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Old 09-22-2022, 07:35 PM   #1
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Exhaust leak into coach

So I have a 2005 coachman santara select 36 ft. I have the chevy 8.1l v8. My last trip out going up a grade my engine shifted into 2nd gear and I started getting exhaust into my coach, bad enough that it burned my eyes. So when I got home looked for exhaust leakes around manifolds and found non nor any soot. My pipe where it connects to the manifolds were loose so I changed the gaskets (donuts) . Today on my trip 150 miles of up and down grades and no problems then all of a sudden back to fumes. Any ideas?
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Old 09-22-2022, 08:33 PM   #2
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Hey Lucky Duck,

If this happens while moving, I don't think it comes from the exhaust manifold or near the front of the RV as I would think there is somewhat enough air flow to blow any fumes away even if you are in 2nd gear. I would look at the rest of the exhaust system, tail pipes and where fumes could possibly get into the coach.
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Old 09-22-2022, 11:26 PM   #3
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If you run with the roof vents open, that could create enough vacuum to suck exhaust in from just about any small opening. Any open windows and a wind coming from the right direction could also bring in exhaust.
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Old 09-23-2022, 12:11 AM   #4
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Crawl back under and check the donut gaskets again.


Did you replace the nuts & springs?
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Old 09-23-2022, 10:09 AM   #5
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Quote:
Originally Posted by Duner View Post
If you run with the roof vents open, that could create enough vacuum to suck exhaust in from just about any small opening. Any open windows and a wind coming from the right direction could also bring in exhaust.
We've found that to be very true. We keep all vents and windows closed tight while traveling.
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