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Old 08-21-2014, 07:47 PM   #1
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Slight exhaust smell

When driving I get a slight exhaust smell on my 95' Warrior. I know there are issues with the 454's getting cracks and leaks from the headers. Any advice on what to check for to determine the cause. Just bought the motorhome and it has low miles....probably too low 29k.
Thanks! New member

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Old 08-22-2014, 04:17 AM   #2
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Make sure you have a good working CO detector and ventilation until you get that issue repaired. Where are you located? Maybe a local member can refer a good repair shop to diagnose and help you get it fixed.

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Old 08-22-2014, 06:00 AM   #3
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Originally Posted by RicksWarrior View Post
When driving I get a slight exhaust smell on my 95' Warrior. I know there are issues with the 454's getting cracks and leaks from the headers. Any advice on what to check for to determine the cause. Just bought the motorhome and it has low miles....probably too low 29k.
Thanks! New member
Gassers do indeed have a problem with cracked headers and/or broken header bolts. You'll have to climb underneath to inspect. On our motorhome, I can turn the front all the way one direction and climb in behind the tire to see.

Let's hope it's broken bolts rather than a cracked manifold. Even then, the broken bolts are hard to remove, and several more will probably break during the removal process. Douse generously with liquid wrench numerous times and allow to sit. It took a WH service center 2 days to get the all bolts out of ours.
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Old 08-22-2014, 08:49 PM   #4
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The 454 was notorious for cracked exhaust headers but it could also be a warped one as well. It might also be an exhaust leak but you would probably hear that.
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Old 08-23-2014, 03:18 PM   #5
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Exhaust smell is a SERIOUS safety issue and you have more than one issue if you smell it in the coach. The part you smell is not the issue but the carbon monoxide in these fumes is. CO is colorless, odorless and deadly. Your red cells will give up O2 to accept CO. Most certainly fix the issue with the leak and as most others have stated and from experience it is most likely a cracked exhaust manifold. When replacing I would use the copper gaskets (they will allow for some warpage that even new manifolds may have) used for race motors(available from sources such as Jegs and Summit,you will need to know if your ports are rectangular or round - check for availability from these vendors online).
The other issue I see is finding where these gasses are entering the passenger compartment. Even with the exhaust leak fixed this needs to be addressed. Not being familiar with your unit I can not give specifics on where to look, but look for openings in the firewall as well as where the seal around the engine cover extends into the passenger compartment as a starting point.
Have fun with your new to you unit and please post your fix as it may help others and it also drives me nuts wondering if I helped.
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Old 08-23-2014, 03:35 PM   #6
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Glad you're aboard. Like the other posters I would agree with the cracked broken exhaust manifold/header. Please get it fixed ASAP so we can continue to enjoy your company. Enjoy your adventures and be safe.
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Old 09-23-2014, 12:02 PM   #7
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Aside from where the exhaust smell is coming from, the wind can blow exhaust anywhere. You might have a bad seal in a window or your engine house cover. The engine cover clamps/tie downs could be loose or worn. When I first got my used RV I could smell gas, turns out that 2 of my 4 rubber straps were broken allowing the gas smell in from the engine. Once replaced, no more smell.
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Old 09-29-2014, 02:25 AM   #8
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Check the exhaust pipe nuts on the manifolds. These tend to get loose from the heat cycling and engine movement. I check them when I change the oil just to make sure they are tight.
If yours has smog pumps on the engine it is possible to have the exhaust go up the pipes that are screwed into the exhaust manifold and out the smog pumps if the pumps are bad.
Sometimes spraying some atf in the carb or air intake while the engine is running will help you locate the exhaust leaks as smoke will be visible.
If you can't locate it take it to a shop that has a smoke machine and they should be able to locate it easily.

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