very strang lpg troubles....

[stackner]

my vn just recently stoped running on lpg. it surged a little wqhile i was driving along like when you are running out of petrol (but i was on gas with a full tank) i put it on petrol and it runs fine. the next day it would not start on gas at all or run on gas at all only on petrol. today it wont run on gas still but it will just start on gas then stop emmediately. still runs on petrol but it will start on gas for a second and stall emmediately. any ideads? cheers.

[Morton]

You sould get it looked at professionally. I'm no expert on lpg, but it sounds like a pump problem, or an lpg fuel line problem. It can't be anything to do with your fuel rail, pressure regulator or injectors because petrol runs nicely, so you're looking for something at the lpg end of the car. Shouldn't be hard for someone with a bit of knowhow to narrow it down... problem with those sort of hiccups is you can never just point at something and go "that's the problem" before you get down and have a physical look at the car.

Hope it's not too expensive :/ (I also hope i'm not wrong, because that would just be embarrassing )

[genIIIbandit]

do u have a water leak inradiator? do u have coil negative? is the convertor freezing? check 4 power at the solenoid at the tank

[stackner]

do u have a water leak inradiator? do u have coil negative? is the convertor freezing? check 4 power at the solenoid at the tank

i do have a leak in my radiator i have the whole time ive had the car on gas i already know you need water and i keep it well topped up BUT thats something i didnt think of round the time it decided to stop wanting to go on gas (just starting then stalling emediately) the car did actually run very low on water and over heat....

what do you mean by COIL NEGATIVE?

when the gas first stoped working and wouldt even let the car start on gas the converter had actually frozen. it has frozen once before (in another car a vp commodore and the whole gas system was taken from it and put in my vn). and now it starts but stalls emediately (on gas).

i will check the solenoid at the tank in the morning. i have herd a lot of people having craped solenoids that i thought it might be the problem just seems strange that its like a little gas gets through for the engine to start then it emmediately stalls.

thanks for all the help though. want her running on gas again asap. petrol is way too much. cheers.

[genIIIbandit]

thats the problem, a gas convertor is just that! it converts bottle pressure to burnable pressure, to do this it needs engine temperature water, if you have a water leak the convertor freezes and stops gas flowing through the convertor. solution; pull radiator out and get it fixed, then put v6 addiative, or genuine coolant back in and pressure test and bleed system. Coil negative is exactly that, negative from the coil, it tells the gas cut off that the car is running and then allows power to the gas lock off solenoid. If you have this problem again pour boiling water from the kettle over convertor. Just a point of advice, a motor is not suposed to use water or oil if it does fix it asap. hope this helps

[stackner]

thanx for all the help mate.

in regards to the water/oil leaking car its a dead car anyway LOL otherwise yes i would have it checked the second ANYTHING leaked but she is about ready for the graveyard. but till then i want the gas running instead of spending a fortune on petrol. cheers. ill try the hot water tomorrow.

[genIIIbandit]

just make sure ya havnt got air in the system, top up radiator, and start on petrol and undo bleed screw till thermostst opens, also have heater running flat out on hot till water comes out of bleed screw, then try changing to lpg, should fix it, ya only need boiling water when it freezes, ya shouldn't need it tommorrow

[stackner]

did all that exactly as you said but still the same thing. runs good on petrol but if i flick it to gas it stalls emediately and if i try to start it on gas it will start for a second and stall emmediately. and i could do that all day starting it on gas so its like a little bit is getting through? it was running fine on both petrol and gas prior to this though.

[andyli]

believe me it is the samll switch controling the gas and petrol under your steering wheel.

[defa]

gas would have to be the simplest fuel ever. i learned all about it when i was a youngster. when you turn the ignition on the solenoid should open then close, when you start it you tacho signal wire will power the safety switch which is like a relay i spose. then that will power the solenoid. fair chance the safety switche has shit itself and not opening the solenoid.. also make sure the solenoid is getting enough power to open. i have found sometimes when the solenoids get old they won't open all the time. but the second you put power from the battery it will open.. either that or andyli could be right.. just check everything just make sure there is power at the solenoid whent eh car is running if you can get it to run on gas..

