The big bang theory
BLASTED PEST Recently, when I tried to start my 1998 Toyota Landcruiser Prado on LPG, there was a large explosion and the air box was blown apart. I have since learnt that this is not uncommon for vehicles fitted with LPG systems and the condition of spark plugs and leads is critical. These were replaced only 12,000km and 20,000km ago. Having also replaced the air box, what can I do to prevent this happening again?
Peter Mann, e-mail.
The explosion is a result of the air and LPG mixture in the intake manifold igniting, most likely set off by a stray spark. Change the plugs and plug leads again. They are the usual cause of this problem.
RIDING HIGH I read some time ago that you should inflate your
tyres 3 to 4psi above the pressures recommended by the vehicle manufacturer, as they specify a lower figure to give a softer ride. Do you agree?
James Johnson, e-mail.
The tyre pressure that is specified by the carmaker is one that gives the best blend of handling, braking, ride comfort and tyre life. In other words, it’s a bit of a compromise. By setting the tyre pressure a few psi above the recommended pressure you can usually improve the tyre life, fuel economy and the handling— but at the same time, you’ll make the ride less comfortable.
IT’SNOGAS I recommend anyone thinking of converting his or her car to LPG to think again. I converted a 2003 VY Commodore V6 to LPG after being told by my dealer not to, and have had nothing but trouble ever since. I’m now running on petrol and don’t have a problem, but I’m a few thousand dollars down the drain. I say stick with petrol; our cars were not designed to run on LPG.
Patrick de Zilwa
It is unfortunate that you have had a bad experience with LPG, because your car is one that converts well and thousands of motorists have done it. But it is worthwhile talking to several converters and owners who have made the switch to get their first-hand experience of any troubles they might have had.
I have noted that the speed indicated on my GPS differs by as much as 4km/h from that showing on the speedo of my car, and it is always less. I have read that this is normal. Which one is correct?
I can’t say either is
‘‘ correct’’ but the speed shown on the GPS is probably the more accurate one.
Boomtimes: APrado LPG conversion hasmadeit a blast for all the wrong reasons