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fly_S2K

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  • Lexus Model
    1990 LS400

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  1. Hello all, Well it's happened to me, the dreaded surging idle and stalling engine that often occurs with our early gen Ls400's. I have searched but nothing's actually pointed me in the right direction with my problem. Here are the symptoms. My 1990 LS400 drops to very low RPMs after a few minutes of driving. It will sometimes drop low then surge up to about 2000rpm or flat out stalls. However, this does NOT occur after a long drive or anything, it will happen after 2 mins of driving. Even when I am driving around 40MPH, the car will slow down then start surging or stalls. No matter how much throttle I add, the car will drop RPM's (200-300RPM) then surge upwards or just flat out stalls. It will not allow me to drive. I have spent 2 days searching on this common problem without results, as everyone else's seem a bit different. Such as the 94-95 with the ECM problem or 1st gen's like emyself doing a TB cleaning and MAF cleaning which solves the problem. I've taken a look at my MAF and it looks clean. I'm not sure what to clean on the TB but I do not think that is the problem. I do not think it is the idle control valve because my problem will occur even when im on the freeway doing 60. I want to say it is a bad MAF, but I don't want to go out and buy one without a second opinion. Could someone point me in the right direction? Any input would be greatly appreciated! Thank you.
  2. Thank you for the warm welcome, I'm hoping to gain knowledge as well as pass some of my expriences with the car over the years. After reading a few of the threads, I've noticed that a few of the "quirks" that I exprienced was not just my car but a normal thing for our MY. Hope to learn a lot more form here -johnny
  3. Actually I've been enjoying it since 1990, but just not getting around to buying that service manual :). It's time for some bigger maintence and tune-up procedures and I wanted to venture out and do it for myself. Thanks a lot for your advice.
  4. Thank you, exactly what I was looking for.
  5. Hello all, I am new to this forum and in search of a service manual for the 1990 LS400. I own a Honda S2K and found that the Helm's manual for it is VERY useful and I am curious if there is such for this car. If so where am I able to buy this manual? Any suggestions would be greatly appreciated. Thank you. -Johnny
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