jefftreece Posted August 8, 2005 Share Posted August 8, 2005 my engine check light and trac light are on I pulled the code and it is a 71 egr malfuntion. I have been doing searches and have not found any thing to solve the problem hope some body out there has some ideas on where to start. my car is a 91 ls400 with 153000 miles on it, the car runs the same with or without the lights on they do occasionly turn off . thanks Quote Link to comment Share on other sites More sharing options...
92ls forhundo Posted August 9, 2005 Share Posted August 9, 2005 Hello Jeff, I have a 92 with 240,ish and i recently had that exeact same problem. I took the car to a trusted mechanic and it was solved by the replacement of " mushroom valve" . The offending valve is located on the driver side of the intake manifold. In my case my "mushroom" valve was just frozen with carbon. My mechanic said the part was about $45. no performance lost when it was bad but i wpould assume that it might cause failure when smogging the vehicle. Quote Link to comment Share on other sites More sharing options...
jefftreece Posted August 9, 2005 Author Share Posted August 9, 2005 thank you for the info I will look into that. Quote Link to comment Share on other sites More sharing options...
jefftreece Posted August 10, 2005 Author Share Posted August 10, 2005 anybody else have any ideas not exactly sure where the mushroom valve is? thanks Quote Link to comment Share on other sites More sharing options...
92ls forhundo Posted August 11, 2005 Share Posted August 11, 2005 sorry for the bad description the right name is the "egr vacuum modulator". When you open the hood and you see the lexus logo on the manifold, on the right hand side you'll see too round valve-looking thingies(dont know how else to say it) with a bunch of hoses and such coming out of them, The one in the back is the egr valve and the one in the front is the "mushroom" valve, sorry for flaky description thats how a mechanic described it to me. Cheers. Quote Link to comment Share on other sites More sharing options...
jefftreece Posted August 12, 2005 Author Share Posted August 12, 2005 thank you so much for the clarifacation. everybody here is so great. thanks Quote Link to comment Share on other sites More sharing options...
tds Posted September 20, 2005 Share Posted September 20, 2005 I just fixed this on my 91LS400. It is called a Vacuum Modulator Valve and is part # 25870-50010 (part is around $150.00 CDN) Quote Link to comment Share on other sites More sharing options...
pkshin Posted December 30, 2005 Share Posted December 30, 2005 I just fixed this on my 91LS400. It is called a Vacuum Modulator Valve and is part # 25870-50010 (part is around $150.00 CDN) [] Hi tds, My 91 ls400 has same problem, code 71. Did you have the code 71 and it is cleared after fix? Any symptom you could feel while driving with the code 71? I think the vacuum modulator filter can be easily cleaned by dusting off. Thanks, pks Quote Link to comment Share on other sites More sharing options...
92ls forhundo Posted January 2, 2006 Share Posted January 2, 2006 I just fixed this on my 91LS400. It is called a Vacuum Modulator Valve and is part # 25870-50010 (part is around $150.00 CDN) [] Hi tds, My 91 ls400 has same problem, code 71. Did you have the code 71 and it is cleared after fix? Any symptom you could feel while driving with the code 71? I think the vacuum modulator filter can be easily cleaned by dusting off. Thanks, pks [/quote yeah after this was replaced the cel was gone and hasnt come back since. The part was about $50 here in so.cal. Quote Link to comment Share on other sites More sharing options...
j.barleycorn Posted January 5, 2006 Share Posted January 5, 2006 Everything you ever wanted to know about code 71 (from the 1992 LS400 manual) trouble shooting section... dtc71.pdf Cheers! Quote Link to comment Share on other sites More sharing options...
myf16 Posted November 1, 2023 Share Posted November 1, 2023 My 1990 LS400 with 160k miles gave an Error 71. I can't find the source anymore, but someone online suggested replacing the clogged filter material under the EGR modulator plastic cap (pry it off) with a piece of this $2 Autozone material: duralast-breather-filter-cf4500dl. A 5-minute fix. I think it's working. No more error code. Quote Link to comment Share on other sites More sharing options...
myf16 Posted November 8, 2023 Share Posted November 8, 2023 My 1990 LS400 with 160k miles gave an Error 71. I can't find the source anymore, but someone online suggested replacing the clogged filter material under the EGR modulator plastic cap (pry it off) with a piece of this $2 Autozone material: duralast-breather-filter-cf4500dl. A 5-minute fix. I think it's working. No more error code. Edited to add: The error code came back! More diagnosis needed. Quote Link to comment Share on other sites More sharing options...
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