Posted by David L on February 10, 2008, 12:15 pm, in reply to "Re: lpg problem"
203.17.42.10

Hi Peter, Had exact same prob about 5yrs ago. 74 RR with Chev on gas. Ignition switch internal contacts worn out. Mine even used to start with the same 'flick' of the switch as yours. Intermittant prob. Confirmed by hot wiring to start, which is what you are doing. Was also temp dependent. Pulled the switch apart and put new dimples on copper contacts which worked for a couple of years. Got another switch in the end. All good. good luck, DL --Previous Message-- : : Peter : Suggest looking at the electrical : connections on the lpg. : ie Both the +12 volt and the earth : connections which often corrode enought : to cause problems. : I prefer to use a small light globe : with a couple of wires soldered to it. : Connect one end to a good earth to : check the +12 volt items with the : other. Payes to have a sharp tip to : connect to probe with. Corner of a : screw driver or sharpened nail. Can be : worth taping up the metal object. Any : tape will do. : Earthy connections are checked by : connecting one end to +12 volts and the : probe on ground will be bright for a : good earth. : Find one has 3 states. : OFF ie no light : 12 volts ie bright light : in between ie usually one is powering : up something through the globe. : : By the way : Had a similar frustation on a single : mixer set up. Turned out to be the : economising valve which was between the : evaporator and : the mixer. This had a stripped thread. : Is there such an item on yours. : Cheers : Tim_m : : --Previous Message-- : Hi all : : 85 BA duel fuel IMPCO system Twin carb : Twin Mixers Twin tanks . : : This is not from cold , it has to be : primed to start from cold , the problem : occurs when it is warmed and also often : when air temp is higher , it`s : intermittant and ongoing for a couple : of years . : : Every now and again but not of late and : even in the heat , the car won`t start : on LPG . : : It generally fires once and won`t start : when it occurs . Similar to when a : rotor is playing up . : : Other times it will it will run for : 5/10 sec and stop and not restart . : : Then other times it`s dead as a door : nail , winds but won`t start . : : It`s only ever happened twice after : refueling . : : The norm is the key is barely turned : and it fires , just sort of flicked on : and it fires , there is nothing wrong : with the start system . : : I can find no faults with the lpg : system or electrics related other than : the way i can start it when the problem : occurs . : : The way it can be started is by : disconecting the solenoid wires and : jumping a power wire to the main fuel : line solenoid at the converter . : : If i do this it will wind over for : around 5 seconds before it will start : but it will always start . : : If i don`t do this it can be wound over : for as long as you feel like , it can : be left and gone back to for 10/15/30 : minutes and it may or may not start . : : The way this part of it works is : similar to an EFI fuel pump , there is : a computer , it`s not the normal type : saftey switch ( well it`s called a : computer don`t know what`s in it )under : the dash so what i`m doing is like : jumping a power wire to an EFI fuel : pump . : : Sorry about the length but it`s a bit : hard to explain otherwise . : : Any ideas ? : : Cheers , Peter : : : :