Suspension problem even after replacing almost everything

[bdac]

Perhaps somewhat off topic but I wanted to throw this out there. My LX470 has felt more rough lately, however I attribute that to driving my wife's LX570 more. Yesterday I lubed the driveshaft and u joints with Mobil1 grease and it noticeably made the overall ride on paved road more smooth. Worth a shot.

 

[PADDO]

Neutral pressures are fine - front 6.4 and rear 6.3 (barely on the low side). Tires are P at 35psi.

One oddity... I decided to replace the AHC fluids again thinking the previous fluid was so bad I didn't get it all flushed. When I tried to drain the accumulator (think that's the name - the cylinder shaped one between the two drivers side globes), nothing came out. The pressure in the accumulator was I think 10.4 the day before when I measured it, but no fluid drained - tried several times. Maybe a clogged hole... Unfortunately I ran out of time to investigate further and will have to get back to it in a couple days.

Your front pressure is at the low end of the specified tolerance, back off the TBs and set your front to the optimal 6.9MPa and see how that performs. Too high or too low neutral pressures are undesirable and I've found setting the front to 6.8 or 6.9 is ideal. That's normal behavior for the height accumulator if it hasn't had the chance to do a full recharge cycle.

 

[dabasscow]

Can you post pics of the front suspension and how thick the torsion bars are?

 

[SWUtah]

 

[dabasscow]

HArd to tell what the diameter of the bar is. Looks aftermarket, after market tb's for NON AHC vehicles are 32-34mm, OE AHC tb's are a lot thinner and really work as a supplement spring as the hydraulics set the height. it possible if your are running a afermarket tb with a stronger spring rate the hydraulics don;t need to carry the weight, so the presure drops, as the shock is the height controlling device and dampening device if the presure is down for the AHC maybe it affects the dampening forces as well. Just a thought.

 

[mistersiumai]

Your neutral pressures are better, front is good and rear is lower end of range, any chance you have aftermarket coils or packers? At this stage I think we are past blaming neutral pressures for your lack of damping. Height at 19.5 and 20" is in line with expectations. There is a procedure (posted severla weeks ago under heading of "AHC fsm") to specifically measure between the axle c/l and suspension bolt centers which will give you heights down to the millimeter, but 19.5" and 20" hub c/l to fender is rough enough at this stage. Your selector switch is reporting correctly through techstream. Not sure about the damper test you did and any differences in JDM vehicles. I've attached the US market procedure were you short Ts and E1 of DLC1 (under the hood). 1 is softest 16 is hardest. I can't honestly detect 16 incremental steps of firmness, but if everything is working you will easily tell the difference between soft, harder and really firm. I know you replaced your 4x globes initially and now is a good time to confirm they are still serviceable by checking the number of grads between L and H. They could have failed due to contaminated fluid or a manufacturing defect. Check they are still functional, at 2 years old you should have maybe 11 or 12 grads at least, if 14 grads is/was new. Being aftermarket units do you know what their initial charge/volume ratio compared to OEM is, some vendors state they can tailor charge pressure to clients needs. If you can't get any damping response in the manual test then its another nail in the coffin for failed damper actuators. You could try running a can of fresh fluid through the system and set the damper switch to softest and hit some roughs to see if it frees anything up. Cheaper than $2k for damper actuators. Good luck.

Is there a damper checklist for a 98 100 series LC? Would be so helpful. Thanks guys