As others have said, it is lack of venting, but it can be due to different causes. While any drains within 4 feet of the toilet will vent easily through the main stack vent, kitchen vents will often be further away and need a separate vent stack up through the roof. In order to allow for more flexibility of fixture placement "back vents" are often used. These will extend upward in the wall to a height above the fixture drain and then horizontally to a main "through-the-roof" vent stack. Vents have no water flowing through them so they are not subject to plugging except by rare situations like frost build-up or birds or wasps etc. Sometimes where a back vent is needed it is not installed. retrofitting can be difficult but there is an option in the form of a "closet vent" or "vent check" which is installed under the sink by teeing off from the drain pipe. It has a light spring which keeps t closed until there is water trying to go down the drain.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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