Runs on LPG but not petrol

**landrover dave** · 19th May 2011, 10:43 PM

Originally Posted by ozscott

Maybee I have had a bad run with my converters or with rovers, but both my 95 and 02 Disco V8's are will simply not run on LPG from cold when the converter is over about 3 months old...under that they will. One of my brothers is a mechanic and has LPG on everything he has - XA falcon, VH Chrysler Regal and a VH Commodore. They all run very well on LPG from cold...better than petrol. Mine wont run at all after a bit of gumming on LPG when cold. They run very well on LPG when warm..in fact better than petrol when warm (just that bit smoother - more noticeable on the 95).

I am paranoid about starting an injected vehicle with LPG because of backfire risk on startup, but perhaps that is not warranted?

Why are injected systems and for that matter Lambda single point mixer systems like my 02 optioned for changeover above a certain temp?

Cheers

Blocked converters are caused by butane that is put in lpg to pad it out. Butane contains tar which deposits in the converter, softening up when its warm. Cheap outlets like woolworths or coles servos have poorer quality lpg than more reputable outlets.
An lpg system wont backfire on start up if its running at correct mixtures and not too lean and always make sure spark plugs and leads are replaced every 20000kms unless you have platinum plugs, as lpg requires a fatter spark than petrol.
Never start an lpg motor with throttle open, that can cause backfire as well

**Chilly** · 19th May 2011, 11:47 PM

Hi All,

Thanks for all the help. Car sold before I mine!!

Mine should sell today..Friday. Just a case of person picking up...not buying another until I have the money.

bee utey...What type of LPG gas system should I look to fit to a 94-98 Disco?

Looking at a Dec 94, 240k's tomorrow and hopefully a 98 Discovery,335k's.

Would like a good size tank and to keep petrol tank.
What sort of cost am I looking at?
Am I correct in saying the Gas Injected system....being brought from UK is not suitable?

Thanks

Chilly

**bee utey** · 20th May 2011, 07:40 AM

Originally Posted by Chilly

Hi All,

Thanks for all the help. Car sold before I mine!!

Mine should sell today..Friday. Just a case of person picking up...not buying another until I have the money.

bee utey...What type of LPG gas system should I look to fit to a 94-98 Disco?

Looking at a Dec 94, 240k's tomorrow and hopefully a 98 Discovery,335k's.

Would like a good size tank and to keep petrol tank.
What sort of cost am I looking at?
Am I correct in saying the Gas Injected system....being brought from UK is not suitable?

Thanks

Chilly

There is no specific brand of gas system that is not capable of being fitted badly by a poor gas installer. Most gas systems I see can be improved. A basic system using a tank in the back and a ring mixer system fitted with new LPG tuned plugs leads and timing can go well. I would specifically avoid Impco systems as they are over rated and slow off-the-line performers.

Tank sizes depend on how much space you want to lose. Second hand tanks are freely available and when refurbished last as long as new ones and save hundreds. Marrelli gas injection addresses some issues but adds $1000 to the price. Set your budget first and work from there.

**Gremlin** · 29th May 2011, 11:24 AM

Originally Posted by bee utey

Either get some sooper dooper new/reco ones, or steal some from an older Falcon or Commodore. They are the same fitment for quite a few 90's vehicles.

Hi bee utey, in this thread you mention the use of older Falcon or Commodore injectors as a possible replacement. I have a 98 D1 and just curious should one of mine start to fail, what is a good year for an alternative to original ones?

**bee utey** · 29th May 2011, 04:04 PM

Originally Posted by Gremlin

Hi bee utey, in this thread you mention the use of older Falcon or Commodore injectors as a possible replacement. I have a 98 D1 and just curious should one of mine start to fail, what is a good year for an alternative to original ones?

To pick a number, 1994 was a vey good year...

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