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Gas change over

2K views 12 replies 5 participants last post by  EFFalcon 
#1 ·
I've got an EF series 2 Falcon GLi on factory fitted gas (not tickford) and its got one of those 'start on fuel, change over when temp is right' type things on it, which can be annoying as it usually changes when i'm sitting at an intersection and just put my foot down, it changes over and the car cuts for .5 seconds and goes again, the problem is, sometimes it stalls when it does this (happened about 2 times in the past 2 weeks) now i want to know if its changed over by a temperature type switch? and is there anyway that i can maybe adjust it so it will change earlier or something along those lines?
 
#2 ·
I have heard of systems that change over after a period of time (usually a few seconds from what I understood), but not based on engine temperature. I'll PM Bass_Crazy in case he has any ideas.
 
#3 ·
Its deffinately not a time thing, if i start the car after its been driven, say i go up the shop, go in, come out and go again, it'll change over pretty much as soon as i start to go again, but if its in the morning, it will wait about 10 mins or so before it will change over, thats what makes me think its the engine temperateure, and it will wait for me to rev the engine a little too.
 
#4 ·
Most LPG systems will start on petrol but only for a couple of seconds until the engine fires. Never heard of a temp related change-over. I've got an NF V8, and I can't really tell when it is changing over as it is pretty well instantaneous.

How can you tell it is changing over? If the engine is hesitating, it could be something else than a gas change-over.

Cheers
 
#5 ·
1. The switch on the dash changes later (as seen by the lights)
2. The car cuts the engine for about .5 seconds, just like what happens when u change a car's fuel while moving.
The ford dealership said it was the change over.
 
#6 ·
Right, so in the morning, you have it set on gas. It starts, then goes to gas automatically, I can't tell when it changes. I can't even tell if I switch when driving, no hesitation at all. Must be your system.
 
#7 ·
yeah, ihave the switch set to Gas, and the car starts on petrol, the light on the switch stays on the petrol setting, after a while, the car will cut for about half a second and the light will change to show its on gas, its all automatic, the change over will genereally happen as i put my foot down, either after an intersection or something along those lines.

last time i changed the car from petrol to gas manually while the car was idling, it stalled.
 
#8 ·
No, I don't know. I have an after market system fitted with the switch under the dash. Your push button setup is controlled by the EEC V system, which swiches over to gas "after a pre-determined time, usually 1-2 seconds" so I don't know what's wrong, but according to the specs, it should change over to gas in a couple of seconds after starting.
 
#9 ·
Its not a simple button, its a switch.
And i have been told by a ford dealer that it doens't have a timer, I found this out when i had it serviced, they said it was normal, but all i wanted to know if there was a way for it to be tweaked or anything.
 
#11 ·
i originally thought so, but that wouldn't explain the differences in change over that i've been getting, it might not change for 10 mins if it hasnt been driven on that particular day, where as if its been driven then parked, then driven again, ti'll do it wihtint 1 min of starting
 
#12 ·
hmm.. I've never heard of a system going off temperature before.

Most common are the time delay and rpm switches, as mentioned above.

I'm pretty sure there should be an adjustment on the module if it's aftermarket, as it was most likely designed to work on a wide range of cars, giving a wide tuning range.
If you cant figure out how to adjust it (usually a variable resistor on the module) go to a local gas specialist and they should be able to do it for you.

Another option would be to change the module to a time delay or RPM switch, which ever suits you most.

My EA had a new time delay module installed a few years back and it was about $50. Simple to install, only 3 wires.

Oh and as for the stalling when you change form ULP to LPG. It is because of the position of the mixer. When you flick the switch, the injectors are shut off, and the gas solenoid is opened. By the time the gas travels up the pipe, into the mixer, down the manifold and into the chamber, the car will stall if its at low revs. In other words, keep the revs up a bit.

Talk to a gas specialist about your system, not Ford.

Good Luck.
 
#13 ·
Ok will do, thanks a lot for your help, the system was installed by Freeway Gas, which is owned by Freeway Ford in cranbourne, so it was a semi-factory fitted gas system i spose, i'll see if they're stil around and goto them for help on it.
see what happens now i spose :D
 
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