Thread: P38A engine stalling at idle

Hi Glen, just a wild thought:

In an earlier post you implied that the problem occurs when the engine is below operating temp : so, given that the vapour point of LPG is lower than for petrol am wondering if you are getting ice buildup at idle due to the generally high relative humidity of SE Qld.

Also, the LPG system is not a sequential fuel injection type?

Got me thinking about problem icing which can occur with the carburetor on piston engined aircraft, e.g. throttle reduced on descent in high rel humidity conditions... solution is to pull on "carby heat" which directs warm air into the induction system thereby reducing the relative humidity of the air supply.

With the Thor setup on LPG, does it stall when the engine is at full operating temp?

Given it's not gas injected, perhaps after running rich there might be some other form of metering device which needs cleaning hence the gradual deterioration in performance?

cheers

Find out where the oxygen sensor feed is cut, reconnect the sensor straight to the vehicle ECU and disconnect the emulator output. This way you rely on the gas processor functioning in closed loop and cycling the mixture. Straight 0.45V is useless as an emulation value. It should mimic petrol operation.

Find the injector cut wiring, solder a 68 ohm 1 watt resistor between the 12V in and out wires. This is quite adequate in my experience to allow a small diagnostic current to flow without opening the injectors on sequential injection, including D2's. Don't ask me where exactly these wires are, I don't like the AEB system and won't use it. You should be able to identify the injector cut wires where they cut into the main loom's positive injector feed, brown with orange stripe wires.