Originally Posted By: sunfire
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I'm going to try a gallon of boiling water through a basketball needle next time.
Why boiling water? The low pressure in the manifold may cause the water to start boiling anyways. I think the carbon is removed when the water turns into vapor. If the water is already in the vapor state (steam), it might not work as good. I wouldn't know whether hot, cold, or room temperature water would work better, but I would just stick to room temp water. I do know that more carbon is removed by water when the engine is under a heavier load like going up a steep hill, in low gear, with a lot of weight in you vehicle. I use to have an Edelbrock Vera-jection and my pistons always look new.