Go Back   iRV2 Forums > MOTORHOME FORUMS > MH-General Discussions & Problems
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 09-28-2012, 09:42 AM   #1
Junior Member
Join Date: Sep 2012
Posts: 1
Problem with toilet odor

We have a '97 Discovery mtrhome...and we cannot seem to eliminate toilet odors. Does anyone have any suggestions for this problem? Is it a common problem with Discovery motorhomes, or???

joycew2313 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 09-28-2012, 10:03 AM   #2
Senior Member
mikf's Avatar
Winnebago Owners Club
Join Date: Jun 2010
Posts: 499
is this a new problem? does the toilet bowl hold water between flushes? if not you need to replace or clean the seal. do all of the traps have water in them? do you have a washmachine hook up? no I do not think it is a common problem with your Discovery. you just have to figure out how the smell is escaping the tank. is the toilet secure to the floor or does it wooble?

Mike S.E. Ohio
mikf is offline   Reply With Quote
Old 09-28-2012, 12:15 PM   #3
Senior Member
Skip426's Avatar

Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 11,949
Sorry your in with a problem right off the bat.
Black and grey tank odors are the bain of RVers existance. The problems can exist from the factory; poor plumbing joint assembly; or be the result of wear and tear on the systems over time.
As, mikf, asked is this a new problem or is the coach new to you?
Does the problem take a few days to develop, or is it constant?
Are you hooked up to services or are you boondocking?
Tried anything yet ?
Checked the tank venting, through the roof ?
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 09-28-2012, 05:28 PM   #4
Senior Member
Tony Lee's Avatar
Join Date: Sep 2012
Location: Peru heading for Brasilia, Brazil
Posts: 1,869
Could be a grey water tank problem - often due to the fitting below the bowl staying open and letting the odours escape.
Tony Lee - International Grey Nomad. Picasa Album - Travel Map
RVs. USA - Airstream Cutter; in Australia - MC8 40' DIY Coach conversion & OKA 4x4 MH; in Germany - Hobby Class C; in S America - F350 with 2500 10.6 Bigfoot camper
Tony Lee is offline   Reply With Quote
Old 09-29-2012, 11:39 AM   #5
Senior Member
Workhorse Chassis Owner
Join Date: Jun 2003
Location: Palisade CO
Posts: 3,393
Tony is right, that is a common problem.
The fitting is called an air admittance valve and it prevents the water from being sucked out of the traps by opening and allowing room air in the line. If the flap sticks in the open position, gray tank odor can enter the room. Gray water can smell as bad if not worse than black.
The valves are usually hand tight and can be unscrewed pretty easily. It is on a stub that is connected on the sewer side of the trap on the sinks.
Replacements can be bought at many hardware stores.
Clay WA5NMR - Ex Snowbird - 1 year, Ex Full timer for 11 years - 2004 Winnebago Sightseer 35N Workhorse chassis. Honda Accord toad.
Clay L is offline   Reply With Quote
Old 09-29-2012, 11:43 AM   #6
Senior Member
JayGee's Avatar
Fleetwood Owners Club
Ford Super Duty Owner
Join Date: Apr 2001
Location: East Tennessee
Posts: 333
I started using this and the odor went away. Odorlos Waste Chemical - Product - Camping World
And as others have said make sure you keep water in the toilet bowl.
Foothills of the Smokies
2005 Bounder 35E
JayGee is offline   Reply With Quote
Old 09-29-2012, 01:14 PM   #7
Senior Member
bonzocfi's Avatar

Newmar Owners Club
Join Date: Sep 2008
Posts: 364
Chemicals, in and of themselves, will not eliminate odors. Had one problem with an AAV under the sink in the bathroom (replaced valve - problem solved). Have never used chemicals. Make sure there's water in the toilet bowl/p-traps and your vents will take care of the rest.
2005 Dutch Star 4009 - 2006 Toyota Tacoma or 2013 Jeep Grand Cherokee

bonzocfi is offline   Reply With Quote
Old 09-29-2012, 07:12 PM   #8
Senior Member
mgscott4's Avatar
Workhorse Chassis Owner
Join Date: May 2009
Location: Kansas City, MO./Pollock, LA.
Posts: 1,525
I installed this and it works great. I would start to get odors after 4 or 5 days after dumping. I would get the odors when I flushed,
No odors since I installed this.

Lil' Stanker™ In-Line Deodorizer Fans
06 Hurricane 34FT WH W20 Chassis 8.1L 120K, Steersafe, Koni Shocks, DIY Trac Bar, Tri-Metric 2025RV Battery Monitor, 4-6V Batteries, Scan Gauge 2, Crossfires, 735W Solar Morningstar MPPT-60, KVH R5 In-Motion Sat, XM Radio, 07 Chevy Malibu Maxx Toad, Falcon 2, Brake Buddy, Escapee
mgscott4 is offline   Reply With Quote
Old 09-30-2012, 04:05 AM   #9
Senior Member
Join Date: May 2009
Posts: 463
If you get them going down the road make sure your roof vents are closed. If open they'll suck the smell up out of the toilet and the sinks.
Doug and Cassi
'05 Itasca Meridian 36G
'99 Jeep Wrangler
OldChief7155 is offline   Reply With Quote
Old 09-30-2012, 05:56 AM   #10
Community Moderator
"007"'s Avatar

Nor'easters Club
Workhorse Chassis Owner
iRV2 No Limits Club
Join Date: Oct 2004
Posts: 24,415
Welcome to irv2
After checking the previous posts maybe you need new vents that are under your sinks the rubber may have dried out and needs replacement.
If your toilet bowel doesn't whole water the seal needs to be cleaned and always make sure there is water or RV anti freeze in bowel to prevent a dried out seal during winter months.
98KSCA, 99MACA, 03 KSCA-3740- 8.1 Chev-- ALLISON Trans, now in good hands
"007" is online now   Reply With Quote
Old 09-30-2012, 06:14 AM   #11
Senior Member
tims52ford's Avatar
National RV Owners Club
Nor'easters Club
Join Date: Jul 2008
Location: Pawtucket, Rhode Island
Posts: 203
If all else fails, remove the oem vents on the roof an replace them with cyclone vents. Had the same problem, replaced the oem vents no more problems.
tims52ford is offline   Reply With Quote
Old 09-30-2012, 01:03 PM   #12
Senior Member
Damon Owners Club
Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 21,174
Questions: Are you using chemicals in the black and gray tanks? Stop.

Are you hooked to a sewere system and leaving the dump valves open: Close them.

Finally a suggestion:

Odor is more a problem with the gray tank than the toilet. Under the sink (Both kitchen and bath) may be a vacuum breaker, it can fail and let sewer odor back into the room.

Home is where I park it!
wa8yxm is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 08:01 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.