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Old 05-14-2013, 07:27 PM   #1
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Exhaust fume question....

When I have my back window out or back and side widows out, my exhaust fumes come in through the back and into the passenger area. Someone told me it had to do with my sensors, that it was running too rich. Any ideas?

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Old 05-15-2013, 07:17 AM   #2
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I had that with my tj and now my yj. Stock exhaust on both. It's kind of a jeep thing. Lol. I get it less now with my turn down on...

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Old 05-15-2013, 11:48 AM   #3
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no, its not rich... its the idea that the exhaust comes out the back. You have a negative pressure with the rear stuff open pulling in fumes.

Two things to help, open your front windows or remove them whenever the back is open. The fumes will still come upward but will leave out the sides.

Secondly, if you open your vent for the cowl to bring fresh air in the dash, it helps a little bit.

Its just the nature of the beast, like running a pickup w/a topper and the hatch open for the tailgate. It will pull in the fumes... they do that from the negative air pressure. Your better off removing the doors but keeping the back shut. Or, opening all of it up at once.
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Old 05-15-2013, 12:42 PM   #4
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Quote:
Originally Posted by sevenservices View Post
no, its not rich... its the idea that the exhaust comes out the back. You have a negative pressure with the rear stuff open pulling in fumes.

Two things to help, open your front windows or remove them whenever the back is open. The fumes will still come upward but will leave out the sides.

Secondly, if you open your vent for the cowl to bring fresh air in the dash, it helps a little bit.

Its just the nature of the beast, like running a pickup w/a topper and the hatch open for the tailgate. It will pull in the fumes... they do that from the negative air pressure. Your better off removing the doors but keeping the back shut. Or, opening all of it up at once.
Okay yeah, I've done all that. Just wondered if it was all I could do. Thanks!
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Old 05-15-2013, 02:47 PM   #5
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Turning your exhaust to exit out of the side more behind the tire vs straight out the back makes a big difference also
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Old 05-15-2013, 04:17 PM   #6
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i saw a thread once where someone extended their tailpipe 3-4 inches past the rear bumper of their jeep to eliminate this, not exactly something i would do to my jeep, but supposedly it solved the problem
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Old 05-15-2013, 04:21 PM   #7
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Interesting... I've got straight pipes out the back of my Chevy Van, it does the same thing w/the back windows open. If I open the front windows its eve worse as they pull the air from the back to the front... its horrible.

I've also seen where exhaust comes out the sides in front of the rear tires but due to the negative air pressure behind a vehicle, it still comes in. Back when I was running a soft top it leaked fumes in around the top of the tailgate, I used to keep a piece of foam back there to cover up the seem.
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Old 05-15-2013, 04:34 PM   #8
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Just drive topless and don't stop at stop lights problem sovled:P

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