A method for detection of torque deviations of an engine in a vehicle, comprising: - a measurement of actual measured values D act related to a behaviour of at least one parameter which is related to an actual torque M eng_act delivered by said engine in consequence of a torque M eng_req demanded from said engine; - a comparison of said actual measured values D act related to said behaviour of said at least one parameter with previously determined measured values D ref of correspondingly at least one respective parameter related to said actual torque M eng_act, said previously determined measured values D ref having been determined during normal operation of said vehicle; - a detection of whether said actual torque M eng_act deviates from said demanded torque M eng_req, said detection being based on said comparison; and the method is characterised by: - controlling at least one system of the vehicle based on the detection, in which method said at least one parameter which is related to an actual torque M eng_act comprises a speed ω of said engine, in which method: - said previously determined measured values D ref will have been determined at loads N ref and speeds ω ref of said engine during normal operation of said vehicle; - said measurement of said behaviour of at least one parameter comprises measurement of an actual amplitude variation ΔA act of an actual speed ω act of said engine; and - said comparison comprises a comparison of said actual amplitude variation ΔA act and said previously determined measured values D ref of said engine speed ω ref. - a measurement of actual measured values D act related to a behaviour of at least one parameter which is related to an actual torque M eng_act delivered by said engine in consequence of a torque M eng_req demanded from said engine; - a comparison of said actual measured values D act related to said behaviour of said at least one parameter with previously determined measured values D ref of correspondingly at least one respective parameter related to said actual torque M eng_act, said previously determined measured values D ref having been determined during normal operation of said vehicle; - a detection of whether said actual torque M eng_act deviates from said demanded torque M eng_req, said detection being based on said comparison; and the method is characterised by: - controlling at least one system of the vehicle based on the detection, in which method said at least one parameter which is related to an actual torque M eng_act comprises a speed ω of said engine, in which method: - said previously determined measured values D ref will have been determined at loads N ref and speeds ω ref of said engine during normal operation of said vehicle; - said measurement of said behaviour of at least one parameter comprises measurement of an actual amplitude variation ΔA act of an actual speed ω act of said engine; and - said comparison comprises a comparison of said actual amplitude variation ΔA act and said previously determined measured values D ref of said engine speed ω ref. in which method said at least one parameter which is related to an actual torque M eng_act comprises a speed ω of said engine, in which method: - said previously determined measured values D ref will have been determined at loads N ref and speeds ω ref of said engine during normal operation of said vehicle; - said measurement of said behaviour of at least one parameter comprises measurement of an actual amplitude variation ΔA act of an actual speed ω act of said engine; and - said comparison comprises a comparison of said actual amplitude variation ΔA act and said previously determined measured values D ref of said engine speed ω ref. - said previously determined measured values D ref will have been determined at loads N ref and speeds ω ref of said engine during normal operation of said vehicle; - said measurement of said behaviour of at least one parameter comprises measurement of an actual amplitude variation ΔA act of an actual speed ω act of said engine; and - said comparison comprises a comparison of said actual amplitude variation ΔA act and said previously determined measured values D ref of said engine speed ω ref.