Quote Originally Posted by niky View Post
I'm doing testing and observation right now... I've been discussing this (offline) with Ghosthunter at length, and we're theorizing it has something to do with vaporizer pressure and temperatures at idle.

When the car is idling, there will be times that the thermostat will close as the coolant temperature gets lower... this will cause a change of flow to the vaporizer, and a change of vapor pressure... or... if the car just gets cooler in general, this may cause the vapor pressure to drop... will try to do instrumented temperature testing... it might be that for people with this problem, a second vaporizer or an upsized vaporizer would help... discussed with Speedlab also the possibility of an electric heater on the vaporizer, but that's an idea for the future, for customization.

I notice the loss in performance, too... but after a few minutes of hard running, the power comes back. That's why I suspect it's a loss of vapor pressure due to cold conditions (at least on my car).
I was also having the same problem, the most Mike did was set the vaporizer at the middle setting and he instruct me to adjust the diaphragm either clockwise or counter clockwise to find the most appropriate setting. What I noticed was I can only adjust it to 7 turns from zero or else engine will die out of overwhelmed fuel injected, but from zero to 1/4 turn and up to 6 turns engine will run okay but intermittently having idling drops and sometimes will stall. GreenFuel already replace my injector rails in anticipation that this is causing the problem but I guess it is not in my observation.

I see no difference in engine performance doing 1/4 turn on the diaphragm or even up to six turns but this puzzle me. Could I have a defective vaporizer diaphragm?

What bothers me was sometimes when I'm idling at traffic sometimes the engine dies out on LPG but not on Gasoline. I would need to run hard to gain normal idling again?

Some LPG vaporizer on the net has pressure sensor and even the injector rails has pressure sensor.

Please let us know if an upsized vaporizer will solve this.