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Lexus Running RoughYour question is not clear. High speed shake rough idle? Does it do both? If an O2 sensor or any other sensor for that matter was bad, you CEL (Check Engine Light) would be illuminated. If you suspect it is due to an engine malfunction and not a suspension issue I would go to Auto Zone and ask them to attach the computer scanner (free) and see if you have any codes. For detailed information go to lexusownersclub.com and post the question. I have been a member there for a long time and that is the Lexus expert website. Tell them vbdenny sent you and I get a gold star.

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My same problem:

I have exactly the same problems with my Lexus but this is a early 97 one. the bad idling is not noticed by the EQ I think as there is no engine light burning. I have read on a forum that someone changed the engine mounts and drive shaft trannys to get rid of the vibrations at higher speeds. Is your one vibrating when pulling or braking on the engine at high speeds? In my case it is only vibrating when I am cruising at a constant speed. I checked mine but could nog see anything particularry there. Still I ll try to change them as they cost only $24 on eBay. Try the O2 sensor tutorial on www.lexls.com . And please let me know when you solved the problem as I have the same problems.

Good luck searching!

Milko

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โˆ™ 2011-09-13 22:57:05
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Q: What could cause a 1991 Lexus LS400 to shake at high speeds rough idle but then go away after 20 minutes and could it be an oxygen sensor bad exhaust lines or bad fuel injectors?
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