The gas phase infrared spectrum of monoisotopic H 3 Si 37 Cl has been reinvestigated in the ν 1 /ν 4 region near 2200cm −1 , using a Fourier transform spectrometer, with a nominal resolution of 0.0027cm −1 . The rovibrational analysis confirms, besides the weak Coriolis x, y resonance between the (v 1 =1) and (v 4 =1) levels, the existence of two strong local perturbations in the ν 4 band. These are caused by rotational (Δk=Δl=±1) type resonances with ν3+ν5±1+ν6∓1 and ν3+ν5∓1+ν6∓1, respectively. Another local perturbation of the 12⩽KΔK⩽14 subbands of the ν 4 band, probably due to a (Δk=Δl=±1) interaction with ν2+2ν60, was detected and analyzed. All these local perturbations have been studied individually using a simple model of two interacting sublevels. Without the transitions involved in the local perturbations, more than 2000 lines of the ν 1 /ν 4 band system were used to obtain a complete set of vibration–rotation parameters set for the v 1 =1 and v 4 =1 states. By means of a band contour simulation, both the transition moment ratio ∣M 4 :M 1 ∣=1.25 and a positive sign of the Coriolis intensity perturbation were determined.The present results, together with the accurate existing data for ν 2 , ν 3 , ν 5 , and ν 6 bands, allowed us to derive the experimental values, A e =2.8722945(37) cm −1 and B e =0.2182248(22)cm −1 , which are compared with those of ab initio calculations.