2000 LS400 smoked for a short duration while on the freeway - ClubLexus - Lexus Forum Discussion

LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

2000 LS400 smoked for a short duration while on the freeway

Thread Tools Search this Thread
Old 06-16-14, 06:20 PM   #1
Lead Lap
Thread Starter
iTrader: (2)
SuicidnS13's Avatar
Join Date: Jul 2009
Location: NV
Posts: 537
Thanks: 0
Thanked 0 Times in 0 Posts
Default 2000 LS400 smoked for a short duration while on the freeway

So I just drove from Las Vegas to San Diego with no issues. Then on my drive home almost at the last incline before the drop into Nevada I notice whitish/greyish smoke coming from my cars exhaust under load. I immediately slowed down and got over to the slow/semi truck lane until we finally made the decent part. As soon as we hit the downhill part no more smoke at all. Pulled into a rest stop to check out the car. No leaks, no CEL lights, no odd sounds, no loss of power nothing. The cars oil is roughly only 1500 miles or so old. Started her back up and not one more sign of smoke. I did just have to pass a car and honestly got it up to 120mph in all fun but that was like a half hour or so before anything had happened. I had my cruise control set to 80mph. Heck it was barely 85* out so it wasn't like the car was even struggling. On my trunk and rear bumper looks like unburned fuel or oil smoke (reminds me of when a turbo is kinda burning oil or running rich)

Drove her to work today and still nothing. Gonna drain her oil this weekend and check it out. Have you guys ever experienced this before? Crank case full? EGR possibly? My car has had all basic maintenance done including timing belt, gaskets etc. Any idea what would cause this on the vvti v8?
SuicidnS13 is offline   Reply With Quote
Old 06-16-14, 06:58 PM   #2
Lexus Champion
Join Date: Aug 2011
Location: Japan
Posts: 1,780
Thanked 45 Times in 36 Posts

Your car doesn't have any EGR pipe. It's done by the valve timing control.
I would check spark plugs first. A friend of mine once had a bit similar problem with you but it was a German car though. It smoked badly when running a circuit and it continued to smoke some after that. One of spark plugs was clogged much more than others. The problem was caused by a damaged oil ring used for the piston we finally found. I hope yours is not as serious as that.
Yamae is offline   Reply With Quote
Old 06-16-14, 07:50 PM   #3
Lexus Champion
iTrader: (31)
xspsi6's Avatar
Join Date: Jul 2007
Location: Leesburg FL
Posts: 2,773
Thanks: 0
Thanked 0 Times in 0 Posts

Check the power steering fluid level to make sure it's not getting sucked through the intake as they are known to do and check your pcv system as well.
xspsi6 is offline   Reply With Quote
Old 06-17-14, 01:45 PM   #4
Lexus Champion
iTrader: (5)
timmy0tool's Avatar
Join Date: Sep 2008
Location: 909/626/714, SoCal
Posts: 3,928
Thanked 17 Times in 16 Posts

120mph runs do strain your engine. surprised you are willing to go that fast with your suspension and wheel setup. *****!

i too would check your PCV system as well as the power steering.
timmy0tool is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
to kill a 4.0L Jeep straight six. Stereorob Car Chat 18 02-09-17 02:38 PM
1995 ls400 idle issue/smoke/confusion Suprjdmbro LS - 1st and 2nd Gen (1990-2000) 6 12-04-15 05:40 PM
Car takes 7-8 secs to turn over then pours smoke and gas smell out exhaust? 600hpM3 IS - 1st Gen (2001-2005) 3 03-05-15 08:41 PM
Help car blows alot of smoke! GSRSRT GS - 2nd Gen (1998-2005) 55 01-09-11 03:44 PM
Tell me what you think about this repair? xis RX - 2nd Gen (2004-2009) 11 09-05-09 01:30 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT -7. The time now is 02:50 AM.

Copyright © 2000-2017 Internet Brands, Inc. All Rights Reserved
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: