Hey guys,

A couple of days ago I drove a TJ II Executive 3.5L V6 and it was dual fuel.

I am looking at buying one but on carsales, they seem to either be unleaded only or LPG only, not only that, there doesn't seem to be many around on LPG.

Does anyone here own one? Do they run good on both fuels? I don't want to buy one and convert it myself, I would rather buy one that had gas fitted from factory.

my TJ vr-x is duel fuel, great option to have! in terms of power, driving around normally honestly it is hard to tell the difference, the real difference is at 100km/h when u go to overtake someone, petrol is wayyyyy better, also going up hills in 5th, petrol is a lot more comfortable. But you still get awesome kick with gas when trying to scoot through traffic.

You do notice a difference in terms of fuel consumtpion, the gas is used up quicker, roughly maybe 1/3ish quicker, just depends on how u drive.

Myself, i prefer to run on petrol most of the time, but being a student its always handy to have that cheaper filling option! but i wil generally go 2-3 rounds of petrol then go to a round of gas (always leaving in min 1/5 to a 1/4 tank full

my TJ vr-x is duel fuel, great option to have! in terms of power, driving around normally honestly it is hard to tell the difference, the real difference is at 100km/h when u go to overtake someone, petrol is wayyyyy better, also going up hills in 5th, petrol is a lot more comfortable. But you still get awesome kick with gas when trying to scoot through traffic.

You do notice a difference in terms of fuel consumtpion, the gas is used up quicker, roughly maybe 1/3ish quicker, just depends on how u drive.

Myself, i prefer to run on petrol most of the time, but being a student its always handy to have that cheaper filling option! but i wil generally go 2-3 rounds of petrol then go to a round of gas (always leaving in min 1/5 to a 1/4 tank full

Yeah I plan on using it on petrol around town and use LPG when cruising down the western highway. At the moment in my TF Magna which has the 2.4L Engine, I have to fill it up every second day and it takes between $60 to $70, and that ends up being a lot by the end of the week, so I would like to go back to having LPG again.

Thanks for your reply as well, that was exactly the kind or answer I was looking for haha.

Hi mate,

Do you mind posting up the links for factory lpg dedicated TJ magna's? To date, I've only ever heard or seen the TL/TW's being dedicated. I have heard a rumour that some fleet TJ magna's and overseas diamantes were produced with dedicated lpg.

Those that are on lpg from factory, use mixer systems from Impco. I know that you can get genuine impco systems make to work with the magna's. These work with the ecu and the fuel dial changes the level as per the fuel chosen. Most other systems are less integrated and the lpg ecu unit has the fuel gauge. I was told that the actual system is a bit slow and most of the installers would not bother with them anymore.

I've had my TJS2 converted to use lpg with a Sprintgas closed mixer system by Regent transport in Dandenong (really knowledgeable and top blokes!). Some others around have injected systems but I find this a complete waste of money for a car this old and this low in value. Plus with the rebate permanently at $1000 until Jun 30 2014 (when it will no longer exist) means that the cost to install injected is quite high as well and it will take the better part of almost 3 years to recoup the costs. Sure the injected system doesn't loose power and it's more efficient, but the difference in efficiency is easily outdone by the outright cost of an injected system. If you need power, switch back to petrol.

My experience with an lpg mixer system has been quite positive. Being a closed system, it is mostly computer controlled and works well with the magna ecu. My system turns the car on using petrol and then switches over to lpg later. I've never had problems with the car misfiring, not starting or even backfiring. Only one time did the car backfire which was due to the disconnected MAF sensor. (all that was damaged was a slightly black air filter). Otherwise, I've had no real issues. Sometimes the lpg system has stalled but I would say in 35,000kms on lpg - it has stalled maybe 15 times? I beleive this is just happening because my lpg system needs a quick tune and service (all done with a computer) it could also be that my tps is slightly misadjusted. Other than that I love being on lpg. Maintenance being an old mixer system is low and it's a very easy system. All I've done so far is replace the plugs and leads which in total cost around $120. can't verify this myself, but I have heard on good word from multiple installers that the 6G74 run extremely well on lpg with little problems. One installer said that he had falcon's with more problems on lpg than magna's (falcon i6 engine's are usually claimed to be the best for lpg). At it stands, my car runs perfect on lpg whereas on petrol I'm having a hunting idle with slight roughness.

