I went to get a emissions test done on my 1992 Ford Explorer XLT today and everything passed except for the ERG Valve. the guy said i needed to clean the EGR Valve but i have no idea where it is located or how to do it. I have looked all over the web to try and find out how to clean it but then i found this: http://wiki.answers.com/Q/Where_is_the_EGR_valve_located_on_a_1994_and_later_Ford_Explorer and it says that all Ford explorers before 1994 have no ERG Valve. Can anyone help me?? Thanks!