Bathroom Sink P-trap backup and glug sound "un-vented"

[Dave1017]

i recently installed a new bathroom sink with a p trap. As soon as I turn the water on the sink starts to backup and the water drain very slowly. When it is done draining it makes several glug glug sounds. There are no clogs. I would assume it is air in the line, but how do I fix it? It's 1-1/2 inch pipe and trap. Could it be bad positioning or size?

 

[Reach4]

Can you lift the stopper out temporarily? How does the sink drain then?

Your lack of a vent is more likely to cause a sewer smell, due to the trap emptying out, than to cause slow draining.

You might have a clog.

 

[Sponsor]

 

[JerryR]

Can't see that the line is vented? If not then perhaps an AAV
"Typical signs you need to install or replace an air admittance valve in your plumbing system, is bubbling or gurgling in the drain pipe or slow draining fixtures."

 

[Dave1017]

Thanks. I'm pretty sure it's not a clog because it happens so quickly and I pulled it apart and snaked it. I'm think an AAV if all else fails. The guy who moved the drain might have moved it just a little too far from the vent.

 

[Cacher_Chick]

The vent take-off cannot be below the trap arm.

 

[Terry]

It needs a vent.

 

[hj]

He may have double trapped the drain, because the mere fact that it is NOT vented would NOT prevent drainage, but WOULD cause gurgling AFTER the water drains. An AAV would be completely useless for this problem.