Slightly off the subject Before ODB II ( about 1996 I guess ) there were proprietary diagnostic schemes. Is there anyplace to find out information about these ? In particular, Ford Explorer 1991 Thanks AGSC Augustus Gustavius Salvatore Calabrese 720.222.1309 AGSC www.omegadogs.com Denver, CO cell 303 908 7716 If SPAM filters bounce mail, try ags.calabrese@hotmail.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist