Mako1 Posted March 28, 2016 Share Posted March 28, 2016 Hello all, Long time lurker, first time poster with my 1991 LS400. Sorry for the NOOB question, but I'm trying to locate my VSV and I'm unclear where it is--and are there actually two? Can anyone post a pic of an engine bay of a 1991 1UZ and show the VSV(s)? Thank you! Hope to add more, better content as I get more experience with this car, which I'm doing PM after buying it. Thanks! Quote Link to comment Share on other sites More sharing options...
chc0318 Posted March 28, 2016 Share Posted March 28, 2016 Hope this help. https://www.google.com/search?q=1993+Lexus+LS400+VSV&tbm=isch&imgil=9a6Ev1aJDkco3M%253A%253BQH_i6ksX3Hw0_M%253Bhttp%25253A%25252F%25252Fwww.clublexus.com%25252Fforums%25252Fperformance-and-maintenance%25252F664516-vsv-bypassing-heating-blows-cold.html&source=iu&pf=m&fir=9a6Ev1aJDkco3M%253A%252CQH_i6ksX3Hw0_M%252C_&usg=__bnwjraEcHb3I5Z6AbU8fFGBf8uI%3D&biw=1440&bih=726&ved=0ahUKEwjR076Qo-TLAhXNuB4KHaFuB8wQyjcIJg&ei=Tpv5VtH0Ms3xeqHdneAM#tbm=isch&tbs=rimg%3ACfWuhL9WiQ5HIjiRP2djLZJHFJ0U8clSU6wBSh-AnqgHZVgIWNNGZ-rh3d38FQWcZMEjvExAa3691bPT4Ssmt3wyiyoSCZE_1Z2MtkkcUEa4eSnIaA7UOKhIJnRTxyVJTrAERM3fw9yk8x1wqEglKH4CeqAdlWBGHK2VA0WSSnyoSCQhY00Zn6uHdEVOKxTTI3ipcKhIJ3fwVBZxkwSMRk3bwpw5w8VcqEgm8TEBrfr3VsxFg_1RI_1QxDNTyoSCdPhKya3fDKLEbnPJyXJy5cU&q=1993%20Lexus%20LS400%20VSV&imgrc=tWf04s6N_sdwzM%3A Quote Link to comment Share on other sites More sharing options...
Mako1 Posted March 28, 2016 Author Share Posted March 28, 2016 Thanks CHC! Part of the situation is when I called the stealership, they couldn't tell if VSV 90925-03190, of which there are two, is what I'm looking for, or VCV Vacuum Control Valve 89470-50011/50020 is it. I'm looking for the EGR VSV. Quote Link to comment Share on other sites More sharing options...
Exhaustgases Posted March 29, 2016 Share Posted March 29, 2016 At the top of the egr valve unit there is a diaphragm with a port and a small hose follow it, it goes to the vsv. No volts on the vsv connects ports E to F and would open the egr. With 12v it then connects port E to the filter and that would close the egr. Sometimes there is carbon build up in the larger bottom hose at some where in it that goes the egr modulator that is the thing that has 3 small hoses on it and ports labeled P R Q at the top and one larger hose at the bottom. Quote Link to comment Share on other sites More sharing options...
Mako1 Posted April 4, 2016 Author Share Posted April 4, 2016 Does anyone have a Lexus part # for a 1991 LS400 VSV? Quote Link to comment Share on other sites More sharing options...
Exhaustgases Posted April 6, 2016 Share Posted April 6, 2016 http://www.lexussouthatlantaparts.com/showAssembly.aspx?ukey_assembly=795408&ukey_make=1082&ukey_model=15669&modelYear=1991&ukey_category=21750&ukey_trimLevel=19107 scroll down to 17650 Quote Quote Link to comment Share on other sites More sharing options...
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