soda Posted February 6, 2011 Share Posted February 6, 2011 Recently replced engine in 990 LS400. Runs great but notice alot of moisture out of the exhaust and after replacing on knock sensor I am getting trouble codes 52 and 55. Any help would be greatly appreciated. Quote Link to comment Share on other sites More sharing options...
curiousB Posted February 6, 2011 Share Posted February 6, 2011 Is coolant staying full? Sounds like a blown head gasket leaking coolant into cylinder and coming out exhaust. If coolant not leaking down then this isn't the problem so easy to check. Quote Link to comment Share on other sites More sharing options...
soda Posted February 8, 2011 Author Share Posted February 8, 2011 Is coolant staying full? Sounds like a blown head gasket leaking coolant into cylinder and coming out exhaust. If coolant not leaking down then this isn't the problem so easy to check. Thankyou for the reply. The coolant level is normal, oil is coolant free and compression is ideal on every cylinder. Quote Link to comment Share on other sites More sharing options...
curiousB Posted February 8, 2011 Share Posted February 8, 2011 Maybe a failed ACV valve in your power steering pump. When if goes it allows power steering fluid to leak into the intake manifold. When it burns creates white smoke. Many posts here about how to fix this. Quote Link to comment Share on other sites More sharing options...
soda Posted February 11, 2011 Author Share Posted February 11, 2011 Apreciate the input Quote Link to comment Share on other sites More sharing options...
soda Posted February 21, 2011 Author Share Posted February 21, 2011 Just replaced both knock sensors, still getting codes52,55 . Anyone have any ideas? Most appreciated Quote Link to comment Share on other sites More sharing options...
curiousB Posted February 21, 2011 Share Posted February 21, 2011 Just replaced both knock sensors, still getting codes52,55 . Anyone have any ideas? Most appreciated Bad tank of fuel? go to different place and get a fresh tank of premium? Then disconnect battery for a bit to clear codes and see how quickly the 52/55 duo returns. Quote Link to comment Share on other sites More sharing options...
soda Posted February 22, 2011 Author Share Posted February 22, 2011 COdes return after around 2,000 rpms. The did sit for four years. I pumped the tank out and replaced fuel twice along with fuel. After reading and searching I'm thinkg tune up, temp registration, and a few hot laps. Don't know. I'm stummed. Again, thanks Quote Link to comment Share on other sites More sharing options...
lexlslove Posted February 25, 2011 Share Posted February 25, 2011 This sounds identical to a problem I am having. I heard a "pop" and suddenly had no acceleration. I could not find anything on a acv valve. Could someone help me find some posts on here. Thanks. Quote Link to comment Share on other sites More sharing options...
curiousB Posted February 25, 2011 Share Posted February 25, 2011 Could someone help me find some posts on here. Thanks. http://us.lexusownersclub.com/forums/index.php?showtopic=6583 http://us.lexusownersclub.com/forums/index.php?showtopic=62816&st=0&p=402651&hl=+power%20+steering%20+pump%20+valve&fromsearch=1entry402651 http://www.lexls.com/tutorials/steering/ Quote Link to comment Share on other sites More sharing options...
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