Smoke Test

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Moderator Post (s) for this thread: > Questions: by homebild on 04/22/2008 > House Trap by homebild on 04/22/2008 > House Traps are Largely Prohibited by homebild on 04/22/2008 > A few things by Handyman on 05/05/2008 > These valves by Handyman on 05/06/2008 > Washing machine drain by Handyman on 05/08/2008 > The toilet or sink nearest the by Handyman on 05/08/2008 > Glad to hear by Handyman on 05/19/2008

You still have not come back with an answer to the smoke test that makes sense.

However i am not out of ideas.

Do you have a sump pump? It may be giving off a smell similar to sewer gas.

Do you have a defective "Air admittance valve"?

http://en.wikipedia.org/wiki/Plumbing_drainage_venting

Here is an image:
http://www.plumbingstore.com/autovent.html

If one is letting the gas flow out that could cause the problem. Or if it has no flow at all.


Some other ideas:

When your washing machine drains do you see or hear any "burps" from the toilets or sinks?