Toyota Land Cruiser Problems

We haven't had any other reports of the issue you complain of. You might find different speeds, changing the tyre pressure, or different shocks might help.

I wouldn't be doing the fuel pump and injectors; it doesn't seem likely that that will solve the problem. I would be focusing on the drive side of the vehicle, I reckon it's a vehicle speed related problem, perhaps a wheel bearing.

If the shuddering isn't getting worse I would probably persist with it until it starts to slip. If it slips, then definitely replace it.

Your dispute is with the mechanic, who it seems hasn't completed the work you have paid for him to do, so that's where you should start. If that doesn't result in a resolution you have to resort to legal action, and I would suggest you take him to the small claims court in your state.

The computer is detecting a problem and sending the car into limp home mode, which explains the lack of power when it happens. Turning the ignition off and restarting it resets the computer, so it will drive normally. It's not possible to say what is causing the problem, but it's likely to be a sensor, perhaps the oxygen sensor, or an electrical connection.

Our LPG experts say it's unlikely to be air in the tank because the installation was done some 18 months ago. The most likely cause is a heat source influencing pressure in the tank, so check for modifications to the exhaust system etc.

The 1998 Landcruiser is a popular candidate for the installation of LPG and people who have installed LPG typically save about 50 percent on their running costs. In typical use, and with the government rebate, you could expect to recover your investment within 12 months. The engines operate well on LPG and without premature degradation, however as a precaution it is recommended that you have valve clearances checked every 50,000 km rather than manufacturer's recommendation of every 80,000 km. The worst-case fuel consumption, dependent on whether it's an auto/manual, would be approximately 25 L/100km.

Warning lights are not usually checked on cars prior to sale, but I would expect a dealer would repair the fault when it was pointed out to him.