STRONG Exhaust Fumes. Cure? -
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post #1 of 6 Old 08-24-2019, 09:08 AM Thread Starter
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STRONG Exhaust Fumes. Cure?

I recently bought an ‘89 Islander that is in really good shape, with only 108,000 miles on it.... There’s no rust on the frame or floorboards, and there’s only very minor rust anywhere else on the body- with none of it having gone through any of the sheet metal. I don’t know where it would be coming in from, as I’ve put new seals on all of the doors, including the tailgate. It runs well, but when I drive it- the exhaust fumes drive me bananas after about 10 minutes.The exhaust manifold looks brand new and doesn’t sound like it’s leaking- and none of the bolts are loose anywhere on the system. I don’t see smoke coming from the tailpipe, but the fumes are excessive. Could it be running a little rich? I had a TJ and a JK for a while but this is my first Jeep after owning a couple of Rams for the past 8 years. Is this exhaust thing just something I’m gonna have to get used to with the YJ? It has the 4.2L inline 6. Most of the bolt on parts have been replaced in the past year, as the engine was recently rebuilt, along with the 5 speed transmission. Anyone know of a quick fix or have a diagnosis of what may be a common problem with this particular Wrangler incarnation? I love this Jeep, otherwise, but it’s not much fun to drive it for more than a few miles.

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post #2 of 6 Old 08-26-2019, 01:24 PM
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1992 YJ Wrangler 
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I'm curious about this one too. Have a 92 with the 2.5 and I can tell how it's running by the flavor of the exhaust fumes!..... There's no Cat, so I'm thinking the joints where it was or the random filler pipe is a different diameter. I'm gonna add some muffler repair goop and re-secure them with an impact driver Maybe it has to do with the last header stud missing/broken off.
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post #3 of 6 Old 08-26-2019, 01:42 PM
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Ya... it has to do with both the missing cat and the broken stud at the block

Stop whining about the 'ride' - If your YJ ain't wrangling your soul free, then might I suggest you buy a stationwagon... at least you can fit all your bull**** in the back.
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post #4 of 6 Old 08-26-2019, 04:53 PM
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1993 YJ Wrangler 
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My fume remedy for my 4.0 was adding a cat back into my exhaust. Which welcomed some quieter tones from my muffler. I still have a slight smell but that's probably because I'm running diesel engine oil with the high zinc content.
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post #5 of 6 Old 08-26-2019, 06:03 PM
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1995 YJ Wrangler 
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Does it have the stock design tailpipe? It should curve down at the end. When I bought my Wrangler the exhaust pointed straight back and had really bad fumes, I replaced it with the stock design and it is much better. The only time I smell it now is at a stoplight with the top off.
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post #6 of 6 Old 08-28-2019, 08:58 AM
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1987 YJ Wrangler 
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You should not have to live with it. Something is definitely wrong. Usually a leak can be identified pretty easily by black soot after a joint in the pipe. As mrit mentioned the exhaust will recirculate back into the jeep with certain tail pipe configurations.

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