Your toilet may gurgle when flushed due to a blockage in the plumbing system, such as a clog in the pipes or a venting issue. This can cause air to be trapped in the pipes, leading to the gurgling sound when the toilet is flushed. It is important to address this issue promptly to prevent further plumbing problems.
When the toilet is flushed, it creates a sudden change in pressure in the plumbing system. This change in pressure can cause air to be sucked into the drain pipes, leading to the gurgling sound in the tub as the air escapes.
Incorrect pipe size installations
Your drain line is plugged somewhere after your shower and toilet line are connected. The reason for the gurgle in your toilet is because air is trapped in the drain and your toilet is the closest place for air to flow to. If you had a vent on your toilet trap arm then it would gurgle in the vent rather in your toilet but your drain is still plugged and needs to be snaked out and maybe your drain line needs to be examined for right grade or broken.
When you flush the toilet, it can create a change in water pressure in the plumbing system. This change in pressure can cause air to be sucked into the pipes, which may result in the shower gurgling as the air escapes.
Flushing the toilet can affect the water temperature in the shower because both the toilet and the shower are connected to the same water supply system. When the toilet is flushed, it temporarily reduces the amount of water available for the shower, causing a drop in water pressure and potentially affecting the temperature of the water coming out of the shower.
When you shower, the water going down the drain can create a vacuum in the plumbing system, causing air to be pulled in through the toilet's trap, which results in the gurgling sound.
Run a new cold supply line from the source. This will drain less pressure from the the cold shower line.
When the toilet is flushed, it creates a sudden rush of water down the drain pipes. This rush of water can create a vacuum effect in the plumbing system, causing air to be sucked in through the bathtub drain. This air passing through the water in the bathtub can create a gurgling sound.
The drain is plugged somewhat between the upstairs and downstairs. Need to snake the drains.
The drains for the shower, toilet and sink all connect to a common line. Assuming the toilet is not backing up, the problem indicates that there may be a partial blockage, enough so that some of the toilet flow is backing up through the shower drain line. You need plumbing repair. The shower leak you mention should only be in the shower, or else you have a broken drain line as well.
Check you vent stack connection inside the house. Gurgling may have been caused by a clogged vent stack not equalizing the pressure. Now that gurgling has stopped it is getting air. Start your checking there. ----HYPOTESIS The shower drain in a spare bath gurgled when the toliet flushed or the sink water drained When the shower was used it leaked to the ceiling below. Now it does not gurgle -How do we find the leak?