99 LS400 Shaking Problem
#1
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99 LS400 Shaking Problem
Hey guys I have a 99 LS and when im on the freeway going about 70-80mph the car shakes, its really annoying. It happens when im accelerating but as i let off the gas it stops? anyone got an idea of what the problem might be?
Also when im on the freeway, sometimes the car will feel like a have a flat tire, then it goes away. It usual comes from the rear
Also when im on the freeway, sometimes the car will feel like a have a flat tire, then it goes away. It usual comes from the rear
#2
Lead Lap
One common cause of vibration at highway speeds is bad front strut bar bushings -- you can see the strut bars in front of each front wheel suspension assembly if you get down on your knees and look. I had the ones on my 00 LS400 replaced at 86,600 miles due to the vibration. On my car, the vibration was almost always apparent at about 65-70 mph but was sometimes worse depending on how much the road was crowned and even whether or not there was a strong wind.
Apparently it is less expensive to replace only the bushings if you are doing the work yourself -- the bushings have to be pressed into the bars if I remember what someone on this forum said. Due to the labor rate I was paying at the Lexus dealer, it was less expensive to buy the complete strut bar assemblies.
Apparently it is less expensive to replace only the bushings if you are doing the work yourself -- the bushings have to be pressed into the bars if I remember what someone on this forum said. Due to the labor rate I was paying at the Lexus dealer, it was less expensive to buy the complete strut bar assemblies.
#4
Lexus Champion
While you may well have bushings/strut bar the FIRST thing I would do is make sure your tires are not the problem.
Most of the vibrating shimmying and comming/going steering wheel problems I have had were due to out of balance or out of round tires or a separated carcas. Check those tires.
Most of the vibrating shimmying and comming/going steering wheel problems I have had were due to out of balance or out of round tires or a separated carcas. Check those tires.
#5
True - should have mentioned that first. If your tire shop can do a high speed balance it would be best. Some shops have road force machines where tires are balanced against a hard surface simulating the road versus a free standing balancer. Recently one shop balanced mine but they were still out. Another shop down the road did the same and they were perfect - differences due to calibration.
#7
Lead Lap
True - should have mentioned that first. If your tire shop can do a high speed balance it would be best. Some shops have road force machines where tires are balanced against a hard surface simulating the road versus a free standing balancer. Recently one shop balanced mine but they were still out. Another shop down the road did the same and they were perfect - differences due to calibration.
I finally gave up and took the car to the Lexus dealer. They replaced the strut rods and the vibration was totally gone.
But, for sure, other issues can cause a similar vibration problem.
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#8
my solution
I had a 98 ls400 do the exact same thing ,ended up being the transmission mount ,now it's smoothe as silk !!!! Part was $65.00 from Lexus ,and very simple to install .
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