Major exhaust smell in my 90 - Defender Source
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  #1  
Old May 28th, 2013, 08:21 AM
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Major exhaust smell in my 90

Hi. I have a exhaust smell inside my '95 ST d90. Could this be the reason - pic below? New Borla exhaust (installed by previous owner) doesn't extend past body. If so any advice on how to rectify at reasonable cost?

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  #2  
Old May 28th, 2013, 08:53 AM
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Exhaust usually means that the rear is not sealed against vapor intrusion. There is a big low pressure area that is created behind the vehicle as it moves, and exhaust gasses love to get up in this zone and pump inside the vehicle if the seals are bad around the tailgate. On a ST this is made worse by the loose fit of the top. Go around an be sure that it is fitting tightly.
The only other way it gets inside is by a hole in the floor and a leaking (loud) exhaust pipe.
The other solution is to roll up the sides so that the low pressure area is blown out.
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  #3  
Old May 28th, 2013, 08:55 AM
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The tip looks like it is extended just fine. Maybe there is a leak at one of the connection points between the y pipe and the tail pipe.

Clay
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  #4  
Old May 28th, 2013, 09:43 AM
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hi 02Bats. you mentioned "to roll up the sides". can you elaborate more on what this means? thaks
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  #5  
Old May 28th, 2013, 09:53 AM
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Is your top on or off when this happens? If off, then as Bill said, it is somewhat normal. That's why they call the drop curtain separating the passengers from the outside of the vehicle a fume curtain.

When he says roll up your sides he's talking about your rear side windows. Depending on your top you can either roll up your windows or zip them out.
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Old May 28th, 2013, 10:00 AM
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Ah, i see. It smells more or less the same with windows on or off. That variable doesn't seem to make a difference.
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  #7  
Old May 28th, 2013, 10:14 AM
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Brian Kandefer
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When you say windows are you talking about the rear one as well?
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  #8  
Old May 28th, 2013, 10:21 AM
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Quote:
Originally Posted by rijosho View Post
Is your top on or off when this happens? If off, then as Bill said, it is somewhat normal. That's why they call the drop curtain separating the passengers from the outside of the vehicle a fume curtain.

When he says roll up your sides he's talking about your rear side windows. Depending on your top you can either roll up your windows or zip them out.
Perhaps normal with the short Borla, but not normal with a standard length tailpipe.
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  #9  
Old May 28th, 2013, 10:34 AM
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I have a borla. When I took the back window out but left the sided on, the exhaust smell was terrible. All windows in or out and I didn't have an issue.
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  #10  
Old May 28th, 2013, 10:34 AM
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First off - I appreciate all the feedback. I need to do another test run in all the window on/off scenarios. When i remove the sides I also remove the back... and It still stinks. Perhaps not as bad as with all windos on, but still bad. When the sides and back windows are ON are on, it seems to be a little worse. To make matters more confusing, when all windows are on, on the back window i have a 2 inch gap between window and tailgate (the dreaded shrunken bestop).
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  #11  
Old May 28th, 2013, 11:08 AM
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hate to hi-jack, but could you post a cross section and full rear photo of your tire carrier...the angle has me curios.
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  #12  
Old May 28th, 2013, 11:30 AM
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Sure thing. Here are a few more pics. Hopefully they work - all I have handy right now.
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  #13  
Old May 28th, 2013, 11:32 AM
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Quote:
Originally Posted by ssi19 View Post
sure thing. Here are a few more pics. Hopefully they work - all i have handy right now.


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  #14  
Old May 28th, 2013, 03:43 PM
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Todd Kendrick
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I have a custom exhaust (similar angle) and I get the exhaust fume at certain speeds w/ the surrey; I run a surrey all summer long. Not enough to bother me but does happen at certain speeds/wind directions. In the winter I dont notice as much w/ the full top on...............
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  #15  
Old May 28th, 2013, 05:07 PM
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I had this issue when there was a small gap in the y-pipe. New pipe fixed the problem.
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  #16  
Old May 28th, 2013, 05:33 PM
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ok so it sounds like my short pipe likely isn't the prob (for once in my life - haha). i must have a hole/gap somewhere in the exhaust or the body. looks like i need to get under the truck and poke around a bit. I was afraid of that. This might be beyond my pay grade but will try....
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  #17  
Old May 28th, 2013, 08:14 PM
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Is there a simple method to diagnose/locate a gap in the exhaust pipe - for a weekend warrior like me? or do i need a mechanic / lift? Thanks
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  #18  
Old May 28th, 2013, 08:26 PM
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Quote:
Originally Posted by ssi19 View Post
Is there a simple method to diagnose/locate a gap in the exhaust pipe - for a weekend warrior like me? or do i need a mechanic / lift? Thanks
Visual inspection first for any pin holes, but I bet that the design of the Borla itself is a contributing factor as Barry and others have said. That said, with my old Borla I had an exhaust leak (in addition to a blown cat, old o2's, etc.) and decided to run some Sea Foam through the truck before I replaced everything (Borla had sent me a new cat-back exhaust to replace the old) and the exhaust leak spots to look for were immediately evident as the Sea Foam worked through the system. Not saying that's what you should do, but it made the leaks in the system very obvious to me.

See the below post from the Sea Foam thread with YouTube video showing the obvious leaks below the truck.

Quote:
Originally Posted by rijosho View Post
I picked up a gallon of the Seafoam / Sea Foam stuff over the weekend for my truck, and some 2 cycle engines.

Here's the video of start-up of the truck after sucking in about 6 ounces of the Seafoam through the vacuum on the brake master, and letting it sit about 12 minutes. You can see my nice exhaust leak ala muffler hole under the truck. Yes, I did this at an old abandoned Verizon lot, as you don't want an unnecessary call made to the Fire Dept!

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  #19  
Old May 31st, 2013, 02:19 PM
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I got under her. I noticed this area was leaking some water (a drip every 2-3 seconds). This is right behind the borla muffler. When my friend covered the exhaust pipe it hissed a lot and expelled more water. I tried to tighten the clamp a bit but water still leaking. Could this be the exhaust leak location? (Or is it here by design - a weep hole)?

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  #20  
Old May 31st, 2013, 02:39 PM
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The water dripping out and the fact that the engine didn't die when the exhaust outlet was plugged confirms that you have a leak. The water is condensation.
Yes you must get that sorted out.
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