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Greetings,

I have Subby outback 2000 2.5. Now I have driven this car in Europe for over 4 years mainly on LPG. I noticed that after start in the morning when waiting on a traffic lights, the RPM will drop to less then 500 and from time to time the engine will stall. I noticed that every morning when engine is cold, after few minutes of running, I will have this symptoms on first traffic lights ever day now.

After running longer for 10 minutes when the engine gets, I guess normal operating temperature, it is fine and will not stall. The RPM will stay at normal level on traffic lights. As I mentioned I drive the car on LPG. First I observed that on LPG after the engine switches from Gas to LPG and thought it is related to LPG but to eliminate LPG from the equation I drove the car on Gas all the time and has same symptoms while driving on Gas, although I must say less frequently. But no matter on what fuel I drive, it will stall on my first traffic lights. Then it will be fine, I will manually switch to LPG and it is fine on next traffic lights.

Any idea of the issue? Perhaps some temperature sensor, some vacuum? I would appreciate your advice. Hopefully no need to change any parts/sensors as I will need to be importing from USA.
 

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Since it's temp related, 1st thought is Coolant temp sensor. If it's giving a "warm" signal to the ECU, the ECU goes in to closed loop and the resulting fuel mixture will be too lean.

I may be wrong but, the reason it would do it less on Gasoline vs LPG is the Higher BTU potential of Gas.
 
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