Internal combustion engine equipped with a fuel injection control method and an exhaust gas recirculation (1), wherein an injection time of at least one injection valve is changed, for at least two different injection durations each an oxygen proportion (ortho2, exh ) of the exhaust gas measured and therefrom a spent oxygen content (F.exh, meas ) of the exhaust gas is determined, each a spent oxygen content (F.exh, est1, f isexh, est2 ) of the exhaust gas is estimated, as a function of the differences (F.exh, meas - f isexh, est1 , and fexh, meas - f isexh, est2 ) between the respective based on the measured oxygen content (ortho2, exh ) determined and the respective estimated optimum injection time spent oxygen content (T isoption ) is determined and the at least one fuel injector with a of the optimum injection time (T isoption ) dependent adjusted injection time is controlled.