2007 Landcrusier Sahara Suspension Issues

Submitted: Thursday, Aug 30, 2012 at 14:07
ThreadID: 97741 Views:3224 Replies:7 FollowUps:10
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I have a 2007 Landcrusier Sahara and the gas suspension keeps rising automatically and becoming stiff, which makes driving it very uncomfortable. Has anyone had this issue and if so can they recommended a fix?

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Reply By: Member - Scooby (WA) - Thursday, Aug 30, 2012 at 14:09

Thursday, Aug 30, 2012 at 14:09
Stop putting Viagra in the tank.
AnswerID: 493921

Follow Up By: Jonno W - Thursday, Aug 30, 2012 at 14:15

Thursday, Aug 30, 2012 at 14:15
Funny stuff Scooby but sadly it's not the cause of my issue.
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Reply By: Ross M - Thursday, Aug 30, 2012 at 14:44

Thursday, Aug 30, 2012 at 14:44
Gas suspension???? Are you sure?? What type of gas??

Do you mean air suspension by any chance??
If it has air bag levellers and the bags blow up to/too hard, which is what I think you mean, then the fault is the levelling control valve which is attached to the suspension and effectively reads where it is sitting.
If this is stuck/jambed or dirty or bent the arm won't then move correctly or is bent away from it's normal positiion.
Hop/crawl underneath and find the valve and see if all looks normal.

Can be a hit from a rock or a stick or mud holding the valve and making the system think it isn't up to height yet so it tries to do it. = wrong input signal.
Arm may have come loose on the shaft of the sense valve too.

The bags can't blow themselves up, something has to be in charge of the pressure control to the bags. Logic must be applied here.
AnswerID: 493923

Follow Up By: Jonno W - Thursday, Aug 30, 2012 at 15:04

Thursday, Aug 30, 2012 at 15:04
Ross M. Thanks for your reply. I was advised it was gas, but air it is. Just as extra info, I can adjust the suspension, so it goes up and down, but it automatically ends up at neutral and is rock hard. So, given this I guess it's the levelling control valve. The mechanic at my local Toyota dealership hasn't come across this issue "EVER", and has had the car for two days and no closer to a fix. He thought it might need new suspension in the front @ $900 per side for the parts but I can't see how this will fix it as they go up and down, they just don't stay at the desired level.

FollowupID: 769566

Follow Up By: Member - Andrew W14 - Thursday, Aug 30, 2012 at 16:28

Thursday, Aug 30, 2012 at 16:28
Not sure if it is same as my 2006 Sahara, but if it is the automatic height control is hydraulically controlled. The car will default to the N position at speeds above about 30 kph.
If as many, including me, have done and added air bag 'helpers' inside the coils then the AHC will still work but if the pressure in the airbags is much above 5 psi with no load on tow ball then the ride will feel very firm.
If it has been converted to air bags then somewhere will be two valves to either inflate or decrease the pressure in the air bags (same for air 'helpers')
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Follow Up By: Jonno W - Thursday, Aug 30, 2012 at 17:20

Thursday, Aug 30, 2012 at 17:20
Andrew, I'm not car savvy but what your talking about sounds right. The car height does keep going to neutral so I guess it's the Auto Height Control we are talking about as well. So, how does this all work then, I assume the AHC works independently to the suspension so I'm getting my wires crossed here thinking the AHC is part of the suspension.
FollowupID: 769572

Follow Up By: The Original JohnR (Vic) - Thursday, Aug 30, 2012 at 18:56

Thursday, Aug 30, 2012 at 18:56
I am presuming it is a 100 Series run-out not an early 200 Series Sahara?

If the AHC settles to Low, it is an indicator of higher weight in the rear of the car and requires some help to carry it. 250Kg is sufficient to make that happen, a couple of bigger adults and luggage can do it. Alternately a heavy caravan draw bar can do it.

If you switch to High, and accelerate over 19mph or 30kph, it will settle to Normal.

To overcome issues, I took out the springs and after trying three different sets of coils, bought Firestone airbags to totally replace the coil springs.

Andrew is quite right, the Sahara 100 AHC system uses hydraulic oil to pump up the height. There are some gas cannisters though that hold nitrogen along the side rails that may require attention. I have seen suggested elsewhere that the AHC system is good for about 200,000 kms before heavier maintenance. Some people advocate removing all the AHC system and putting in a standard modified suspension, but because it is all in the computer system with the traction control and stability control, it sounds to me like a big job!
FollowupID: 769576

Reply By: dindy - Thursday, Aug 30, 2012 at 16:36

Thursday, Aug 30, 2012 at 16:36
Jonno W,

I haven't got a clue what's wrong with your vehicle.

What I do know is when a Toyota mechanic/ technician / tool monkey says he doesn't know what's wrong and suggests throwing money at the thing that's when I would remove my vehicle, unless it's under warranty or you have deep pockets, from their grasp and take it to someone who knows landcruiser suspension.

