Thread: Icom tank 80% shut off valve malfunction

If this is your first fill, how did you fill it to get it going? If you used an upturned bbq bottle you 1. will have flakes of crud in your valves, 2. will have compressed air inside the tank which slows filling rates to below the flow rate to shut off. And the mixtures will vary between auto gas and propane.

As for mixtures, I fitted gas injection to a '94 4500 Cruiser yesterday and I fitted an oxygen sensor just for the diagnostic side of things. This allows me to read the mixtures while driving. Very worthwhile.

This is the first fill I have done, but is the second fill the tank has had. Driven to the servo on petrol to do both fills.

I have bought some time ago now a couple of Range Rover oxy sensors to fit but have yet to get the time to fit them and don't yet have the proper tune resistor, although I am told that if I go to Jaycar with the correct resistance value I could just get one from there and solder in. Does that sound right?

Beeutey, I was toying with the idea of putting another lambda sensor in from the likes of a falcon or commodore in addition to the rover ones. The rover ones to inform 14cux and in tern the LPG, and the falcon one/s to hook directly to the LPG ecu which has capacity for 2 sensor inputs.
Doubling up I know but if the exhaust is out...that is the time to do it.

OR can I take more than one feed off the rover sensors? would that muck up the readings at all? (electricity is a bit of a mystery...)


I havn't read deep enough to know if the Marrelli system will be compatible with rover lambda sensors. I only say this as I know they are different in how they work.

Sometimes I feel as though I am dabbling in the dark arts, never really sure what is going to happen

Open up your LPG software and look under sensor types. My system has selectable readout for all common sensors used, including LR original. The LPG system can only use the sensor reading for information to help you tune, not self adjusting the mixtures. Just fit the LR sensors and get them running, tap in the wire to the LPG and you'll be roight.

This is how I tuned mine.

I've copied this from an email I sent to the suppler to see if I'd done it right.

He was happy that I'd done it correctly:


> Firstly cleared both gas & petrol maps & cancelled any corrections. > > I then did an autocal. Halfway through it said the 0.17ms correction > was not within parameters. > > I clicked OK & the AutoCal continued to the end. > > I then checked petrol timings on petrol & gas noticing that injectors > 5-8 had an increase in petrol timings when going from petrol to gas. > > Using the corrections button I adjusted timings for inj 5-8 until the > petrol timings no longer fluctuated when changing from petrol to gas. > > The timings ended up at 0.15 for inj 1-4 & 0.40 for 5-8. > > I read in the instructions that these corrections may be needed for V > type engines. > > Engine at this stage is running smoothly. > > Cleared petrol & gas maps again & went for a drive for about 15mins. > > Speeds for the course went from stopped to 110km/h. > > I then switched to gas & drove the same course with speeds & > accelerations as close as possible to the original petrol run. > > I then clicked calculate corrections, cleared the gas map & drove the > course on gas again. > > The gas map is now very close to the petrol map.

Thanks for that, that is helpful to hear how you did it. It is about what I thought I should do from reading the manual. I have an added problem at the moment in that my kickdown cable for the auto is dodgey, I only have use of about 1/4 throttle at the mo, any more and it sticks.
Makes the mapping a bit hard! So will get that fixed....um......soon!

Tell me, what diameter did you drill your injector nozzles out to? I rang the supplier in England who told me to take them out to 2.5mm, which I have done.

He told me to go 2.4mm.

4.0l high comp Thor.