Question about Lexus LS 400

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Smoke from exhaust when start ls400 model1991 lexus color of smoke is gray it ends few second

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The smoke is from engine oil, it is caused by leaking valve seals , after the engine is shut down for the day oil is leaking past the valve seals and getting into the cylinders then when you start up the engine the oil is burned off, this is a common problem, and there is a couple of things you can do to help the problem with out taking the engine apart and replacing the seals, try this first at your next oil change add some Restore to the engine oil it will soften the seals and give them a little more life, if this does not cure the problem after a few 100 miles then you will need to have the seals replaced, and this is a costly repair, but you could just live with the smoke it wont hurt any thing just keep an eye on the oil.

Posted on May 17, 2011

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Sounds like its your valve seals/stems. You need to have them replaced. Hope this helps, James Booth

Posted on May 17, 2011

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1 Answer

Smoke from exhaust when start ls400 model1991 lexus


That sounds like either your valve seals/stems. What color is the smoke? Are you sure its not just steam? Does it disappear after a couple of seconds? Please reply

May 17, 2011 | 1991 Lexus LS 400

1 Answer

I had a new water pump and timing belt put on my 1991 lexus ls400, but i see white smoke coming from the tailpipe and when i put coolant in the reserve tank it leaks out but not on the ground. Can someone...


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Smoke is a sign of engine burning oil, which is caused by faulty piston rings, in most cases it's cheaper to have another engine installed in the car, instead of having work done on pistons. Hope this helps and please rate the answer if it was helpful, it helps me, thanks! P.S. Comment if you need more advice, it'll be my pleasure to assist you.

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check power steering levels i have the same year Gen I-III have a power steering defect PS fluid pumps into system then out tail pipe, white smoke.Lexus fixed this in later models.. check lexls.com the solution is there.

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Dec 24, 2009 | 1992 Lexus Ls 400

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My 1991 Lexus LS400 is beginning to have a smoking problem. Whenever I start the car (whether cold or hot) it will emit smoke (small cloud, but getting larger) from the rear mufflers. (smoke smells like...


depending on the color of the smoke,but try a few gas treatments.after ur next fill up,but a gas treatment n fuel tank&take her on the interstate and open it up(drive fast within speed limit lol).

Nov 09, 2009 | 1991 Lexus LS 400

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Not too bad. Not much room, just enough to drop the starter. It is probably easier to go up through exhaust if you can get your exhaust shield off the manifold .

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