The performance is great for a mixer lpg - it's somewhat slower on lpg (I'd say around 20%) - it's mostly lacking in power in the high revs instead of actual torque off the line. For day to day driving you'll seldom notice the difference. I find the engine is more responsive with lpg than with petrol anyway. I've put my car on the track and had it running on lpg, and my passenger was quite surprised at actually how much power I still had. Overtaking is no problem with the lpg system as well. Otherwise it's a quick flick back to petrol and she's right to go within seconds. In my car - going from lpg->petrol is quick, but switching from petrol-> lpg can stall if the rev's aren't kept above 1000rpm. Again this is probably a tune. I've haven't yet serviced my lpg system since it was fitted in early 2010.

As for factory vs. aftermarket - at the end of the day, I don't think it makes much of a difference. Any lpg installer can fit up a mixer system - it's really easy. Heck, I could've probably fitted up an open type lpg system but no one would certify/compliance my work. My closed system is a bit more tricky and I'm happy to have it done professionally. I would take an aftermarket system instead of a factory system, especially considering that lpg systems need to be overhauled every 10 years so any TJ/TL magna you'd buy will need to have that done this year or next. With a new system you get to choose what system you want and you end up with brand new parts. Plus you might not find as good condition lpg magna 2nd hand as you would with petrol ones.

If you're near the S.E. burbs then come along to a meet and I'll take you for a quick spin to see how mine performs.

As for my economy - I've got a manual and it doesn't get driven like a granny's electric scooter and I get around 15L/100km's in the inner city suburbs. If I'm a bit more gentle on the throttle it can get to around 12.5L/100km (at best).

Also - I can't really can't see why you would run the car through so much petrol? Do you really think it's making a difference to the life of the engine? Do some research and you'll find it makes little difference. It's cheap - why not run it as much as you can? Otherwise you're just throwing money out the window and it's pointless, unless of course you really want maximum power for most of your driving. I like

I run a 4:1 ratio of lpg to petrol - everytime I fill up 60L of lpg (full tank) - I'll chuck in about 15L of petrol. That's seriously all I need. 35,000km's later and the car still runs great.

The one I worked on was still at work this morning! Now I with I had taken photos. It was a 03/2003 TJ II Executive and when I bought it in to the workshop it was running on petrol. Then when I took it for a road test, I found the LPG switch (under the ash tray area), switched it to LPG and "LPG" appeared in the digital display (where the odometer is), and the fuel gauge changed from half to nearly empty. It is also a mixer system, it wasn't liquid injection. I know because I had to move the inlet manifold to get to the rear bank spark plugs. Another thing I noticed was in the boot, the carpet was moulded around the tank so you couldn't see it, you could just see the lid where the tap to turn it off is.

I will look for some on car sales now and when I find them I will post them up.

Also when this Magna comes back to work (to have the radio refitted), I will see if I can take some pics and maybe a quick video or something.

That sounds like a magna with an impco system fitted. I was told that the impco systems work with the fuel guage and the ecu to turn on the lpg light etc - I did want to have that installed but some installers refused to do it and rather used systems they were familiar with. I remember one installer telling me that he had customers that had problems with the impco system with the guage not working after some time and other problems.

If it's an open system (not sure) then I'd go for an aftermarket closed lpg system. These are far better - little bit more power and starts on petrol - which really helps with nice starts in the morning. Mine always fires up first time, every time. Other friends of mine with lpg need to give their cars a good crank a few times to get theirs started.

That sounds like a magna with an impco system fitted. I was told that the impco systems work with the fuel guage and the ecu to turn on the lpg light etc - I did want to have that installed but some installers refused to do it and rather used systems they were familiar with. I remember one installer telling me that he had customers that had problems with the impco system with the guage not working after some time and other problems.

If it's an open system (not sure) then I'd go for an aftermarket closed lpg system. These are far better - little bit more power and starts on petrol - which really helps with nice starts in the morning. Mine always fires up first time, every time. Other friends of mine with lpg need to give their cars a good crank a few times to get theirs started.

