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Old 04-21-2008, 08:29 AM   #1 (permalink)
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4runner exhaust through window

O.k. I know this question is super lame, but I thought I'd ask b4 spending the bucks on a new tailgate.....So there is no back window in my 4runner and the exhaust smell is really bad in the cab. how many of you guys have this problem when it is down? I'm just wondering if it is really the window or if it is coming through the fire wall or some other place.
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Old 04-21-2008, 08:38 AM   #2 (permalink)
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When I still had the hard top on my '85, I would get exhaust smell if the rear window was open more than a few inches at speed.
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Old 04-21-2008, 09:14 AM   #3 (permalink)
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Crack your side vent windows...it helps push air out the back.

If you have the rear window open, front windows open or not, there's a vacuum behind the rig at speed, and it sucks air in through the rear window.

Cracking the pass sliders helps get more air pressure in the cab (relative to outside). Turning your heater vent fan on helps, too.



Or..kick out your windshield!!!




As an interesting side note, this wasn't an issue with my wife's 97. Different aerodynamics.
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Old 04-21-2008, 09:15 AM   #4 (permalink)
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As an interesting side note, this wasn't an issue with my wife's 97. Different aerodynamics.
Maybe the wing/spoiler?
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Old 04-21-2008, 09:44 AM   #5 (permalink)
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If you have the rear window open, front windows open or not, there's a vacuum behind the rig at speed, and it sucks air in through the rear window.
My '85 factory manual agrees...
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Old 04-21-2008, 10:03 AM   #6 (permalink)
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a little wing on the back helps the new ones not have this problem.
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Old 04-21-2008, 10:17 AM   #7 (permalink)
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That's why I put a wing on mine made out of an aluminum door threshold. It allowed me to leave the rear window cracked w/o the fumes. It was a mod I read about on the intarweb and copied many years ago.

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Old 04-21-2008, 10:42 AM   #8 (permalink)
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That's why I put a wing on mine made out of an aluminum door threshold. It allowed me to leave the rear window cracked w/o the fumes. It was a mod I read about on the intarweb and copied many years ago.

How does that work at crawling speeds?
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Old 04-21-2008, 11:19 AM   #9 (permalink)
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yeah what about crawling speeds? It smells when I'm not driving also, any ideas on that.
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Old 04-21-2008, 02:15 PM   #10 (permalink)
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Do you have exhaust leaks other places in your exhaust system? My tailpipe is cut off immediately behind the muffler, and it's not too bad.
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Old 04-21-2008, 06:23 PM   #11 (permalink)
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I don't think so. It's a brand new exhaust all the way through. I think maybe my header might not be sealed all the way or I need to put some kind of sealer on where my cat bolts on( it just has a gaskets at the moment.
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