Here's the deal. 2 story house. Upstairs bathroom is right above downstairs bathroom. In the downstairs bathroom you have; sink-toilet-shower-cleanout outside. Downstairs toilet and sink drain slow. Snaked line through vent to clear clog and also ran smaller snake through sink drainline. The sink drain line goes horizantal and ties into the vent for the toilet. I can hear the snake. Here's the kicker; the sink drain great now no matter what. The toilet will flush great for 2-3 flush but after that will back up. BUT, if I run the sink while I flush the toilet it won't back up. I filled half a 33 gallon trash can w/ water and poured it in the toilet w/ no running water. Started to back right away. Turned on the sink and it drained great. Running the shower has no effect on the toilet.
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toilet won't flush