80 series LPG consumption

Submitted: Thursday, Mar 10, 2005 at 09:16
ThreadID: 21113 Views:5262 Replies:7 FollowUps:4
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My 1994 automatic petrol/gas L/C has recently had some repairs to the LPG and is now using a lot more gas than previously.
Fitting of gas was done in 7/1997 with a 90 litre Impco tank which until repairs to gas system was returning between 320-350 k around town to 400-420 k on a trip per tank.
Now it has dropped to around 270k's around town and early 300's on a trip.

I enquire if anyone else with a similar vehicle can tell me what they get on gas and also where would be the best place to go on the Gold Coast or Brisbane to have the system checked for economy?
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Reply By: BenSpoon - Thursday, Mar 10, 2005 at 10:56

Thursday, Mar 10, 2005 at 10:56
Not familiar with places over east, but the way I got hooked up with the best mobs in WA is by having a chat to a taxi driver next time you are in a cab. They run their businesses on stuff, and tend to know the right people.
AnswerID: 101906

Reply By: TheUndertaker - Thursday, Mar 10, 2005 at 11:25

Thursday, Mar 10, 2005 at 11:25
Pedro, Hycraft automotive in Snook st. Redcliffe are the ducks g-ts when it comes to gas/petrol tuning , in my old jackaroo got better than 15/20% fuel economy after a tune from them, they service Qld ambos ect ,are one of the few that use a 4 stage gas analysis and pre/post dyno.
AnswerID: 101910

Reply By: Rod W - Thursday, Mar 10, 2005 at 11:34

Thursday, Mar 10, 2005 at 11:34

What is the usable amount of gas? How much are you puting in on each fill up? (a 90lt tank doesn't mean your are using the full 90lts). Has the float in the tank been reset?

As a comparison for you I have a 4.5lt in a troopy manual. 110lt gas tank, 100lt usable, it returns 4.6ks per litre.
AnswerID: 101912

Follow Up By: Pedro14 - Thursday, Mar 10, 2005 at 15:31

Thursday, Mar 10, 2005 at 15:31
G'day Rod W,
I usually fill up when tank is empty and it takes a bit over 88 litres.

The point is that I have done the same since it was first installed and it is only now since repairs that the drop in k's has developed.

FollowupID: 359774

Reply By: cruiser - Thursday, Mar 10, 2005 at 13:26

Thursday, Mar 10, 2005 at 13:26

I had an 80 series on gas as well, and found that I had similar problems. I happened to be on the Sunshine Coast visiting friends who recommended

Lot 8 Latcham Drv Caloundra QLD 4551
ph: 1800 801 120 L.P. Gas & Natural Gas Conversions--Vehicle

I went to him and I have to say, this guy performed miracles on my vehicle. It went better, had more torque and returned amazing economy in comparison to beforehand. He spent 4 hours (this is between Christmas/New Year about 3 1/2 years ago) and only charged me $150 and that included the Dyno Tune.

I would thoroughly recommend them.



AnswerID: 101930

Follow Up By: Pedro14 - Tuesday, Apr 05, 2005 at 14:40

Tuesday, Apr 05, 2005 at 14:40
G'day Cruiser and all others who posted,
Took my L/C up to Torquegas at Caloundra and they did the dyno tune.

Ron the principal told me that with an Impco the only way to tune them is by way of Dyno Tune, and after he finished I am inclined to agree.

What was discovered initially was that crank case breather was to dirty air and not into cleaner filtered air.
As they progressed with tune they discovered that

At WIDE OPEN THROTTLE it was set at 7%co which he reset at 1.8%co
IDLE was set at 6.95%c0 and is now at 1.5%co

In addition the Adaptive Fuel Processor had failed.

Cost was $150 plus parts and vehicle is running a whole lot smoother and has more power especially up hill.

They suggested I take a note of mileage over 3 tanks and use that as a guide to consumption.

The way it runs I am sure that the consumption will be much better than before.
Will post again after using 3 tanks.


FollowupID: 362379

Reply By: Pedro14 - Thursday, Mar 10, 2005 at 15:44

Thursday, Mar 10, 2005 at 15:44
G'day Benspoon,
Good idea re the taxi's, though at the Gold Coast the crowd that does the taxi's will not do private vehicles so that is not on.

Thanks to the Undertaker for the Redcliffe address, if I don't get some satisfaction will definitely give them a try.

Cruiser thanks for that reference at Caloundra; I spoke to Ron there and he assured me that the dynatune would sort out my problem.
It will mean a bit of a trip however, if they can fix the problem it will be time /money well spent.

As a matter of interest the vehicle haqs done about 188000ks (110 on gas) and Ron thought it may have something to do with tappets and valve clearance.

Will post in due course on what happens

Thanks to all for ready advice,
AnswerID: 101945

Follow Up By: Ray Bates - Thursday, Mar 10, 2005 at 19:22

Thursday, Mar 10, 2005 at 19:22
HI Pedro,
I have the identical vehicle as you and so has my mate. We both get simular fuel consumption from our vehicles as you used too. Yes there must be something wrong with your setup.
I have a setup where the engine automatically starts on petrol and the changes to gas when the engine revs are up.
FollowupID: 359798

Reply By: theshadows - Thursday, Mar 10, 2005 at 19:05

Thursday, Mar 10, 2005 at 19:05
when they fixed your system they would have played with the tune.

RETUNE IT> thats all.

I owned and impco system in my 60 as Ive said before and 360 was the norm on a 85 ltr tank of lpg.

I surgest the impco mixture are knowen to crap in them so whip of the mixture take it apart and clean with aero start. dont belive the mechanic when they say you cannot service them... you can.

clean and retune all will be fine.
AnswerID: 101977

Reply By: Member Eric - Friday, Mar 11, 2005 at 02:55

Friday, Mar 11, 2005 at 02:55
I have the same vehicle and had similar problems , Make sure its running lean and also that your timing is above factory spec . I run mine somewere between 8 and 10 deg
AnswerID: 102027

Follow Up By: Rod W - Monday, Mar 14, 2005 at 10:39

Monday, Mar 14, 2005 at 10:39
So Eric what is your fuel cosumption on gas and petrol?
FollowupID: 360086

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