I have only seen the ABIDE data distributed as NIfTI images, not DICOM images. If you do have the DICOM images, can you check the BIDS format JSON file created by dcm2niix for the "SliceTiming" tag. If it is not present, please upload it. If you do not have the DICOM images, and only the NIfTI images, you are asking the wrong forum, as dcm2niix if for DICOM to NIfTI conversion. Please contact the apprpropriate forum. I note that fcon_1000 lists they are the parent project for ABIDE
  https://www.nitrc.org/projects/fcon_1000