Probably because the line is still at least partially clogged.
It is clogged. Where? It depends. Usually when any water working thing in a household is clog, it can be solved in the main water pipe. ================== Here is a good plumbing layout in a bathroom - http://www.cornerhardware.com/articles/art51.htmlWhen the toilet flushes, the rush of the water down the pipes creates suction. This pulls the air thru the roof vent. If this vent is clogged (by bird's nest, snow etc), then the air will be sucked in from the bathtub drain. This is what is causing the gurgle sound.
The toilet itself is plugged or the pipe from the toilet to the drain is plugged. It may be that the tub and sink have their own drain pipe that may connect to the main away from the toilet drain. Plunge the toilet or sometimes if you fill a 5 gallon bucket with water and pour it into the toilet as fast as it will take it, that will flush out the line. It is a greater amount of water all at once an forces out what the clog is.
Often a toilet will gurgle after flushing for one or more of the following.1-the drain line has a partial blockage2-the vent line has a partial blockage.3-the toilet itself has a partial blockage.4-Incorrect installation of sewer/vent toilet lines.There are a couple of other rare circumstances that may cause this, but the majority is related to the above. If the toilet is able to flush and no signs of slow draining or back up, then it is most likely the vent line that is obstructed.Sounds like verbatim what I had posted over a year ago
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