or longer for benefits to trickle down to consumers, analysts say. The emerging scenario highlights the limitations of the Fed’s ability to jump-start the housing market on demand: Rather than intervene directly with consumers, the Fed must rely on banks, brokers and other industry actors to offer borrowers better terms. Banks say that they are keeping rates high right now because lowering them any further would overwhelm them with customers. They say that over time, as volume thins out, rates could come down to attract new borrowers. Critics argue that banks are simply maximizing profits at the expense of consumers. Mortgage bankers are recording higher gains from home loans as the gap widens between the interest rate they charge consumers and the rate they must pay investors who finance the loans by buying mortgage securities.