sewer smell in kitchen when it rains

[snp1975]

I am having a problem where I smell sewer gas when it rains heavily for 2 or more days at a time. I live within the city limits. It is a very strong odor coming from the behind the kitchen sink (open floor plan here). Initially,the smell was coming from under the kitchen sink and behind the kitchen sink. A plumber placed a studer vent on the pipe under the sink and cut the pipe behind the sink and put vent on it. This did not work. Then he came back cut and capped the pipe behind the kitchen sink which didn't work. Next he ran a camera through the pipes to check for any cracks or tree roots being in my pipes. The pipes were fine. Next he recommended getting a smoke test (which was quite costly) and I terminated his services immediatly! A family friend, who happens to be a retired plumber, recommended that I turn on my diswasher and flush the toilet in the guest bathroom weekly to help prevent the problem. He also rec that I put draino down the bathroom drains, kitchen drains and the drain behind the washer. This has also been ineffective. Any suggestions or rec's? I have been having this problem for approximately 2 years and I have spent a pretty penny getting repairs from plumbers that never work. Any assistance would be greatly appreciated. Thank you in advance.

[pushkins]

All drains in a home have P Traps/water traps, it's that little "S" bend you see under your sink. This P trap traps a little water in it to stop sewer gasses coming back up the pipes, about the only way the gas can come back is if one of these traps drains of it's water.
A cracked pipe (downstream) of the P trap might let gas through but you have already checked for that.
Flushing toilets does little for sewer gas smell all your doing is flush water through the pipes, it's not the pipes that smell, it's the gas in the sewer.
Check to make sure water is remaining in the P Trap nearest the smelly area, it could be that the trap is draining a little too much allowing air back past.

[Redwood]

It does sound like you have a pipe that is leaking sewer gases as long as the traps are in place holding water.

Peppermint oil mixed with hot water and poured down the roof vent could verify this fairly cheaply. The house needs to be closed up with people inside to check where the smell comes from. The person mixing and pouring the peppermint oil and hot water mix must stay outside the entire test. As that person will be unable to detect the smell and bring in the smell with him.

If you smell the peppermint then the pipes are leaking sewer gases and you may be able to pinpoint where it is coming from. If you cannot then I would recommend going ahead with the smoke test.

[snp1975]

sewer smell in kitchen

Thanks so much for your assistance. I will try both of these rec's.