LX470 suspensions lowers after off

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Joined
Feb 3, 2025
Threads
10
Messages
47
Location
illinois
Yet another AHC question.

After I turn my 99 lx470 off, the suspension slowly Lowers over a couple hours. After overnight parking, it seems like it’s on the bump stocks. It’s done this since I’ve had it, I’ve kind of written it off as a quirk. But I’m also having no luck finding anyone else with this issue. So here I am.

I have replaced within the last 3 months
- new AHC Pump
- 4 new accumulators
- brand new AHC Fluid
- bled the system for air bubbles
- and adjusted my torsion bar into spec

The truck rides great, there is no fluid leakage when parked, and whenever I fire up the engine the car immediately rises back into N.

There was ONE occasion this past month that I walked out to my car and was shocked that it was still at the normal driving suspension.

Would love some expert insight. As of now, it’s just an “is what it is” situation in my mind.
 
Believe this will be fixed with the replacement of the Height Control valve. Seems like it’s a pretty rare failure, curious if anyone else has experienced this.

My AHC pump died recently and I’m wondering if the control valve being worn caused the pump to constantly be over working. Leading to it inevitably quitting on me.

This may be useful information to someone, in case they’re wondering if the control valve is worth fixing.
 
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