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[cem_devecioglu]

Or could it be that the software I have installed is out of date and needs updating ? Havent a clue tbh.

sorry (as I'm a bit far to subject)  what software did you install and did anything change after software install ?

[cem_devecioglu]

Albitz, if you ask my opinion shortest route to solution is bring the car to another member who have a similiar lpg kit and try swapping injectors and some other bits

[zirk]

Slightly a different angle here Albs, is the water temp, flow, vaporizer temp doing its bit? that can cause random miss fire and miss fire codes to pop up.

[albitz]

May not need to go that far Cem.I think I need to get the interface issue sorted.Then I can plug in the laptop and may well be able to see if anything is wrong on the LPG side of things or if I still need to go back to the HT circuit.
Just need to establis if it could be an update issue or similar before going down the route of acquiring a new interface.

Not certain tbh Chris.When I first got the car the LPG/coolant plumbing had been installed badly and it kept switching over to petrol,but didnt misfire.Replumbed it properly and it was fine after that until this misfire appeared.Its very much like a classic dispack breaking down,but Ive changed it twice now (along with HT leads)and nothing has changed.

[cem_devecioglu]

May not need to go that far Cem.I think I need to get the interface issue sorted.Then I can plug in the laptop and may well be able to see if anything is wrong on the LPG side of things or if I still need to go back to the HT circuit.
Just need to establis if it could be an update issue or similar before going down the route of acquiring a new interface.

Not certain tbh Chris.When I first got the car the LPG/coolant plumbing had been installed badly and it kept switching over to petrol,but didnt misfire.Replumbed it properly and it was fine after that until this misfire appeared.Its very much like a classic dispack breaking down,but Ive changed it twice now (along with HT leads)and nothing has changed.

than please check the connectors/sockets to injectors and also other related stuff.. it may be an electrical problem
 
and is the battery+earth  in good nick

[albitz]

Connectors appear good,and injector solenoids all sound as though they are working ok as far as I can tell. Battery/earth fine.

[Taxi_Driver]

I went through a similar problem with a lpg vectra, it was missing on lpg. I tried a couple of coilpacks bought from scrap yards....in the end i stumped up about £120 for a new one from vx.....it cured the missfire.....not saying it would fix your problem......but beware some 2nd hand coil/dis packs work fine for petrol but dont quite give enough of a spark for lpg.

[albitz]

That is in the back of my mind tbh,but Im trying to avoid buying a brand new genuine dispack just for elemination purposes.
Any used dispack could present that problem unless it came from a car with LPG installed and was from someone completely trustworthy,so its a bit of a dilemna. My thinking is to persue least expensive options first.

[Taxi_Driver]

That is in the back of my mind tbh,but Im trying to avoid buying a brand new genuine dispack just for elemination purposes.
Any used dispack could present that problem unless it came from a car with LPG installed and was from someone completely trustworthy,so its a bit of a dilemna. My thinking is to persue least expensive options first.

Point taken  I was fortunate as at the time, i had 2 lpg vectra's......so swapping parts from the one without the missfire didnt cost me anything and nailed down the problem