or a blocked vent. the KS may be the closest place that the line can vent when the washer discharges. can you access the vent for the washer from your roof? it should pretty much be right above the location of the laundry. if you can, then take a water hose up on the roof, shove it down teh vent pipe and turn it on full force. push it down until it reaches ground level or lower. it should push the bird's nest/bug nest/whatever right thru.

There is no roof vent above the washer. My kitchen sink drain is the closest drain to the washing machine.
This is something that has gone on for a while. Just the past few months it has gotten worse.
The only vent pipe I have is along the back of my house outside the bathroom. All it is is a piece of PVC pipe. It runs about half way up the outside wall. Nothing as high as the roof. Can I run a hose down that?
Thanks

Pipes are getting clogged.

Our setup is the same, kitchen at the end, washing machine in the middle of the run. Kitchen was extended without new vents, original vents were disconnected. Kitchen was gurgling with every wash load. I replaced 20' of galvinized drain with PVC and most of the gurgling went away.

I am just bumping this up for an answer.
Since the closest thing I have to a vent is the PVC pipe running about 6 ft up the outside of my house. Can I still put a garden hose down as suggested?
Sometimes the kitchen sink even has water backing up into it as my washer drains.
Thanks for all the suggestions. I am hoping to hold off on phoning my plumber.

hendricus, my kitchen is not at the end of the run (if that matters) it is in the middle. Laundry room, kitchen, and the the 1 and only bath.
If anyone understands my babbling I'd love your feedback.
TIA

In any event, I wouldn't live with this for as long as you have. If you haven't been able to to diagnose and cure this, for heaven's sake call a plumber and get it resolved. If you're smelling the sewer gas, you may have a real hazard as well an annoyance at hand.

you HAVE to have at least 1 vent run up thru the roof.

you should call a plumber, cause something smells fishy here.

"Kitchen was gurgling with every wash load. I replaced 20' of galvinized drain with PVC and most of the gurgling went away."

If the installation was correct ALL the gurgling would go away.
The vent for the laundry prevents suctioning off the upstream traps by providing an air path as the water from the laundry moves towards the main line.

Thanks for your answers. I'll call the plumber ASAP.
I guess we have been pretty lucky thru the years. There has not been a vent above the roof for close to 10 years. As for the sewer gas I notice it more than anyone else, but I know its there.
Thank you!
Dawn

I had sewer gas smell in my house. It was VERY bad in cold weather at night. The cause was roots growing in my outbound sewer line before the pipe meets the main sewer at the street. First plumber put camera down toilet pipe. He saw roots in the line. The plumber put the snake down the toilet and removed a lot of roots from the pipe going from the toilet to the street. The sewer gas smell is completely gone after that. Afterwards I put copper sulfate down the toilet to retard future root growth. You can buy copper sulfate at a hardware store. First the snake has to be put down the toilet to cut and remove roots that have gotten into the pipe.

.I have a gurgling toilet and sewage smell from same bathroom under sink cabinet and Ive had 4 plumbers. .... get your info from google, these forums and others opinions first...so you can direct the plumbers qnd have tried things yourself before you pay a plumber who tells you to poor vinegar and soda down your sink for 300.00