Holden Problems

Yes, you should. Speak to the manager and express your  disappointment at being mislead in this way and ask that they honour the warranty they say applies.

You should insist on having the problem resolved, if that means replacing the gearbox then so be it. But I wouldn't insist on replacing the gearbox straight up, as the cause of the problem might not be the gearbox.

You have experienced the problem that is the fuel consumption guide. The fuel consumption in the ads and the guide are the results of tests done under laboratory conditions, and not necessarily an accurate guide to what might happen in real life. They are meant to be used to compare one make and model against others in the same class, they're not intended to be an outright measure of real life fuel consumption. That gives carmakers the wriggle room they need to get out of a problem when customers, like you, complain. I think you are within your rights to demand that the dealer/Holden thoroughly check your car instead of fobbing you off and make sure it is within the factory specifications. Once that is done you could test your false advertising allegation, but that's a legal question best answered by others. I do, however, have some sympathy for your view.

It's not related to the fuel system as the Impco system starts on petrol every time, whether you've got the system switched to petrol or LPG. It's more likely to be an engine sensor, such as the crank angle sensor, which is playing up intermittently. Check the connections and the sensor itself. As for the warranty, you did the right thing in reporting while the warranty was in effect, so you could have a claim against Holden once the cause of the problem is  determined.

The system is designed to start on petrol every time, whether the switch is set to petrol or LPG, so there should not be any difference in starting. It sounds as though at times it could be trying to start on LPG instead of petrol. You should see an IMPCO specialist to have the ECM checked to make sure it is actually being told to start on petrol.

It does sound as though it is using too much oil. Sit down with the dealer and work out with them how they will tackle it, and press them for a solution. Also check the oil level weekly so you don't inadvertently run out of oil.

That's a tough one, but you would have to think it's external to the transmission given it's twice been replaced. It could be a number of problems, from a speed sensor, the gear position switch or the ECU. The best thing is to get it to an auto transmission specialist and have it checked.