Check the codes! Could be lambda playing up. I stripped the whole LPG system recently in my Bifuel twice recently. All hoses new, filters etc. I stripped my distributor cleaned and changed all parts exept stepper motor because mine is fine. I cleaned and resealed my non-oem evaporator! When I gave up I read the codes and it turned up that first lamda sometimes playing. I borrowed a lambda from another car and it runed like a dream for a week. Now need to buy one.
Is your car runs alright on petrol? I mean in the morning if it starts alright? A quick test can be done. You need to put your vacuum line from evaporator in to the water if bubbles come up - evaporator needs changing its seals. But you need to run on LPG for that test.
Buy some STP injector cleaner and pour it down the LPG line to engine. Start the car and try to turn it to lpg. It will stall immediately on switch over. Leave it overnight. In the morning turn it to LPG, it may stall a couple of times and a lot of smoke will fly from exhaust.
LPG definitely will need servicing. It is not hard and can be done DIY.
If there is still neck distributer you may wish at least to clean the inlet valve on the high pressure side. Beware of the liquid lpg escaping. When you will undo inlet pipe there will be a spring with some rubber and crap. That crap does not belong there and need to be cleaned.
If in unlucky event you still experience problems when running on LPG it is highly likely that you will need a new stepper motor that is volvo part only and cost like a whole car from dealers. CNGBifuel can possibly hook you up with some second hand unit that he used to rebuild a while ago and possibly still doing that.
There is multiple reasons for LPG not functioning OK and it is really hard to advise anything. I strongly advise to get yourself familiar with LPG systems and how they work as it can save you big money. Don't be afraid of LPG it won't explode suddenly unlike petrol. It is absolutely safe to work on the car outside and usually requires only basic knowledge of health and safety.
I wonder what exactly those LPG specialists has been doing to it.
Good Luck
P.S. Worth checking electromagnetic valves both front and rear before starting to do anything else.
|