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05-11-2019, 08:33 PM
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#1
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Junior Member
Join Date: Sep 2013
Posts: 6
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Banks Exhaust problem
We have a 2003 Dolphin, 496 motor, with a Banks Exhaust system. The right side keeps burning out the O2 sensor. The mechanic seems to think it's something to do with condensation from the exhaust. He's saying it's Banks that needs to do a fix, Banks says no. Any ideas?
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05-11-2019, 08:55 PM
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#2
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Senior Member
Join Date: Jul 2012
Posts: 2,565
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Could be the location of the sensor. May need to be higher on the pipe/header to keep dry.
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05-12-2019, 07:24 AM
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#3
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Senior Member
Texas Boomers Club Holiday Rambler Owners Club
Join Date: Jun 2002
Location: What? Like right now? ;-)
Posts: 1,302
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yep, if it is at a 90degree angle (or lower) it will get more moisture . Common problem on ethanol tuned cars with less than quality exhaust designs.
__________________
2003 Scepter 40PDBB - Roadmaster RR8S - Cummins ISC350 - purch aug16
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05-12-2019, 08:40 AM
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#4
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,704
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Which Banks exhaust package is it? The full kit with headers, or "Cat Back" only. For the full kit, you may have cause to blame Banks, but Cat Back, probably not.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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05-12-2019, 08:41 AM
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#5
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Registered User
Join Date: Nov 2015
Posts: 784
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Quote:
Originally Posted by OldschoolDW
We have a 2003 Dolphin, 496 motor, with a Banks Exhaust system. The right side keeps burning out the O2 sensor. The mechanic seems to think it's something to do with condensation from the exhaust. He's saying it's Banks that needs to do a fix, Banks says no. Any ideas?
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what's a 496 motor?
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05-12-2019, 12:22 PM
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#6
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Senior Member
National RV Owners Club Workhorse Chassis Owner
Join Date: May 2000
Location: California Central Coast
Posts: 2,034
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8.1 liter as in Workhorse.
Glenn
__________________
2006 Sea Breeze LX 8341 on a Workhorse W22 Chassis with 22.5 Alcoa Alum wheels,
2011 Chevy Colorado 4X4 with Ready Brake
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05-12-2019, 12:48 PM
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#7
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 54,785
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Hi ! Welcome to IRV2! We're sure glad you joined the gang! 
I can't add to what others have said but noticed you are kinda new on IRV2 and wanted to say hello! Have fun and keep her between the ditches!
Good luck, happy trails, and God bless!  
__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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05-12-2019, 06:25 PM
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#8
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Senior Member
Join Date: Aug 2016
Location: Pa
Posts: 648
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Is your mechanic absolutely sure it is a moisture problem? My neighbor has the 8.1 Chevy Workhorse chassis and I helped him install the Banks headers two years ago. I know he has over 10,000 mi on this system and has had no problems. If your mh has a full dual exhaust system, I would have the catalytic converter checked for partial blockage on the side burning the 02 sensor out
Tom
__________________
2004 Coachman Santara 3480DS Workhorse w-22 Ultra Rv tune with Banks headers, Koni shocks
Retired OTR driver ATA 5 million mile safety award
USMC Vet 1968-1972
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05-12-2019, 10:33 PM
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#9
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Junior Member
Join Date: Sep 2013
Posts: 6
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C
at is brand new, mechanic can't come up with anything besides the moisture.
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05-12-2019, 10:35 PM
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#10
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Junior Member
Join Date: Sep 2013
Posts: 6
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Yes
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05-13-2019, 02:15 AM
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#11
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Senior Member
Forest River Owners Club iRV2 No Limits Club
Join Date: Jun 2017
Posts: 1,057
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Any chance you have bad head gasket and burning antifreeze on that side. It would explain why only one side is doing it.
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05-13-2019, 08:47 AM
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#12
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Senior Member
Join Date: Aug 2016
Location: Pa
Posts: 648
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Quote:
Originally Posted by OldschoolDW
C
at is brand new, mechanic can't come up with anything besides the moisture.
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The thing that baffles me about the moisture diagnosis is the 02 sensors are mounted in the "TOP" of the pipe that connects the Banks header to the existing exhaust system. They are in the top aren't they
__________________
2004 Coachman Santara 3480DS Workhorse w-22 Ultra Rv tune with Banks headers, Koni shocks
Retired OTR driver ATA 5 million mile safety award
USMC Vet 1968-1972
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05-13-2019, 11:01 AM
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#13
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Junior Member
Join Date: Sep 2013
Posts: 6
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Quote:
Originally Posted by nvs4602
Any chance you have bad head gasket and burning antifreeze on that side. It would explain why only one side is doing it.
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Nope, no chance, it doesn't use water, & mechanic checked that.
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05-14-2019, 11:18 AM
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#14
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Junior Member
Join Date: Sep 2013
Posts: 6
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Quote:
Originally Posted by MoCoTom
The thing that baffles me about the moisture diagnosis is the 02 sensors are mounted in the "TOP" of the pipe that connects the Banks header to the existing exhaust system. They are in the top aren't they
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Yes they are.
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