Holden Problems

It does seem excessive, but first you should actually measure the fuel consumption so you really know what it is doing. Going by the gauge is no real indication of the consumption. If it is using half a tank for 100 km, then have it checked out; it could be a faulty oxygen sensor.

It's best to choose a reputable brand, one that has been on the market for some time, and it should be a sequential injection system. Holden uses an Impco system, and that's certainly one to consider, but there are others as well. To find an installer go to the LPG system manufacturers' websites and get the list of their accredited people. It's always a good idea to talk to other people who have made the same conversion you are planning, and get their recommendations on systems and installers.

No one else has reported the issue to us, but you won't do any damage by driving in 4WD high on the highway.

Are you confident that the odometer reading is correct; that it hasn't done a lot more than the 190,000 km it's showing. Check the compression, the engine could simply be worn-out.

The 7-seater can be done, but the ability to fold away the rear seat is lost. The other problem is where to locate the spare wheel, as the LPG tank is located in the spare wheel well. It’s possible you could use a space-saver spare, or a can of foam for emergencies. The best thing to do is to consult an LPG installer and get their advice.

Whatever you do, don't drive it, don't even start it. It's likely that you have done serious internal damage already and driving it, starting it even, would only damage it further. Have it towed to a mechanic and have the engine checked. I fear the damage extends well beyond the water pump.

You're certainly doing enough kilometres to justify switching to LPG, but you need to establish the health of your engine before committing. It has already done over 200,000 km, and while the 3.8-  litre V6 is a pretty tough old nail you have to think its best is behind it. At the rate you travel it will have done more than 350,000 km within the next two years, and that's a lot. I would be reluctant to convert it because of is age and kays done, but if the engine is in good shape it could be worthwhile.

Our LPG experts tell us there are a couple of issues that could create such a problem, but the most likely is that one of the control modules in the gas system has been damaged by water intrusion. Take it to an installer experienced with your brand of system.

I would consult an auto transmission specialist before doing anything. It could be that it only needs servicing.

It could be the diff itself or the diff mounts. Check the mounts first, if they check out ok, consult a diff specialist.