CanadaCraig Posted March 19, 2006 Share Posted March 19, 2006 Hi Guys!! :) I hope you're OK. Take a look at a photo of MY engine and compare it to your own. Notice the ONE vacuum line below the TRAC box? One the Lexls.com site - the engine in those photos have THREE vacuum lines. Two of the three are 'capped' on my engine. What do those lines do and should I have THREE?! Thanks, Craig!! :) Quote Link to comment Share on other sites More sharing options...
1990LS400 Posted March 19, 2006 Share Posted March 19, 2006 Craig, I suspect that the extra vacuum lines are related to the different emission controls on U.S. models vs. the emission controls on your Canadian-spec LS400. Looking at the sparkplugs tutorial photos on lexls.com I can see see quite a few differences in the engine "plumbing" from your LS. Hey, your engine looks clean enough to use as a dinner plate! Quote Link to comment Share on other sites More sharing options...
obergc Posted March 19, 2006 Share Posted March 19, 2006 My 93 is exactly the same, only one line connected to same port. Quote Link to comment Share on other sites More sharing options...
1990LS400 Posted March 19, 2006 Share Posted March 19, 2006 Well, then maybe it is related to model year since I (think) I remember my previous 1990 LS400 had all three lines instead of just one as on your 93 cars. Here is a link to an engine photo of a 1990 LS400 which also shows three lines instead of one: http://buzztrader.com/showimage.cgi?1271&1..._69_10232_3.jpg Quote Link to comment Share on other sites More sharing options...
Arkansawyer Posted March 20, 2006 Share Posted March 20, 2006 Ditto here on my '93. Two lines capped. Quote Link to comment Share on other sites More sharing options...
j.barleycorn Posted March 20, 2006 Share Posted March 20, 2006 Yep, appears to be model year related, as I know my 1992 has all three in use. My LS400 is outside right now (had the 4runner in the garage overnight after relacing the rear axle seals) so when I swap them out this evening I'll see what the exact deal is, but I believe the extra two lines run from the EGR valve/vacuum modulator and the VSV. Sounds like there was a change to the EGR system beginning in 1993... Quote Link to comment Share on other sites More sharing options...
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