Thread: Hard starting D1 3.9 V8 Dual fuel

Adjust the idle mixture on your LPG system. All new systems that I used to fit needed a couple of retunes before they settled down to a regular idle.

BTW I doubt that you bought a mixer for $600, you probably bought a converter. And I hope that at $600 it came with a layer of yellowish paint . Also, unless you find a brand name and model on the converter I can't tell you where the idle mixture adjustment lives.

Hi, I'm not sure whether this will help, but I've had a really good run with no backfiring issues on my 96 Discovery V8. The LPG fitter who installed my system in 2008 had the advice, "keep your electrical system in top order and you should have no backfiring problems" and with mine I've had no major issues in 65,000 km. A set of black Bosch leads and NGK plugs has worked OK for me with distributor timing and lpg tuning right. I did have some problems 18 months ago with the car running a bit rough on petrol and tracked it down to the injectors, a couple of which had gummed up through insufficient running on petrol I assume. At a cost of $30 per injector to have them cleaned in Aust. I put in a full set of reconditioned injectors for $100 from the US resulting instantly in a return to smooth running and power.


So maybe something in my tale to consider?


Cheers, adDisco

Hi Bee utey

You were on the button, its a brand new LPG converter unit that cost $300 the labour and sundries capped off at $600


I stopped tinkering with the idle screw thingy and have attached some picks of the installation and converter... I couldn't see any screw adjustment on it but then again I'm not too sure of what it is I'm looking for... and very sorry for posting a reply on the start of the Easter long weekend

Cheers
freddagg22

Hi freddagg22, Can you see a brand name of the converter stamped on it somewhere. All the ones I've seen have a brand name stamped on them. If you can find it then an internet search of, "tuning x lpg converter" may help you? A search of "tuning lpg converter" may help anyway?

OMVL R90E converter. The idle mixture adjustment screws are on the side facing the washer bottle, the 10mm hex one with the spring is the sensitivity adjustment and most likely to be the one out of adjustment. The 8mm one is the base idle and may need tweaking if the sensitivity screw adjustment doesn't make it stable.

BTW those converters are only $185 free postage on ebay, you have been charged top dollar.

omvl | eBay

Oh and I forgot, you may have the red and blue wires from the pickup reversed. No matter how many times I describe the correct order people often get it wrong.

Yours



Mine



Your timing will have needed a lot of adjustment to get it to run and your rotor button will not be aimed correctly at the cap terminals for firing. Put the wires on the correct way, readjust the timing to 10 degrees BTDC at idle, see how it goes then.

Hi freddagg22, Do let us know how things went with tuning the lpg. Bee utey's advice is great to have. Are you going to tackle your running on petrol issue?

Hi Bee utey
Pins 3 and 7 go back to the dizzy however I did the wire swap and... Started (surprised the hell out of me) sounded very deep and throaty at idle and angry when I took it round the block ...however no guts and lumpy at the lower rev range 1500-2000???

- the Newgas tech ripped me good... That just gives me the sh@ts

AdDisco - I'll tackle the petrol issue as soon as possible ....and update

Cheers lads

Look what I found on our website

Http://www.aulro.com/afvb/technical-...convertor.html