lx470 Suspension feels loose

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I’d get your rear pressure lowered to where it needs to be ~ 6.0MPa at 20.5 in stock rear height ~ before chasing issues that may not exist. You’ve got to start from a known good baseline and then systematically eliminate potential problems. 30mm spacers and new coils are a better option to correct high pressure, air lift bags are better suited for towing or occasional heavy load compensation. Your hit list of items you want to investigate all have multi page and interrelated DI procedures so investing in the FSMs and EWD will be worthwhile.
 
PADDO said:
I’d get your rear pressure lowered to where it needs to be ~ 6.0MPa at 20.5 in stock rear height ~ before chasing issues that may not exist. You’ve got to start from a known good baseline and then systematically eliminate potential problems. 30mm spacers and new coils are a better option to correct high pressure, air lift bags are better suited for towing or occasional heavy load compensation. Your hit list of items you want to investigate all have multi page and interrelated DI procedures so investing in the FSMs and EWD will be worthwhile.
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Ok I finally got new rear coils (king springs) and I believe I got the pressure to where it needs to be.
Here is at neutral
1967753


Here is at high
1967754


The new coils didn’t make much difference in ride quality. Same rocking back and forth when stopping.
This is driving me crazy :banghead:
The truck is PERFECT other wise. What could this possibly be?
 
So thinking about it, in a truck with regular “ on-ahc” suspension, A properly operating suspension system would limit stops and other stepping events to one damped motion with no oscillations.

The same concept applies to trucks with ahc. The difference is the responsibility to perform this function is spread over multiple components and not just the struts as in conventional trucks.

That makes it a bit harder to pin point the exact culprit if you’re not an expert on the subject or have not “seen” it before. Like my rookie self!


One way to troubleshoot this could be by elimination.

- Could it be shocks? One shock WAS leaking a little before I got new springs and adjusted rear pressure. Could shocks malfunction and cause this oscillation?

- Air trapped in line causing some kinda “give” effect in dampening? how to check?

- accumulators? The obvious candidate. The only thing that makes me not 100% convinced to drop 1g on them is that I swapped them with another vehicle that was not exhibiting this phenomena and that didn’t make any difference in BOTH trucks. Besides when I do the L-H test it returns 12 marks or so in the resovoir. Is there another way to check?

- stepper motor(s) : performed the 16 step test with tech stream connected while driving and was able to see the the step number change every time I press the brakes and the ride getting firmer and firmer til it got “too sporty” kinda harsh at 16

Any insight or advice from anyone is appreciated
Would one of the veteran members please chime in? @PADDO @uHu ...?
 
Very intriguing problem. you seemed to have traversed most of the at-home service and repair checks possible. Had issues with my AHC globes and ugly looking fluid at 450,000 km but managed to solve that with new fluid, new AHC globes and replaced rear coil springs. The rear springs required replacing as they were not holding up their share of the weight when I loaded the truck to the roof with people and gear and my Cruiser would sink into low mode onto the bumpstops until I took some weight out. I would think that a bouncy front and back movement would be primarily related to the front suspension components so perhaps a further tweak of the torsion bars might take the bounce out. Also, a further recheck of the comfort level setting switch operation might be required either checking its electrical operation and/or a road test seat of the pants assessment.
Best of luck you have to be persistent with these niggly items especially when you are such an enthusiast as most of us are on this website. Some people say good enough others persevere and enjoy the satisfaction of a successful solution being found for the issue.
 
Here is a video of what I’m talking about. The video is shot from outside the car. Notice the oscillation after every stop. This was during step test at step 16 so the vibration was very obvious from outside. At step 1 it’s still there but could only be felt inside the car.

 
That looks like a horrible shock (or two or three or four) or some serious play in the driveline.

What happens if you bounce on the vehicle while it's parked? If it bounces more than once up and down, shocks are the problem in my experience.

*edited remove comment about cheap shocks - that only applies to the LC without AHC, apparently.
 
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suprarx7nut said:
That looks like a horrible shock (or two or three or four) or some serious play in the driveline.

What happens if you bounce on the vehicle while it's parked? If it bounces more than once up and down, shocks are the problem in my experience.

Shocks are also stupid cheap for these vehicles. Around $35 each for the non-AHC. Not sure if AHCs are different. I'd start there.
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It’s ahc so it it the shocks, globes, something else...?
 
Castamile said:
It’s ahc so it it the shocks, globes, something else...?
Click to expand...

I just looked up shocks for the LX and nevermind my cheap comment. Looks like they're ~$180 each. Ouch. Still, I'd see if that might be the problem, though, as that seems likely.
 
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My rear axle feels like a pogo stick but when its in h mode it works perfectly, what was your fix?
 
So what was the solution? I'm experiencing that same vibration when I stop. A mechanic told me one of my front shocks were leaking. I don't see my levels go down. Plus I thought the shocks on the lx didn't do any major role in the suspension...
 
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