Robnicko replied:

Snowy,
Does it run bad on both Petrol & LPG?
I have a 80 series 96' model and use LPG as well. I have always used standard plugs and have never had an issue with them.
Can you give more info? Does it idle smooth? Does it seem like a misfire or stutter? Does it run like a pig under load only or constantly?

The air flow meter has a wire probe which if broken can cause many dramas. It's located between the air filter and intake. Large rectangular plug.

Rob

Member - Tour Boy replied:

Hi check the plug gap, the 80 series 1FZ-FE motor should be 0.8mm whereas the 100 series with the 1FZ-FE is 1.1mm.
If the plug gap is too large it will be a dog.
Regards
TB

snowy7 replied:

Hi Rob,

Yes it has a slight rough idle. It runs a little better on Petrol. To me it sounds like it misses when under load (accelerating) the power drains when ever i go up hill.
I'll have a look at that wire tonight

thanks

Member - Tour Boy replied:

Ditto the leads. If they have done more than 100k then they aren't as good as they should be.
I'm picking up a new set today for mine. I checked the resistance of the 2 shortest leads on the W/E and the resistance is higher than the worst that the longest leads should be @ 120,000km.
TB

Member - Peter R (QLD) replied:

Snowy7,
I had a 94 80 series and had troubles that included backfiring and a problem with air flow meter.

Other points mentioned in the thread I posted may be of assistance to you.
If you live in Brisbane give Scott a ring (number is in following thread) and he will sort you out.

link text

Pedro

Member - Jiarna (NT) replied:

Just an idea from bitter experience, but not with same vehicle as yours:

Double check that the plug leads are on in the correct order. If 2 are switched, it will start OK, idle a bit rough, and have the power of a souffle. Would have thought the mechanic would have found this, but check it anyway to be sure.

Cheers
John

Dallas from Team Green Autogas replied:

G'day Snowy,
I've found that spark plugs don't seem to make alot of difference at all. Normally faulty / worn plugs would cause it to backfire when on gas. Might be worth checking to see whether they replaced the air cleaner or at least dusted it out. Basically, if they've changed the air cleaner & now the engine is able to pull more air easier, it reduces the vacuum / draw on the lpg converter & it doesn't deliver as much gas. You'll starve of gas under load, running lean whenever you put your foot down & possibly backfiring even.
If it's got a manual flow adjuster in the vapour hose from the converter to the mixer, open it up 1 turn at a time, counting the number of turns & see if it makes it any better. If it doesn't come good then go back to where you started & go in 1 turn at a time & see if you can find the sweet spot.
If it's got a stepper motor then it'd be worth getting it into someone with a scan tool for that gas system & they should be able to adjust the program.

Regards
Dallas Green

snowy7 replied:

Fristly i would like to thank everybody for their advice. I eventually went and changed the spark plugs back to the platinum plugs and replaced the high tension leads. (thanks to the guys at outbound auto parts in brighton) this has given the old girl a new lease of life I found an increase in power, better fuel econ. and a smoother ride under load. Also for any who has a gas powered vehicle I was getting an intermittent starving of the gas at different times produced a very rough idle!! When doing a viaual check under the bonnet I was checking the connection for the gas computer and went to check the 7.5amp inline fuse. Lo and Behold it disintergrated in my hand. I replaced the fuse and no problems since. The old girl seems to be running quite good at the moment but if anybody knows of a 4WD/gas/landcruiser specialist in the southern area of Adelaide let me know.

Cheers

Snowy