I am pretty sure what you have said is right though, because I can't find one with the switch in the same place, etc. But they did come out of the factory either petrol only or gas only:

http://www.carsales.com.au/car-valuations/?N=2994+4294949495+4294843003+4294965738+429480909 6&search=1#ctl08_p_d_ctl08_cboMake=4294949495&ctl08_p_d_ctl08_cboModel=4294843003&ctl08_p_d_ctl08_cboYearMade=4294965738&ctl08_p_d_ctl08_cboDescription=4294809096

That is 3.5 Gi, there is also 3.5i (which is just petrol).

Maybe the one I worked on was an ex fleet car. It even had a sticker next to the switch that had "Magna" in the title but can't remember what the rest said. I just thought that they must have come out of the factory duel fuel.

I'm of the impression that those TJ Gi versions were for fleet/commerical purposes instead of the consumer market. I would suspect they were for companies who have staff that travel long distances on the highways.

I remember reading an article where the TL became the first model where dedicated lpg was available to the consumer market and it was also more promoted and advertised.

I'm of the impression that those TJ Gi versions were for fleet/commerical purposes instead of the consumer market. I would suspect they were for companies who have staff that travel long distances on the highways.

I remember reading an article where the TL became the first model where dedicated lpg was available to the consumer market and it was also more promoted and advertised.

Yeah well a TL Magna comes in to work and that is a fleet car, and that is factory dual fuel. I noticed that the fuel light was on and it was showing half a tank so I was confused there. But didn't really take much notice to that car because it was in for a major service and they needed it back, so I just got the job done and they took it. But this TJ Magna was at work for a couple of days, if I knew that it was rare on something, I definitely would have taken photos and posted them here.

I've got the Impco mixer system which Mitsubishi fitted to its factory dual fuel and dedicated gas Magnas. I Haven't had any problems with it in 3 years and 75K. Also have the same system on my wife's KJ Verada - again, no problems in nearly 4 years. If you can't find a Magna with the factory fitted LPG, personally I would look for one with the Impco mixer system because in effect, it's the factory system that's been retro-fitted. By that I mean it's the system that was fitted at the factory that's been fitted to the car later.

CLICK HERE FOR DEDICATED GAS IN MAGNA INFO -TJ (http://www.goauto.com.au/mellor/mellor.nsf/story2/75DA95FC6FD7C8FBCA256D1700233BA5)

Mike

I don't get it. This was a 2003 TJ II Executive. It has the digital odometer on the cluster. On the digital screen right above the odometer when I switched it to LPG came up with "LPG" in the display, also the fuel gauge changed and then once I switched it back to petrol the "LPG" display on the digital screen went away and the fuel gauge went up to half.

Is this the only TJ Magna that does this or does other dual fuel TJ Magna's also display "LPG" when running on LPG?

I cannot find one TJ II Magna for sale on the internet with the same setup like the one that I drove. Makes me want to call up the owner and make him an offer haha, just need to sell my Statesman so I know how much I can spend.

Hey mate,

I have aftermarket LPG system fitted, cost $1750 ($1500 rebate at the time so $250 out of pocket). The car drives fine on both, but I would guess has 10% less power on gas - pretty noticeable, maybe 15%.
It uses 15 L /100km pretty consistently on LPG and 10 L on petrol - TJ 3.5 auto hardish driving through hills. Gas is sitting on about half the price of petrol over here in SA so that means about $5 in my pocket every 100km.
Travel about 20,000km a year so it adds up pretty fast, it's certainly paid for itself.

Plus when you fill up both tanks (150L) it's like free dumping of the rear end :)

Hey guys,

The TJ Magna came back into the workshop today to have the radio refitted (was send away to be repaired). Anyway while it was there, I managed to take a few pics to show you.

When on petrol:
http://i1142.photobucket.com/albums/n619/superchargedvs6/IMG_0980.jpg

When on gas:
http://i1142.photobucket.com/albums/n619/superchargedvs6/IMG_0981.jpg

Sticker next to switch:
http://i1142.photobucket.com/albums/n619/superchargedvs6/IMG_0979.jpg

Sticker and switch:
http://i1142.photobucket.com/albums/n619/superchargedvs6/IMG_0984.jpg

Book that was in glovebox:
http://i1142.photobucket.com/albums/n619/superchargedvs6/IMG_0985.jpg

http://i1142.photobucket.com/albums/n619/superchargedvs6/IMG_0983.jpg

http://i1142.photobucket.com/albums/n619/superchargedvs6/IMG_0982.jpg

Mines not factory but that is the exact same switch as mine, in the same place.