Grab the yellow pages and do some ringing around. Google is a friend in these matters. Go to LCOOL.org sign up its free, a mountain of help there just ask.
AnswerID: 493928

Follow Up By: Member - Phil G (SA) - Thursday, Aug 30, 2012 at 18:44

Thursday, Aug 30, 2012 at 18:44
Yep, definitely a question for the people at the LCOOL forum. Plenty of people there with the 200series Saharas.
FollowupID: 769574

Follow Up By: Ross M - Thursday, Aug 30, 2012 at 18:52

Thursday, Aug 30, 2012 at 18:52
Good reply there Dindy

If the Toyota teknishun doesn't immediately know where the problem lies then he isn't a Technician or a trained person. It certainly inspires confidence doesn't it.
I just love the "we'll fix it for $900 a side" attitude presented by the dealer in the absence of good, well informed and knowledgeable response.
A good way to get rich quick and they might even discover the problem on the way, if they are mechanically astute enough to do it.

Jonno W, DO NOT have those unprincipled cowboys get near your vehicle, or if you let them have a go, leave your wallet on the front desk.

IN reply to your question. The AHC system is connected between the body and the suspension. If it has a 4 wheel system, then it will usually have sensors located near each wheel. maybe A sticking valve will cause your problem.
If only one rear sensor it will be located between the body and near the diff centre.
FollowupID: 769575

Follow Up By: The Original JohnR (Vic) - Friday, Aug 31, 2012 at 09:07

Friday, Aug 31, 2012 at 09:07
Ross, if you read the original question again, the suggestion that it is rising and then getting stiff, being uncomfortable. The "getting uncomfortable" indicates that it has settled to Low where it will more likely be riding close to the bump stops. Perhaps weight is the issue or in the case of ours, insufficient air to carry the mass in or on the back of the car. Polyair or Firestone inserts the easiest option.
FollowupID: 769626

Reply By: mountainman - Thursday, Aug 30, 2012 at 21:27

Thursday, Aug 30, 2012 at 21:27
if it was my cruiser.
id be calling ultimate suspension.
these guys realy know their stuff.
their customer service is from years gone by,
they have experience in the overseas markets where the vehicles are made bulletproof and require the suspension to suit the extreme weights of the upgrade.
and being the 100series theyd know the suspension like the back of their hand. as its in every country worldwide.

many people cant say enough about ultimate, wished i bought their stuff the first time.
if they cant help im sure theyll have someone in the know, or a decent toyota dealer that could help.
phone call, why not i say.
AnswerID: 493952

Follow Up By: Jonno W - Monday, Sep 03, 2012 at 10:00

Monday, Sep 03, 2012 at 10:00
OK, I have had feedback from the dealer and they are saying it's the front AHC cylinders that are the problem but they are checking the shocks by taking the cylinders off and bouncing the car. They clearly have no idea and the cost at this stage is $2,700. They have had my car since last Wednesday, just to add salt to my wounds.

Thanks for all the feedback.


FollowupID: 769795

Reply By: Jonno W - Friday, Aug 31, 2012 at 05:29

Friday, Aug 31, 2012 at 05:29
Thanks for all the tips, really appreciate it. I spoke to a guy at Pedders and he has had some experience with this. There was a note on their computer from the Maroochydore store about a guy who spent $6,000 at the local Toyota dealer for the same thing and it didn't fix the problem, no money back then replaced the AHC etc with coils and shocks.

The dealer is waiting to hear back from a Toyota HQ technician but I will opt for a second opinion as you suggest but it does look like I'm going to have an expensive haircut either way.
AnswerID: 493961

Follow Up By: splits - Friday, Aug 31, 2012 at 08:07

Friday, Aug 31, 2012 at 08:07
"The dealer is waiting to hear back from a Toyota HQ technician"


What is happening servicing? Back in the days when I worked in the service office of a major dealer. I would simply ring the state distributor for Toyota commercial vehicles, or put the mechanic on the phone, and we would have the answer in minutes. That was where the factory training school was located and we would speak directly to one of the instructors. On the rare occasions that they did not know, they would get the answer from Japan as fast as possible and we would keep the customer up to date on what was happening.

Whatever you do, don't let anyone fix anything until they know exactly whet is wrong. Guessing can be very expensive.
FollowupID: 769623

Reply By: MEMBER - Darian, SA - Friday, Aug 31, 2012 at 09:32

Friday, Aug 31, 2012 at 09:32
Agree with some of the above - these episodes can be life changing !
Apparently (my experience certainly)... the following rules are set in stone.....
Dealers always say 'we haven't seen this before'.
Any estimation of costs should be taken as grossly understated.
They see your order for work as one of ''trying to fix it'' @ $ per hour - the outcome doesn't affect the money they want.
There are worse observations on dealer practice, here and elsewhere, but that is enough for now :-o).

As mentioned above, if you have the time, there is knowledge out there that can save you $$$ - can't do better in my view than start at Lcool..... a wealth of knowledge shared by owners for free !
AnswerID: 493975

Reply By: Member - " H " (VIC) - Friday, Aug 31, 2012 at 23:21

Friday, Aug 31, 2012 at 23:21
Hi,All as a previous 100 series Sahara owner I Had nothing but trouble with the suspension going down all the time our caravan weight was just on 2000 kg with no more than 105 kg ball weight , reported it with every service but they could find not thing wrong even towing a small 8x4 trailer zrhe dame thing went down got so sick of it changed or upgraded to a 200 series Sahara and have not looked back exept the fuel it drinks

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