In this paper, a Fault Detection (FD) problem for a class of Nonlinear Networked Control Systems (NNCS) in a set-membership framework is investigated. Under the assumption of bounded network-induced delays and process uncertainties (i.e. process disturbances and measurement noises), a residual generator is constructed based on a set-membership estimation-based predictor approach. Finally, a numerical example illustrating the performances of the proposed method is given.