1) When flushed, the water drains from the bowl, then it stops draining and fills up partially, it then 'finishes' flushing and drains normally before refilling.
2) During the partial bowl refill and when 'finished' flushing, the water in the bowl initially has frothy bubbles on top, as though there is air being incorporated...but they disappear in the time it takes the tank to fill.
Things I've checked:
> lifted the tank lid during flush to ensure water tube is in pipe
> ensured 'flap' is up completely during flush and closes during refill
> when toilet not used for period of time, water does not drain/leak from bowl down sewer line
> as an aside...after reading other posts I thought perhaps an occasional sewer gas odor in the living room might be a sewer venting problem, which might in turn be the problem with the toilet flushing? I don't know where either toilet vents-attic or roof...will check to see if blocked.
Anyone more experienced than this newbie have
any words of wisdom?
P.S. The other toilet flushes fine; the sewer line (I assume that's what it is) in the crawlspace form a 'Y' where the two join and proceed underground to drain into what I'm guessing is the main sewer line. No leaks noticed.