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We study a $p$-Laplacian equation involving a parameter $\lambda$ and aconcave-convex nonlinearity containing a weight which can change sign. By usingthe Nehari manifold and the fibering method, we show the existence of twopositive solutions on some interval $(0,\lambda^*+\varepsilon)$, where$\lambda^*$ can be characterized variationally. We also study the asymptoticbehavior of solutions when $\lambda\downarrow 0$.

Local minimizers over the Nehari manifold for a class of concave-convex problems with sign changing nonlinearity