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Strange Tub/Toilet interaction

768 Views 2 Replies 2 Participants Last post by  vanda1
My home is about 7 years old. The toilet in the master bath is just on the other side of the wall from the tub. Two months or so ago we replaced the toilet guts and the toilet seems to work fine now. However, we now have a new problem: Every time the toilet is flushed, a gurgling noise is heard in the tub. Worse, after a few flushes, sewer smells come from the tub drain. Running water down the tub drain instantly removes the smell, but after a few flushes, it comes back again. What is happening and how do I fix it?
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Sounds like things weren't properly vented, OR there's no trap on the tub/shower drain. Is this bathroom on the first floor, and are the drain pipes visible in the basement ceiling below? If so, take some pictures so we can see how it's plumbed.

If there's no vent on the waste arm for the tub, then the big slug of water that passes by that branch when the toilet is flushed can suck the water right out of that trap.
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