AHC Fluid Change How To -- Need Input (4 Viewers)

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4.5 degrees should be fine. That's very little.

But yes, how do you calibrate without vgrs?
 
OK, so steering is fine.
As the LX is so sofisticated, why ddo I have a body roll when cornering? It is that much that I have to slow down a lot before taking a corner. Also the soft-sport setting doesn't do anything.
 
OK, so steering is fine.
As the LX is so sofisticated, why ddo I have a body roll when cornering? It is that much that I have to slow down a lot before taking a corner. Also the soft-sport setting doesn't do anything.

Body roll and other issues after changing your fluid, bleeding the system and getting neutral pressures to nominal specification? If so you should look at your sway bar link ends and bushings, I've replaced mine with super pro poly and they certainly tighten things up. OEM rubber are perfectly fine too and cost significantly less. In TechStream you can do an AHC active test ( or you can with an 03 at least) to check the front and rear AHC proportioning valves are working. I'd expect they are if you aren't getting coded thrown.

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All front bushes etc from the front swy bar are replaced with genuine Toyota gear only a few months ago.
I haven't done the AHC change, still have to see when that has been done. The fluid is very very clear in the reservoir. I can't even see the level on the outside.
 
All front bushes etc from the front swy bar are replaced with genuine Toyota gear only a few months ago. I haven't done the AHC change, still have to see when that has been done. The fluid is very very clear in the reservoir. I can't even see the level on the outside.

But we know your neutral pressures are too high.
 
Yes, we know.
 
Still there and not leaking.
Graduation is good, 8 from memory.
 
Still there and not leaking.
Graduation is good, 8 from memory.

8 graduations with your neutral pressures so high is a good thing. When, or if, you get around to addressing these high pressures you can expect to see a greater fluid range as the mechanical components (TBs and coils) will be carrying more static and dynamic load, loading which is currently being supported by the hydro pneumatics of the system. You really should get your neutral pressures back in spec to get something close to design performance back and not accelerate wear and tear on the hydro pneumatics bits - aka the globes.

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I found the receipt when t he AHC fluid was replaced.
It was done at 200,000 kms in July 2010.
The car has now 243,500 kms, three years later.
 
I found the receipt when t he AHC fluid was replaced.
It was done at 200,000 kms in July 2010.
The car has now 243,500 kms, three years later.

AHC fluid is a low viscosity mineral oil, it becomes contaminated with particulate from within your system, whatever stabilizers and additives in it degrade and oxidize over time and use, you can't rule out there is air in the system. Start fresh, baseline with new oil with associated bleed. Eliminate the inexpensive and easy maintenance items first.

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Will try to find a Saturday when I can do it.
I already have saved the step-by-step description from mud, so I know what to do.
My parents are over so no time this weekend.
 
All front bushes etc from the front swy bar are replaced with genuine Toyota gear only a few months ago.
I haven't done the AHC change, still have to see when that has been done. The fluid is very very clear in the reservoir. I can't even see the level on the outside.
It will stay clear in the tank even if you have black mud in the shocks. It doesn't travel far, just a bit back and forth. It's always the newest and cleanest on top.

Still there and not leaking.
Graduation is good, 8 from memory.
8 is not good. 8 is on the border to being shot. But, that is only true if the neutral pressure, ride height and lift height are at specs.
 
8 is not good. 8 is on the border to being shot. But, that is only true if the neutral pressure, ride height and lift height are at specs.

Well Toyota say 8 is fine. presumably it is not as good as 10 or 11 in the middle of the range. Once he gets his pressures down he will no doubt get back some graduation.
 
Standard value for Australia i 8 graduations or more, so 8 is on the verge. But again, pressures and heights first.
 
Standard value for Australia i 8 graduations or more, so 8 is on the verge. But again, pressures and heights first.

You are referring to this everytime.
What to do first:
- change fluid or
- try to get the pressure lower?

And what is the ride height and lift height specs?
 
You are referring to this everytime. What to do first: - change fluid or - try to get the pressure lower? And what is the ride height and lift height specs?

Not sure of the ride height specs but the only way to vary them is fiddling the height sensors.

If you're on 8 (which is more than 7 which I believe is the minimum spec) I would start with the easiest (TBs), then fluid, then coils.
 

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