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trailnYJ 10-22-2013 11:08 AM

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

TylerCJones 12-05-2013 10:07 PM

Mine doing the exact same thing for weeks and then quit for a month now started back

Que89YJ 12-06-2013 09:29 AM

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:

When you say you loose rpm does it drop to 0 and then come back?

pete1991YJ 12-06-2013 09:38 AM

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.

Que89YJ 12-06-2013 10:29 AM

Good call Pete.

pete1991YJ 12-06-2013 12:29 PM

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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