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Unread 10-22-2013, 11:08 AM   #1
trailnYJ
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Join Date: Jul 2012
Posts: 60
Cuts out then backfires?

I have been havering this problem to were I'll loose rpms even if I haven't changed how much I am on the gas pedal. It then kinda sputters then back fires. Now this doesn't really happen unless I'm on a 1/4 tank of gas or if I've been driving 1/2-2 hours on the freeway. It popped up a code for the AIS circuit? I was wondering if I can replace that or any other ideas on why this is happening!

95 YJ 2.5 4 banger with 4"rancho lift on top of 33x12.5/15

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Unread 12-05-2013, 10:07 PM   #2
TylerCJones
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1993 YJ Wrangler 
 
Join Date: Apr 2012
Location: Dallas, Georgia
Posts: 4
Mine doing the exact same thing for weeks and then quit for a month now started back
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Unread 12-06-2013, 09:29 AM   #3
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 13,693
AIS is not the usual fault for backfiring. You can try and clean the throttlebody and IAC for the AIS. This thread tells you how:
http://www.jeepforum.com/forum/f12/q...-body-1262267/

When you say you loose rpm does it drop to 0 and then come back?
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Unread 12-06-2013, 09:38 AM   #4
pete1991YJ
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1991 YJ Wrangler 
 
Join Date: Mar 2012
Location: Niagara Falls, NY
Posts: 1,617
Wondering if you got some water or condensate in the gas, you said it *only* happens when its down to 1/4 tank or you've been on the freeway for a while? Its the right time of year for water-related probs to happen, basically whenever the seasons changes.
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Unread 12-06-2013, 10:29 AM   #5
Que89YJ
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1989 YJ Wrangler 
 
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Location: Detroit, Michigan
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Good call Pete.
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Unread 12-06-2013, 12:29 PM   #6
pete1991YJ
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1991 YJ Wrangler 
 
Join Date: Mar 2012
Location: Niagara Falls, NY
Posts: 1,617
Thanks Que! its been a long time, but maybe it is a possibility. I think the OP should dump and drain his fuel tank and system, then replace with a few gallons of *fresh* gas and a bottle of gas-line-antifreeze. Then try and see if the symptoms happen again.
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