AHC problem on my 100 series (1 Viewer)

[rover777]

Hi to all, a few months after I changed my shock absorbers I observed that the car was inclined on the left side, the difference is almost 3 cm. (about 1 inch). Also, I notice that when I drive on H even sometimes does it on N, but with 4 or 5 people it drops to L. This was till a month ago when started refusing to go on H the light starts blinking starts to go up and when is almost there drops on N. When we measured the pressure of the front was about 6.2, but on the rear was almost 10Mpa. So it is Toyota 100 98year (for Europe). I have drawers, a 3-rd battery which is on the rear left side, slide with two 35l fridges also on the left side over the drawers, a rear metal bumper with two canisters(for water and fuel) on the left side and a spare tire on the right side.
I am thinking of starting with rear spacers to try to drop the pressure or maybe i have to change the coil springs. I'm also thinking of changing globes and flushing the AHC system .
Am I thinking correctly I know I need HELP.
THANK YOU

 

[kevgentile]

best place to start is right here.

The ABCs of AHC - How to Measure, Flush, and Adjust all in one place

I initially put this in the Definitive list of AHC maintenance items thread, but at almost 800 posts long and growing, it's going to get buried and the thread itself is very unwieldy. In an attempt to make as focused a summary as possible, I present "The ABCs of AHC." It's intended as a...

forum.ih8mud.com

 

[LGU62]

That’s a lot of weight on the rear. If there is too much pressure on the ahc it will drop to low. Might be worth looking into stiffer springs to help bring your rear pressure down. King springs are a popular choice.

 

[jsloden]

With all of the extra weight on the rear you definitely need uprated springs.

 

[kevgentile]

I'd run it across a scale and get your weights, it'll help decide how much more spring you'll need.
Go through the ABC's of AHC literature and service the system. I can say from experience that a properly serviced and functioning system will easily handle several hundred pounds hanging off the rear along with a few additional hundred in the cargo area. Don't compensate for a system fault with springs, the extra spring rate helps take the constant load off. I run air bags since my load fluctuates by several hundred pounds.

Here's mine with nearly 600 pounds off the rear and about 350 pounds stuffed in the cab. The system operates as designed without the assistance of the airbags, but I utilize them for my long road trips.

 

[suprarx7nut]

Definitely need new springs - likely the King 79s.

 

[rover777]

I think that all my equipment is about 200kg, most of the time I travel alone or with my wife and my kid. This car is designed to carry much moor eqipment and people. I'll change springs (but I don't know what kind and do i have to instal different springs, because on the rear left is hevier than on the right ) for sure i will change globes( they are the original ones ) and follow the steps from the "sheet by YotaMD". Can sombody tell me which model of "Techstream" and what version must i buy so i can use on my Toyota 98'
Is it normal the light on the dashboard for "L" - level to be dim, it's not bright like "N" and "H"

 

[kevgentile]

Here's a thread that has been going on for several years regarding spring rates with AHC. I'd read through it as it will go over the info you're looking for. There are a few other threads carrying the same discussion but most of it is redundant.

Coil springs for AHC

Im going to install new coils in the rear in a couple weeks. Does anyone have a sense of how new OEM AHC coils compare to used and tired (180k) non-AHC coils? I can get a set of tired used springs for cheap, but I don't want a stiff ride. I may put a 150lb drawer system in the rear sometime...

forum.ih8mud.com

Yes, the L-N-H lights should all be equal brightness. It's been a while since I had my cluster open so I can't give an answer to why your's isn't operating as it should. Bulbs can burn the glass over time but still function. Could be a simple fix but you'll have to open it up to investigate.

 

[GTV]

Definitely need new springs - likely the King 79s.

At a minimum.

 

[geo5]

FWIW- after reading all linked resources about AHC and springs- I put king 79 on my 07, based on camping/wheeling loadout of around 350kg. Rides great. A little stiff unloaded around town but I leave around 50kg tools/recovery gear in there all the time so not totally empty.

 

[rover777]

Guys, can you tell me what kind of Techstream should I buy for Land Cruiser 98"

 

[rover777]

Yes, the L-N-H lights should all be equal brightness. It's been a while since I had my cluster open so I can't give an answer to why your's isn't operating as it should. Bulbs can burn the glass over time but still function. Could be a simple fix but you'll have to open it up to investigate.

90% of the time the light is bright, but sometimes it happens to go dim

 

[take123]

Just curious with it loaded what mpg do you get on the highway?

 

[rover777]

Just curious with it loaded what mpg do you get on the highway?

fully loaded and with the tent on the roof driving at 140km/h about 13-15 liters per 100km.

 

[Wilsil]

At a minimum.

Or non-AHC Landcruiser springs.

 

[GTV]

Or non-AHC Landcruiser springs.

Kings at a minimum, next step up would be standard LC springs.

 

[rover777]

what about if i install one pink 455mm on the right side and one purple 485mm long on the left side, which is the heavier side

 

[rover777]

Now I can tell you what happened, I bought new standard springs (pink) after I changed them, the result was the same, so I decided to install second-hand springs from the 80 series and now everything is perfect