Hi folks.

Bit of a story to tell.

I got myself an RX300 2004 that needed some work on the suspension.

I ended up changing the suspension ECU, refurbished the height sensors and replacing 3 out of the 4 struts which were all leaking.

All has been good for about a year.......... then........... I find the front is no longer keeping it's height. So investigation starts.

I thought the FL strut was leaking as it would loose height quickly, soon followed by the right one.

Before I ordered a replacement I blocked off the airline to the left strut and monitored the right strut to see if it would loose height.

Unfortunately it did, which leads me to think it can't be the left strut, but must be a valve that lets air out the system or something similar.

Throughout all this the rear never lowers but keeps it's height.

I thought ECU but it looses height when there is no power applied (Ignition off).

Has anyone experienced this or have an idea?

 

Click bait title lol
I thought I was going to see a bagged and lowered RX330. haha
Plz check out some of the recent threads, there was a member on here recently that did an air suspension delete and he has extra struts and/or may be able to help you with your problem.

 

Thanks for the input.
I think I've narrowed it down to the height control valve.
I found with the LF air pipe sealed of, the right side also lowers.
The only think common to both, that would cause both to lower, is the valve............ I think....... I hope.

 

You may be on to something.
Looks like left and right valve selenoid is built into a combo style "all-in-one" unit.

 

Thanks Margate330. That drawing gives me some confidence I’m on the right track. Also helps with location.
Cheers

 

I'm no expert on the air bag suspension so plz post up your fix for us when you figure it out.
Pics are awesome when you get up in there if you can take some cuz as you can see the drawing above is not that good or much to go on.

 

Will do

 

So where am I with this suspension?
I decided to have a look at the front suspension valve.
Accessing this is a bit of a job. DON'T follow Lexus's workshop manual to gain access. They tell you to remove the wing valance. (The bit round the wheel)
All you need to remove is the front bumper. To do this it's all popers and screws, with only one each side being difficult to get to. Easily once you pull the the plastic back slightly.

Where the screw attaches to the wing. You can see the plastic you need to pull back to get at the screw when the bumper is still on. My finger is on it.

So now all is revealed it's easy to gain access to where any air leak can hide.

This picture shows the front height valve with it's connections, which are possible leaks points.


A joint on the right side.


Another joint on the left side.


I hope this helps anyone looking for potential leak points.

Unfortunately for me, all this work didn't resolve my issue. I'm still searching for my leak.

 

Would soaking the parts with soapy water find a leak?

 

Margate330 that’s what I do.
First thing you do is nick one of your wife’s spray bottles, fill it with soapy water and on you go. I also use a soapy sponge on the end of a stick for where I can’t spray.
As said though, nowt is showing a leak.

My next step is to remove the suspect strut then pressurise it and test it for a leak.

I’ll post updates when I can.