[stackner]

thanx again for the help guys. thats the problem the car would not run on gas. it would start for a split second and emmediately stall.

but now.. it will start on gas and idle REALLY ROUGH but if you press on the accelerator at all (even full throtal) it stays at this REALLY ROUGH idle speed. infact when you press the accelerator it runs even rougher but still at an idle speed.....

[defa]

your convertor could be buggered. that would be somethign to check, but that does sound like petrol is running through at the same time too.. check to make sure fuel is not getting there too. i have never looked at a fuel injected car with gas properly, so i am not sure if the injectors get turned off or if there is a solenoid stopping the fuel from coming through.. i would be thinking the injectors would just be turned off and the fuel pump though..
just make sure everything is on and off when it should be while it is running.

[stackner]

well ive taken the converter off the car and looked at it. took it apart and all. BUT when i took it off the car i noticed something that seemed odd to me. there is a hose that runs from the converter to the air intake at my throttle bodie for the gas to enter the engine. when i took this hose off it had water in it and a fair bit of water at that. it also pured out the converter where this GAS hose goes onto it (from the water hoses too but to be expected) i am guessing this definetly means my converter is stuffed....... any ideas for getting a new (cheap) one? checked out ebay but i do not know what ones will work with my gas system ect. my system is by VALE.......

[stackner]

anyone? cheers.

[NVE_069]

mine did this but when i was driven i flicked it over to gas from petrol an it went bang. woulnd start on gas, but if i started it on petrol than flick it over while keepen the revs up it would but once i stoped revn it stalled, Anyway took it to the gas shop an it was a little hole on the glove thingy that goes on the air intake ill get a pic an show u giv me a min.

cheers

[andyli]

hi, guys, I am still a P plate and have been driving the VN for 15 months. got the car for 1300 with a lots of problems unfixed. spent 700 on sway bar fit, high pressure hose for Power steering, service, steering rack and the car goed fine for 4 months. went to canberra and very cheap on LPG. but during the 4 months I experienced stalling once which I did not take any notice. after that my nightmere started. the car keep on stalling for many times. later it is far more often that women's period. got two mechanics checked it and one of them put it on the computer and reset the gas converter, the other one just run the car without putting on the computer. all they said is I tuned it and now it is beautiful, (45 please, 27.5please respectively.). but the stalling never change. stalling on tbe highway several times urged me to change the gas converter. I was very happy after spending 300 for that and the car went fine for 5 days before the stalling come back again. funny it is that no one could tell me why the car do stall on petrol. I have to run it on the bloody petrol to save my life which was and is very costy and I have to spent 420 to fix the fuel pump and the injectors. (20 liters per 100k around town.) thank god there comes Holden special summer service (199), I sent the vn and got the service and also paid 95 to check it out why it is so thirsty. copy the result and found the petrol light and the LPG light come in the same time. showed the gasman and I think he immidiately understand where is the problem for stalling( or he already knew it before he changed my converter). but any way I trust him. so the small switch which control the gas and petrol under the sterring wheel which is 60 bucks make the gas and petrol enter the engine is the cause of stalling on LPG.

[azzfox]

later it is far more often that women's period.

not sure about your problem but that is a very unusual describtion

[stackner]

cheers stato. ill check stuff like that out tomorrow. still wondering about the water though. the low presure gas hose that runs from the gas converter to the engine (throttle bodie) to let the gas in the engine had water in it. i seriously suspect this is not ment to be and that i need a new converter...

[kirkson]

this happend to me a while back, turned out that one of the wires from the converter had come off, I just sliped it back on and all was wee.
regards kirk

[andyli]

it is a typing mis. should be far more often than .......