hey guys.. i hav a 90 model ls400 and im having air suspension problems, the front left (passenger) side of the car is not pumping up... the pump seems to b going and trying to fill it up with air but it doesnt go up... then it starts to move, raises about an inch.. then all of a sudden just drops again... i dont no if its a bag problem or air line.. or maybe even the valve.. any1 who knows about this or had any of the same problems it would be great 4 any help.

 

Need to listen for the leak and use water and soap to find it.

 

Is it the original Air Bag? If so, replace it and get ready for the other three to follow.

My 92 has new rear and a new front...just waiting for the other two....

 

but how do i know if it is the airbag?... i mean, could it be the air line?.. or the valve on the compressor not closing properly?..

 

The stock air bags will stay filled with air once they are filled up. The air line has two O-Rings that keep it from leaking while it is filling up. There is also two O-Rings at the pump.

Mine had the same thing. Was driving one day and bam, it dropped and never came back up. Is yours just one side? If you put it in "High" mode, will the others lift?

To get to the air pump you will need to remove the plastic wheel well on the passenger side, but I'd be willing to bet your air bag is shot.

 

Have you installed your new height controller?

 

Generally it's not the airbag itself that goes , it's the rubber seal at the top of the strut that goes , if you take the top hat off on top of the strut tower , remove the motor drives and the bracket you will be able to see , don't be surprised if the rubber ring you can see through the top of the tower is cracked or chunking .
What happens is the shock absorber part goes and then it hammers out that top piece of rubber over time .

 

thats exactly what happened.... just replaced it... now for some reason it pumps up.. but air is leaking.. whats the best stuff to seal the air line so it wont leak?.. it pumps up then starts to go down...

 

get teflon tape ls400 boy..

 

I had the same problem. Does your air hose have a little piece that sticks out that has two o-rings on it?

Make sure because I broke mine off and didn't know it and is caused my ride to lower everytime I turned the car off. I could also hear it leaking....

 

If you need new air struts, check out the following: http://www.suncoreindustries.com/lexuspage.asp. Be sure and scroll down past the conversion units for their air units! Those prices beat the hell out of Lexus prices and carry a lifetime warranty! I suppose it means the car's lifetime! Good luck.