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January 8th, 2009 03:05 PM #11
It is likely you are getting an intermittent sticky Valtek rail injectors due to oily LPG contamination. One sign that your Valtek rail is failing was the rubber hose from the reducer/condenser to the injector rail was slightly bulging (medyo maga).
If you will notice, once they service your kit; they will remove the hose going to the rail and at this instance the actuators will get rested and will flex back to its original position, freed from getting stuck. Filter cleaning will also help, but it seems base from my experience, hose dismantling and re-installation alone helps restore injector's pistons to normal positions.
Another sign that you are getting oily LPG was your spark plugs will have black carbon deposits. A clean LPG fed into the engine will yield only powdery white deposit on the spark plugs.
Note: Slowly bleed bulging LPG hose before removal by loosening the clamps and slowly rotating the hose back and forth to avoid loud gas pressure noise.