Clean plugs vi­tal for LPG sys­tems

NT News - Motoring - - CARS GUIDE -

Q: Re­cently, I at­tempted to start my 1998 Toy­ota Land­cruiser Prado which had been re­fit­ted with 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 that the con­di­tion of the spark plugs and leads are crit­i­cal.

But these were re­placed only 12,000km and 20,000km ago.

Hav­ing re­placed the air box, what can I do to pre­vent this hap­pen­ing again?

Peter Mann, email.

A: The ex­plo­sion is a re­sult of the air/LPG mix­ture in the in­take man­i­fold ig­nit­ing, most likely set off by a stray spark. Change the plugs and plug leads again, they are usu­ally the cause of this prob­lem.

Q: I read some time ago that you should in­flate your tyres three to four PSI above the pres­sures rec­om­mended by the ve­hi­cle man­u­fac­turer, as they spec­ify a lower fig­ure to give a softer ride.

Do you agree with this?

James John­son, email.

A: The tyre pres­sure spec­i­fied by the car­maker is one that gives the best blend of han­dling, brak­ing, ride com­fort and tyre life.

In other words its 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 you will at the same time make the ride less com­fort­able.

Q: I rec­om­mend any­one think­ing of con­vert­ing his or her car to LPG to think again. I con­verted a 2003 VY Com­modore V6 and switched to LPG de­spite be­ing told by my dealer not to, and have had noth­ing but trou­ble ever since.

Now run­ning on petrol, I 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, Wat­so­nia, Vic.

A: It’s un­for­tu­nate that you’ve had a bad ex­pe­ri­ence with LPG, as your car is one that con­verts well and thou­sands of mo­torists have done it be­fore you.

But re­mem­ber it is worth­while talk­ing to a num­ber of con­vert­ers and own­ers who have made the switch to get their first-hand ex­pe­ri­ence of any trou­bles they might have had.

Q: My 2003 Mazda SP23 is classed as un­suit­able for ethanol blended petrol, but I was told that BP petrol sta­tions in­clude ethanol in all their un­leaded petrol.

Is this true? If so why is that not stated on their premises iden­ti­fy­ing signs be­fore one drives into the servo?

Peter Sauer­berg, Hol­land Park West, Qld.

A: The al­ter­na­tive fu­els peo­ple have told us that it is ac­tu­ally not cor­rect.

All petrol com­pa­nies must dis­play no­tices on pumps when ethanol is present in the fuel.

Q: My Honda Jazz, now out of war­ranty, has been ex­pe­ri­enc­ing sim­i­lar gear­box trou­bles as re­ported by some of your read­ers.

Newspapers in English

Newspapers from Australia

© PressReader. All rights reserved.