We have developed a method based on Bethe-Goldstone equation for calculation k- dependent positron-electron enhancement factors. In the method, the electron and positron band structure wavefunctions, densities and energies are used and the e•-e- effective potential depends locally on positron position in a cell. The integral equation is solved approximately by a special linearization and the integration over the first Brillouin zone is carried out using Rath-Freeman tetrahedron scheme. The resulting k-, r- , G-, and band dependent wavefunctions are used to calculate enhancement factors for bee and fee metals. The preliminary results are discussed and compared with ones found experimentally and theoretically by other authors.